=================
DECEMBER 9, 1996
=================
Owl No shift
----------------
Day MACKAY, Fischer, Satogata #6 p32-33
---------------------------------
Chipmunk locations confirmed for AtR. Instrumentation crate
in 1000P (acnfec007 or cfe-wh1-instr) back up at 1300. Flags, BLMs,
and BPMs work on this FEC. Flag app was run and replicated.
Yinjection app modified and replicated.
Two timing events were missing from crossbar: FEBrequest &
FEBflatend. Brian Oerter is looking into this. Note: FEBbunch does
not exist according to Leif as of 1600. This means that there is a
cabling problem with crossbar.
Eve WEI, Dell, Brown, Satogata #6 p34-38
----------------------------------
1. worked on AGS data archiving; The missing ones on the minimum list
are ion charge state, atomic mass, radial loop setting, rf
frequency, and rf voltage. The most difficult one is the correct rf
voltage.
2. worked on RHIC data archiving (viewlog); A list of comments will be
sent to Laster/Clifford. A list of key parameters will be
determined after trivial bugs are fixed tomorrow.
3. Briefly tested various RHIC applications; BPM application has been
enhanced with difference orbit saving which enables the comparison
of actual and simulated difference orbits.
=================
DECEMBER 10, 1996
=================
Owl No shift
----------------
Day MACKAY, Fischer, Satogata #6 p39-39
---------------------------------
Timing confusion with crossbar has been resolved. The
FEBbunch event will be generetaed from 1004A, but is waiting on a
handshake from J Gould.
Startup starts the current transformer pet page with a
non-standard file from Pat's area. The following page works better:
/usr/controls/data/PetPages/BCM/readings.pet
Eve WEI, Dell, Satogata, Thompson #6 p40-44
-------------------------------------
1. Briefly tested various RHIC applications:
a) Beam Profile Monitor - replicated with new features of flag
analysis data saving for emittance evaluation (emit.out replaced
by time stamp). Works as desired;
b) Various problems occurred with the following applications:
Beam Position Monitor - can not save orbit;
Injection Control - can not do "save magnet and orbits"
Utilities, Transfer Matrix Calculator - not working proporly
c) The following applications can not be started from StartUp:
Beam Loss Monitor; Power Supplies.
2. Continue working on viewlog RHIC data archiving. Suggesting
shot-by-shot archiving of a more complete list (in addition to
vacuum and cryo), as well as more clean-ups.
=================
DECEMBER 11, 1996
=================
Owl No shift
----------------
Day MACKAY, Fischer, Tsoupas, Peggs, Trbojevic #6 p45-51
--------------------------------------------------
1. All applications tested in detail (see list on p48). There are
still a number of applications down.
2. Shot archive. Archiving possible with GPM (p50). Data written
into file.
3. Test of loss monitors in AGS not succesful.
Eve KEWISCH, Ahrens, Pilat #6 p52-56
------------------------------
Shift goal: test the power supply manager, turn power supplies
on and ramp to the design settings ("fred file")
The manager behaved flaky all evening until FEC009 died and
was rebooted. Thereafter, no problems.
All atr power supplies were switched on (except for the 4 and
8 degree bends) and ramped to the design values. Switching of the
christie ps were no problem.
The "turn all on" sequence does not handle async messages and
must be redesigned.
A new Save/Restore interface was implemented in start-up and
tested.
Other action items:
1) stdby-fault status of ps is reported as "undef"
2) design file values must be verified (talk to nick)
3) save/restore contains bug.
=================
DECEMBER 12, 1996
=================
Owl No shift
----------------
Day TRBOJEVIC, Connolly, Tepikian #6 p57-61
-------------------------------------
1. We tried to get signals from the loss monitors in the AGS tunnel.
We found out that there are very serious problems with the PET
asynchronous data collection. Crates
FEC007 and FEC019
have been up and down.
2. The flag program was brought up and tested.
3. A few useful tools were used. One of them, to check if the event
occurs on a specific FEC, is:
ecount acnfec007 42
4. Beam was accelerated for the RHIC cycle in the AGS and the G10
kicker was fired (with the bumps locked out). The next check is
the bump check when the kicker is locked as well as the septum.
Eve KEWISCH, Ahrens, Pilat #6 p62-62
------------------------------
1) fulvia verified and corrected the fred file (with nicks and steveTs
help).
2) manager reliability:
- used diffrent rpc library
- async problem: new flush buffer function avoids
death by dead messages. needs more debugging.
smita had to leave at 7:30.
=================
DECEMBER 13, 1996
=================
Owl No shift
----------------
Day TRBOJEVIC, Connolly, Tepikian #6 p62-68
-------------------------------------
[1] Message -- Tom Kern replaced WFG a ascvme050 crate.
[2] FEC019 went down at 10:16. L. Hoff found a bug in using "ecount".
[3] Using a simple pet page we found noise on the ULM16 BLM.
[4] We adjusted the timing in the integrater and scanned the
MADC values with a 100us clock over 1 sec and saw a loss at ULM14.
[5] There is a timing difference between the scanned values and
the setting in the integrator width.
Eve KEWISCH, Ahrens, Pilat, Wei, Brown, Mane, Van Asselt #6 p68-76
------------------------------------------------------------
1) Problems in the system software are understood, work-arounds are
available.
2) Power supply manager worked with heavy use for more than 1 hour
(still running)
3) 14 sets of initial optics files are in place.
4) Progress was made on the feb event electronics.
5) Beam/machine study with Au77 beam in AGS in preparation for RADON
longitudinal phase space reconstruction -- Mountain data is taken via
LabView of gold beam around AGS transition. The amount of phase switch
(d phi = 0.58 rad) together with ramp rate (dB/dt = 1.8 T/s) is used
to evaluate the rf voltage, and to calibrate the AGS console
reading. This information is important in accurately evaluate the
synchrotron oscillation period, and thus realistically reconstructing
the phase space motion. The AGS transition energy (user 1) is found to
be gamma=8.40. The console reading of rf voltage can not be directly
used (reading 400 kV vs. measured 228 kV at transition), and the time
calibration from AGST0 has been found not correct (see remark by Lief
A, t=0 corresponds to +335 ms). (study performed by V. Mane, J. Wei,
K. Brown, V. Van Asselt, L. Ahrens)
=================
DECEMBER 14, 1996
=================
Owl No shift
----------------
Day TRBOJEVIC, Connolly, Tepikian #6 p77-82
-------------------------------------
1) A problem of the MADC in the loss monitor was resolved! (see p78).
The integrator window shows the correct length 65 msec. The number of
the MADC channels was reduced to **FOUR**, instead of all groups (64).
Every reading during 100 usec was correct this time. Reading of 1
usec per scan.
2) Position of the loss monitors in the AGS tunnel are listed (see
p79). 3) The FLAG calibration plates were checked. 4) All systems
were brought up at the same time except the current in the magnets.
5) Confirmed that the TRANSFER MATRIX CALCULATOR program works
correctly!! 6) "ecount" program works fine now. It does not crash
the FEC. To see if an event arrives at a specific crate:
ecount crate event
eg
ecount acnfec007 42
Eve No shift
----------------
=================
DECEMBER 15, 1996
=================
Owl No shift
----------------
Day SATOGATA, Thompson, Mane, Ahrens, Tanaka #6 p82-101
------------------------------------------------
[1] Sanki and Leif set up bumps and kicker timing for extraction on
user 2 flattop. There are several relevant important notes:
(*) FEBRequest and FEBbunch are firing every user 1 cycle
(i.e. every normal AGS cycle) for systems diagnosis
and checkout. These can be easily turned off by the OC
under "Spreadsheet Set CLD events, AGS real time."
(*) If FEBRequest and FEBbunch are turned on for user 2, the
KICKER AND EXTRACTION BUMPS WILL FIRE. These events
should be moved away from activity by the OC when not
in use by commissioning crews.
[2] AGS wall current monitor mountain range plots were acquired during
user 2 flattop, approximately 50 ms before kicker
firing. (pp. 90-93) Radon transform (still an expert activity) and
beam measurements give a rough analysis of the extraction bunch
(p. 100):
(*) Bunch length: sigma_t ~= 16 ns
(*) Bunch momentum size: sigma_p/p ~= 1.6x10^-3
(*) Bunch intensity: ~= 1.0x10^8 ions
Radon also shows that coalescing is still unsatisfactory for BPM
and current monitor systems.
[3] A single loss monitor (ulm14, at AGS G19) showed unmistakable beam
losses during the user 1 slow extraction, correlating strongly
with beam presence and BLM high voltage state. (pp. 94-99) Data
flow from this BLM was demonstrated all the way up to BLM
application (p. 99). Loss monitors will require retiming when beam
arrives, but this is first demonstration of asynchronous data flow
from BLM to application.
[4] BPM application has timing and gain interface installed, to be
tested Monday day shift before replication. Calibration pulsers in
A Trailer have not yet been tested.
[5] /ride file system is full, due to a FEC process logging heavily to
subdirectories under /ride/ado/ADO/quench/acnfecq02. System cannot
be cleaned manually; requires offending quench process to be
killed.
Eve No shift
----------------
=================
DECEMBER 16, 1996
=================
Owl No shift
----------------
Day SATOGATA, Thompson, Mane, Ahrens, Tanaka, Wei #6 p102-116
-----------------------------------------------------
[1] Beam was demonstrated on the new H10 septum flag. (p. 103) Extraction
is reproducable and reasonably consistent. Though more work needs
to be done with radial loop and PUE calibration, Leif claims
that extraction systems are operational enough for ATR.
[2] blmMan (the loss monitor manager) cannot be started from StartUp and must
be started by a user logged into acnsun55, according to Don Shea.
The loss monitor application was started, and Pat re-timed the
integrators to see signals during user 2 extraction in [1].
[3] Radon studies continue, gathering more data on user 2 flattop. Discussions
began with Mike Brennan, and present Booster-AGS coalescing was
documented. Jie and Vibha are documenting RF and main magnet
parameters in the AGS over cycle 2 for Radon analysis.
[4] /ride file system was restored to 200 Mb full approximately 10 AM. Tom
Clifford claims that Tom Wild is responsible party; Fritz D is
working coordinating efforts to avoid this problem again.
Eve No shift
----------------
=================
DECEMBER 17, 1996
=================
Owl No shift
----------------
Day SATOGATA, Thompson, Mane, Ahrens, Tanaka, Wei #6 p116-125
-----------------------------------------------------
[1] EXTRACTION: Timing work on bumps resulted in extraction setup that
can deliver, with appropriate RF conditions, two extracted
bunches in one AGS cycle.
[2] BLM STUDIES: BLM application and manager are still having
robustness problems. '95 ATR timing was loaded and, using a
pet page, clear loss signals were seen at the septum when FEB
extraction was fired, timing off of FEBbunch. Data was also
taken showing two-bunch extraction mentioned in [1].
[3] BPM SETUP: BPM systems were set up with nominal ATR timing as last
year, and non-beam triggered acquisition on the user 1 cycle
was seen from all channels. Triggers have been left on to
probe orbit manager for high-data rate memory leaks. Delay
module aliases were installed into
/ride/config/adoaliases. Gains set to +20 db, but remain to be
checked with calibration pulsers.
[4] RADON STUDIES (from Jie): Beam/machine study with Au+77 beam in
AGS ATR/Sextant cycle (User 2) to test RADON longitudinal
phase space reconstruction, and to evaluate longitudinal bunch
size. Various timings in AGS User2 have been calibrated:
Booster cogging_arm_rf 33ms after AGS T0
AGS rf voltage reading origin 217ms " " "
transition 1100ms " " "
The AGS transition energy is found to be gamma_t=8.49. With
the known ramp rate (dB/dt=2.0 T/s) and synchronous phase
(0.58 rad) evaluated at transition, the actual rf voltage is
found to be about 72% of the console "scaler voltage"
reading. With these information, RADON has been used to
reconstruct longitudinal phase space at User 2 extraction.
The evaluated bunch parameters at AGS user 2 extraction are:
sigma(t) = 8.3 +/- 1 ns
sigma(p) = 7.8 +/- 1 x 10^-4
S (95% bunch area) = 1.4 +/- 0.3 eV s/u
intensity 1.0 x 10^8 ions/bunch
Eve No shift
----------------
=================
DECEMBER 18, 1996
=================
Owl No shift
----------------
Day WEI, Dell, Mane, Tsoupas #6 p126-140
--------------------------------
1. RADON application: Error sensitivity study shows that RADON
longitudinal phase space reconstruction requires an accurate
knowledge of synchrotron oscillation period (at 5% level).
The instruction for running RADON is posted in logbook 6,
p. 132-136.
2. EMIT application: The instruction for running EMIT for transverse
emittance measurement using U-line flags is posted in log book 6,
p. 137.
3. AGS shot archive: The instruction for AGS shot archive has been
posted in logbook 6, p. 50. Missing information includes AGS
current transformer reading, charge state, atomic weight, rf
voltage, and radial loop function. Further work will be done to
pass AGS cycle number to RHIC applications.
4. Viewlog application: Cryo information up to 12/16/96 is now
available. Vacuum data is partially available for 12/17/96 and
12/18/96. Viewlog will be replicated in a day while further worked
on by J. Laster to include maximum and minimum values etc.
Eve No shift
----------------
=================
DECEMBER 19, 1996
=================
Owl No shift
----------------
Day WEI, Dell #6 p140- #7 p4
-----------------
Viewlog application testing and development ---
The newly replicated application includes Utility, Cryo, and Vacuum:
1. Utility includes utility box temperature of 16 crates, all data
logged up to the current time. All but util.007 (showing a constant
73.0 degree) are credible.
2. Cryo contains cryogenics data of 60 entries, all logged up to the
current time. Displacement data of YO4-CRT6 and two DU3 are
expected to be available on 12/20/96.
3. Vacuum status including W-line, X-line, and Y-line ion pump and
CCG gauge pressure is logged properly reflecting PET page values.
Information on U-line is not available due to data transfer
problem. Information on the sextant is expected to be available in
1 to 2 days.
Eve No shift
----------------
=================
DECEMBER 20, 1996
=================
Owl No shift
----------------
Day WEI, Dell, Mane #7 p5-28
-----------------------
1. Viewlog application development for RHIC data logging --
Vacuum data (ion pump and CCG pressure) for all AtR lines (U, V, W,
X and Y line) and the sextant have been logged. Viewlog reported
ion pumps working for all AtR units except for xip5 and yip5, and
for sextant units YO5-IP-PW7.1 and YO5-IP-PW7.2 at pressure level
of 10^-9 to 10^-8 Torr.
Cryogenics data logged includes all but 4 recooler outlet
temperature reflecting room temperature before coll
down. Displacements data for YO4-CQT6 magnet and two DU3 dummies
are all logged, with an agreement with expected values between 1
and 5 mils.
Utility data including 16 crate utility box temperature are
continue to be logged. A reading of constant 73.0C for FEC007 is
reported to be caused by a faulty thermal sensor.
2. Radon application development for longitudinal phase space
reconstruction --
Various timing values have been recalibrated for AGS User 2 (for
sextant test) to reflect the recent change in rf program. The new
timings are:
Booster Cogging_Arm_RF: 27 ms from AGS t0
AGS transition: 1587 ms from AGS t0
More mountain data have been collected for Radon testing.
Eve No shift
----------------
=================
DECEMBER 22, 1996
=================
Owl No shift
----------------
Day KEWISCH, Pilat #7, p29-35
----------------------
1) Conclusion: The measurement of Resistance and Inductance [of power
supply/magnet circuits] works but involves many manual steps. The
analysis of the data will be done off-line.
2) All PS ramped to 98% of maximum. "utv2.2" tripped at 80%.
3) "Wireup" database corrected.
Eve No shift
----------------
===============
JANUARY 6, 1997
===============
Owl No shift
----------------
Day WEI, Dell, Brown, Mane #7 p38-54
------------------------------
1. RHIC data logging by ViewLog: Data logging over the past four
days indicates a displacement of about 7 mils transversely on
YO4-CQT6 and longitudinally on YO5-DU3, which is correlated to
magnet loop pressure change of about 16 PSIA. Further effort
is made to build tree structure (regrigerator, valve box, recooler)
in the cryogenics branch.
2. AGS shot archiving: Now the shot archiving includes long desired
information including charge state, atomic mass, rf voltage
(scaler), rf frequency, radial loop reading, along with B field,
AGS extraction kicker G10, Bump G9, H11 readings, and cycle number.
The time of logging is set to 2200 ms after AGSt0 (current
FEBrequest).
3. RADON longitudinal beam tomography: Various timing is done once
again, and data is taken over the whole AGS cycle to evaluate
the longitudinal bunch emittance growth.
4. G09B bump is down and being worked on.
Eve No shift
----------------
================
JANUARY 10, 1997
================
Owl No shift
----------------
Day MACKAY et al
--------------------
No summary.
Eve WEI, Dell, Brown, Ahrens #7 p60-p76
--------------------------------
1. Main Progress: Gold beam extracted from AGS, steered down the
U-line passing 8 degree bend, showing up on flag uf3.
2. AGS extraction: Nicely shaped gold bunch of 20ns full width, at
intensity of about 5x10^7, were extracted from AGS. The position of
the flag image on u-line uf1 was centered by adjusting H10 septum
current. The timing between FEBrequest and FEBbunch is 28ms
(compared with last year's 31ms).
3. With the dead-reckoned current in the U-line, the beam image shows
up on the first 3 flags (uf1, uf2, uf3), though not centered. At
the first shot, current transformer recorded 3.2x10^7 particles,
and beam loss monitor is also showing high loss readings. The
starting current file is fred-90-80.
4. Lattice tuning: With tuned H10 current, the beam is centered
horizontally on uf1; with tuned 4 degree arc, the beam is also
centered on both uf2 and uf3. The beam is nearly centered
vertically by adjusted trims tv1, tv2.2, and tv3.
5. Problems occurred:
a) PS page "maxLevelS" was not set to "Bits" -- fixed;
b) AGS septum and kicker were having non-hardware problems, septum
current was set wrong -- fixed;
c) 8 degree and 20 degree PS were left at local -- fixed;
d) FEC007 computer was down -- rebooted and fixed;
e) Flag application was complaining insufficient memory when one
hits "Ctr D" to retrive other flag images other than the last one
-- not fixed, occurred from time to time;
f) Vacuum valves at WSV6, WSV7 and the two in Y line still closed
-- not fixed, MCR doesn't know how;
g) Flag application complained "failed to fit a Gaussian" even with
a decent profile.
6. Manu: Various start-up instructions were indexed on the second page
of Log Book #6 and #7.
================
JANUARY 11, 1997
================
Owl SATOGATA, Mane, Thompson, Tom Shea #7 p77-p90
------------------------------------------
1. Main Progress: Gold beam delivered through W-line to W-line
flags. All instrumentation except BPMs is working. 4-degree and
8-degree bends scanned.
2. Intensities vary from 1.0 to 4.0x10^7 ions delivered by the
AGS. These are intentionally being kept low by the AGS while tuning
is being performed.
3. Tuning: Hysteresis runs are necessary. Hysteresis run on 8-degree
bend at beginning of last shift practically delivered beam
immediately to W-line. Small vertical adjustments and tuning
delivered beam to W-line flags.
4. Beam loss monitors at ulm6 (8 degree bend) are correlated to beam
presence, but heavily saturated. Scans of 4-degree and 8-degree
bends were unable to bring these loss levels down.
5. Problems:
a) BPM system is still problematic. Manager problems are being
worked on by Todd, and cables for railed BPM planes (ubh2, ubh6,
ubh8, ubv4, ubv8) will be checked. acnfec019 was rebooted at
1:20 to work around a known bug in reloading BPM ADO's. BPM
configurations were also fixed.
b) Vacuum valves WSV6 and WSV7 are still not open; beam still
appears, though widely dispersed, on flags wf1-3.
c) Flag profiles still show interlacing problems (pp. 78-9). It is
also unclear whether to believe positions as given by 2d graphs,
or by flag axis marks. Many times these differ by several mm!
Day MACKAY, Fischer, Tsoupas #7 p91-p97
--------------------------------
Had beam at wf3. Sector valves wsv6 and wsv7 were left in. We has a
vacuum dude come in to fix this since the target desk didn't know the
password. Major problems with U-line BLMs. There are probably losses
at the front end, but we were unable to tune the line with faulty
hardware/software (BLM).
Eve WEI, Dell, Brown, Satogata #7 p97-p123
----------------------------------
1. Main Progress: Gold beam has been steered down to the end of ATR
dump, using either the first (uf1) or the second (uf2) flag as
striping foil.
2. An orbit (PS file Jan.11.96.owl) has been established to steer the
beam to the ATR dump with uf1 as striping foil, and with uf2 out.
A second orbit (PS file Jan.11.97.23:10) has been established to
steer the beam to the ATR dump, with uf1 out. For both orbits, beam
images show up on all U and W line flags.
3. Both uf1 and uf2 have been shown to significantly change the
momentum of the beam, in addition to striping. Tuning with/without
these flags must take the momentum shift into account (known from
last year's study).
4. BPM application is partially working, agreeing with flag image
readings.
5. AGS extraction condition has been completely archived (p. 105 -
109, #7). Shot archiving program is further improved on rf
frequency reporting.
6. RHIC data archiving continuing, with data over the past 16 days
showing sextant vacuum conditions (YO5-ip-pw7.1, pw7.2, pw9.1,
pw9.2 at 10^-9 torr level).
7. Problems:
a) Both AGS bumps were down, several times;
b) Flag application: both frame grabber 3 and 4 are have problems
-- not fixed
c) Magnet manager was down three times; restarted;
d) BPM manager was down twice, reportedly fixed;
e) Power supply pswq2 was tripped, soon brought back.
f) Current transformer application was not working.
g) Flag wf2 shows "middle" when put in.
h) RHIC archiving: crate temperature high (~ 55 C) on fec007 and
fec013.
================
JANUARY 12, 1997
================
Owl SATOGATA, Mane, Thompson #7 p124-p138
--------------------------------
1. Main Progress: U-line completely tuned with uf2 flag as stripping
foil, giving near-100% transmission to current transformer uxf3, no
losses, and a flat orbit. W-line still needs tuning and
flattening. These are stored in the 'Jan.12.97.07:43' magnet save
file.
2. Dave Gassner and John Donahue tune AGS extraction intensity through
the night, wiht clear indications of improvement. (p. 126) Early
morning extraction intensities rose to 7.5x10^7 ions/bunch through
the U-line.
3. Mountain-range data acquisition was set up for longitudinal
emittance measurements; synchrotron period at extraction was
measured to be 8.2 ms. Setup encountered scope problems and AGS
vacuum problems; measurements are planned for tomorrow night's owl
shift.
4. BPMs were showing good data early in the evening, though later they
began to fail again. BPM manager dies every 32 acquired
orbits. Timing will be checked again later on in day on Sunday
shift. A difference orbit using uth2 was generated (p. 136). This
can be compared directly to TransMat.
5. Loss monitors and current transformers were restored to operation by
following two setup files listed at the bottom of p. 124. Current monitor
noise was measured at ~5x10^6 ions/bunch. Only main beam losses are very
near the end of the W-line.
6. Problems:
a) BPM Manager dies after 32 acquired orbits; no way to reattach
running OrbitDisplay application to newly started BPM manager.
b) BPMs are still giving underflow and triggering errors even with
strong beam intensity. Some bpms (e.g. utv8) are never working
properly, and marked to be checked by instrumentation personnel.
c) OrbitDisplay dies occasionally when generating difference orbits.
d) Frame grabbers 3 and 4 continue to be problems; intermittently
working.
Day MACKAY, Fischer, Tsoupas, (Thompson, Satogata) #7 p138-p148
------------------------------------------------------
1) Tuned line for lower losses. Archived settings saved in
"Jan11.97.01:45" <-(pm)
2) All current transformers were working. wxf1 may need to be timed
in a little better.
3) We need to check magnet bends versus transfer matrix. Possible
problem with scale factors?
4) New version of bl-steer which can change ubegin vector.
Eve KEWISCH, Ahrens, Pilat, Satogata #7 p149-#8 p3
----------------------------------------
goals: 1) calibration of flag uf3 to center of quadrupole uq12.
2) trouble shooting wtv6.
3) prediction vs. measurement of difference orbits.
4) calibration of the current transformers.
accomplished:
1) the flag uf3 is vertically about 10 mm off center
relative to uq12. the measurement of the horizontal
misalignment is inconsistent.
2) the wtv6 power supply was changed before any testing could
be done.
3) bcms show 70% beam loss between the 1st and 2nd bcm. blm do
not work and are necessary to confirm the loss.
4) bpms in w-line not responding for most of the shift.
difference orbit measurement was not tried.
================
JANUARY 13, 1997
================
Owl SATOGATA, Mane, Thompson #8 p4-p22
--------------------------------
1. Main Progress: Nearly 100% transmission through ATR achiveved with
minimal losses, repeatably showing 8x10^7 ions on all current
transformers. Diff orbs with BPMs appear to indicate old
factor-of-two turn problem in U-line dipole correctors
(pp. 9-11). Longitudinal bunch size (95% bunch area) is 0.3
eV-sec/nucleon, with a single 12-to-6 coalescing in AGS.
2. Extraction: extraction remained quite consistent, with perhaps 20%
failure rates on extraction bumps. Beam placement on H10 flag
checked and correct. Delivered beam intensities were consistent at
7-8x10^8. Current transformer wf3 was timed in correctly (pp. 16-17).
3. Mountain-range data acquisition was set up for longitudinal
emittance measurements; additional data was taken, and the previous
night's data was analyzed to give 95% bunch area of 0.3
eV-sec/nucleon. We anticipate that Mike Brennan's coalescing
efforts will raise this value.
4. A new BPM application was replicated, allowing for simulated
difference orbits given a single dipole corrector setting.
Difference orbits were compared to measured difference orbits for
utv1 and uth2, apparently showing that dipole correctors are a
factor of two stronger than we intend them to be -- is this the old
dipole corrector turn problem? Transmat and simulation are
consistent with each other.
5. BPM system timings were checked, although some BPMs (e.g. ub8) are
still not showing good data. These will be discussed with Tom
Shea. At these intensities, BPM plate voltages are >100 mV, and
signal is very clean. BPM Timing is characterized on p. 18.
6. Problems:
a) OrbitDisplay dies occasionally when generating difference
orbits.
b) BPMs are still giving underflown and triggering errors even with
strong beam intensity. Some bpms (e.g. utv8) are never working
properly, and marked to be checked by instrumentation personnel.
c) Frame grabbers 3 and 4 continue to be problems; intermittently
working (p. 4)
d) acnfec007 had to be rebooted when it slowed and became
unpingable (p 6)
e) Some flags show large beam offsets even with 100% transmission
efficiency
Day TRBOJEVIC, Connolly, Tepikian #8 p23-27
-------------------------------------
1) The BPM signals from the U line were not coming out, half of the
shift
2) We set the beam at the end of the W line at the quad WQ5 correctly
(used WPS2 from 381.787 A down 373 A). The beam position on WF3
has not changed at three WQ5 currents: 194 A, 175 A, and 150 A.
3) We found out that the beam was off site on the WF1 flag!! We found
that even on UQ5 (upstream) the beam was off the center of the quad.
| WE REALIZED THAT THE WHOLE BEAM LINE HAS THE BEAM GOING OFF THE
| CENTERS OF THE QUADS.
4) Started to "tune" the beamline from the UF2 flag. We found that
the UQ5 shows the beam off the center of the quad.
5) At 1:30 pm the AGS is down.
Eve KEWISCH, Pilat, Ahrens #8 p28-30
------------------------------
No beam until 11:30 pm.
Corrected u-line trim transfer function and verified beam deflection.
================
JANUARY 14, 1997
================
Owl WEI, Dell #8 p31-39
-----------------
1. Main Progress: The transmission efficiency of u-line reach 100%,
and the efficiency in u+w line reaches 90% (PS file
Jan.14.97.08:00), achieved by tuning vertically the elements utv4,
utv7, wp1, wp2.
2. Tuning: After the change in PS database, an earlier file with 30%
transmission was used to start tuning. 100% u-line (uxf3/uxf1) was
achieved by adjusting utv4 strength. 90% u+w (wxf1/uxf1)
transmission was achieved by adjusting utv7, wp1, and wp2 strength.
3. After tuning, vertical center readings of all u and w line flags
are within 3mm from flag origins.
4. Tuning was preliminarily done with 3 current transformer readings,
u-line loss monitor, and u+w flags.
5. Problems:
a) BPM not working properly (e.g. ubv7 not responding like uf3 on
trim);
b) w-line loss monitors not working properly (e.g. when u-line
transmission is 100% but w-line 10%, w-line BLM not recording
loss);
c) Flag centroid reading often does not agree with center reading
(center reading is ok);
d) Magnet manager and application were hung many times -- fixed by
killing the manager on acnsun16 and restart manager;
e) BPM applications often dies after a certain time period;
f) Frame grabber 3 and 4 of flag application not working.
6. Typical u-line BLM reading recorded for various cases including
uf2 in and 100% transmission (uf1 out), both uf2 and uf1 out,
high u-line loss, etc.
7. 8 degree bend dipole strength scanned against transmission
efficiency and uf3 position readings.
Day TRBOJEVIC, Tepikian, Connolly, Mackay #8 p40-41
---------------------------------------------
Day shift had problems with BLM application early in the day.
SUMMARY: Did some fault studies -
1) warc20 appears to be a good critical device for RHIC running.
2) With final RHIC intensities, the survey shaft by wp1 may give
levels of ~250 mrem/hr. Either the berm will have to be swept or
the survey shaft will need to be covered.
Half of the required fault studies have been completed. Try again
tomorrow.
Eve KEWISCH, Pilat, Ahrens #8 p42-50
------------------------------
1. Double ejection: septum fails to recharge, technician called.
2. BPMs: problems with trigger at low intesity, no useful measurement
possible.
3. Emittance measurement successful, emittance imaginary.
4. flag uf3 alignment measurement to be continued. (injection
p.s. problems in ags)
================
JANUARY 15, 1997
================
Owl WEI, Dell, Brown #8 p52-70
------------------------
1. Main Progress: Both U and W line are tuned with the beam going
through approximately the center of all the flags. The lattice
(PS file Jan.15.97.04:20) is suitable for emittance measurement.
Momentum aperture scan and dispersion measurement are done on
AGS extraction, U and W lines.
2. Tuning: The ATR line was tuned with the beam going through the
center of all (except uf5 H) flags. The u line transmission is
100%. W line transmission is above 90%. The lattice is adequate for
emittance measurement use.
3. Momentum aperture scan: The momentum aperture of AGS, U, and W
lines were scanned by changing AGS radial orbit position, while
simultaneously recording AGS rf frequency, current, U and W line
current transformer readings, and center positions on all the u and
w line flags. BPM positions are archived for each orbit. Loss
monitor readings are logged in the logbook for each orbit
also. Further analysis will yield momentum aperture.
4. Dispersion measurement: The dispersion at all flag locations will
be available after aperture scanning data being
processed. Dispersion at BPM locations is unknown, depending on
analysis of archived BPM data.
5. Reproducibility study: Repeatibility of beam positions and
intensity at ATR entrance were studied by recording uf2 position,
AGS shot current, and uxf1, uxf3, wxf1 current readings for 9
different AGS orbits.
6. Emittance measurement preparation: attempted to archive data for
emittance evaluation using EMIT.
7. Problems:
a) FEC009 was down, rebooted, and PS restarted;
b) AGS L20 septum was down;
c) Current transformer uxf1, uxf3 were broken - fixed by Pat;
d) Loss monitor application were down - restarted manager;
e) pswq1 PS was on Stby-Fault - reset easily;
f) Flag application will die if EMIT was set on for two flags. It
would be highly desirable if 1-D fit Gaussion could also be
shown along with actual profile, and if EMIT saving could be
activated only after the flag image is checked to be acceptable.
Day TRBOJEVIC, Tepikian, Connolly #8 p71-72
-------------------------------------
1) We tried (Roger Connolly) to get the IPM working (detailed report
will follow).
2) The magnet file from the previous shift showed high losses in both
the U and the W lines. We reloaded the file Jan.14.97.12:27 which
has low losses but is not in the center of the flags.
3) We found that the previous settings UQ9 beam was off the center.
Eve MACKAY, Tsoupas, Fischer #8 p73-85
--------------------------------
1) Had beam to dump with multiple extraction (2 pulses per AGS cycle).
2) Took uf2 position data while scanning quads uq1->5 for offline
analysis.
3) BLM application has some inconsistencies for can-to-signal
assignments. Some signals, eg "ylm8", seem to be missing.
4) Transverse emittance measurements e^N_95 = 10x10^(-6) [m].
5) Found bug in Yinjection App. Has been fixed but not replicated.
Works for vertical bumps. Hard to prove for horizontal due to AGS
extraction wobble.
6) Had 1.3x10^8 ions extracted in a single bunch.
================
JANUARY 16, 1997
================
Owl WEI, Dell, Brown #8 p86-107
------------------------
1. Main progress: Transverse emittance, measured with AGS IPM to be
about 10 mm mr, agrees with that measured in the U
line. Lattice functions, evaluated for all the u and w line flag
locations, agree with design values at 20% level. Momentum
aperture dispersion scan done for both u and w line with fixed
AGS extraction condition.
2. Emittance measurement: With IPM in AGS, the measured emittances are
Ex = 10.1 +/- 0.7 mm mr
Ey = 9.6 +/- 0.9 mm mr (normalized 95%)
agreeing with that measured in the U line with flags uf3, uf4, uf5.
3. Beta function measurement: Using all 8 u and w line flags, tuned to
avoid saturation, the beta functions at flag locations are obtained.
Comparing with the design values, the deviations are:
D(beta)/beta (x) = 0.1 +/- 0.3
D(beta)/beta (y) = 0.2 +/- 0.5.
4. Momentum aperture: With fixed AGS extraction, the momentum
apertures are obtained as:
A (u-line) = 2.9 %
A (w-line) = 1.2 %
(Gamma acceptance: 12.15 +/- 0.18 (u-line); 12.15 +/- 0.07 (w-line))
5. Line dispersion: 14 orbits are taken for u and w lines, with fixed
AGS extraction, recording simultaneously loss monitor reading, BPM
archiving, all flag centers, and all u+w current transformer and
AGS extraction current readings. Data to be processed.
6. Lattice comparison: Lattice (Jan.14.97.14:07) is found to have a
transmission of 100 +/- 3%. However, since flags (e.g. uf5) can be
off scale, caution should be taken when using it for emittance
measurement. Lattice (Jan.15.97:04:20) has all flags
centered. However the transmission is 92 +/- 3%. The loss is at 20
degree bend, possibly caused by mis-centered uf5.
7. Flag uf5 is suspected to be off center vertically by -1 cm, based
on deviation from BPM reading and loss monitor tuning.
8. U-line BPMs are all working, with difference orbits within 1 mm
from what predicted by design model. W-line BPMs are not working.
9. Problems:
a) Sigma reading from fitted Gaussian of the flag application seems
not reliable. E.g., uf5 sigma(x) and sigma(y) suspected exchanged.
b) PS pswp1, pswp2, pswq2 tripped and reset.
c) PS application stoped several times for no obvious reason;
manager restarted each time.
Day SATOGATA, Thompson, Mane, cast of thousands #8 p108-117
---------------------------------------------------
1. IPM: Background subtraction and comparisons attempted with no
conclusive results. Attempt to switch polarity of power supply
showed no appreciable changes.
2. Intensity and RF Tuning/Maintainence: Tandem tuning, a new foil,
peaker tweaking, and BTA tuning have given reliable intensities of
9-10x10^7 ions for the majority of the morning shift.
3. BPM Update: BPM problems in W-line diagnosed as a configuration
problem. These will be fixed early in evening shift. BPM timing and
gains set up to produce reliable triggering and readbacks for
intensities above 8x10^8 ions. Intensities as reported by BPMs
appear to scale quite well from shot to shot (p. 113)
4. RF had the beam for an AGS RF module replacement from 1130 to
1300. Further RF repair and returning continued to 1400. Fault
studies began at 1430 and continued to well beyond end of shift.
5. Problems:
a. BPM configuration in W-line is incorrect for channels wbv2,
wbh2, wbv3, wbh3, wbh4. These will be fixed in the early evening
shift, and further BPM studies will commence.
b. Repeated AGS and RF tuning appeared to require retuning of the
AGS extraction kicker several times. This can be diagnosed using
the H10 flag (p. 113).
c. Some BLMs were apparently missing from the application
readbacks. These were fixed in consultation with Don Shea.
Eve MACKAY, Ahrens, Fischer, Tsoupas #8 p118-127
----------------------------------------
1) Todd made the BPMs work. They were running for the rest of the
shift.
2) Horizontal and vertical orbits flattened using the BPMs.
peak-to-peak horizontal ~ 7 mm
peak-to-peak vertical ~ 5 mm
Steering was done manually and with 4 bumps
3) Losses in Fig 2 p126 are due to the uf2 flag. One can see this by
taking uf2 out. The losses disappear but beam hits the 8 degree
bend dipoles.
4) Emittance was measured using uf3,4,5. See p123. Also a measure of
emittance blow up. See p123.
================
JANUARY 17, 1997
================
Owl KEWISCH, Ahrens, Pilat #8 p128-137
------------------------------
1) leif adjusted the kicker timing, changed the horizontal injection.
2) horizontal orbit correction using the BPMs
3) verified misalignment of uf3 and uf5 with bpms.
4) emittance measurement using wf1-3. ex = 9.4 pi, ey = 20.3 pi ???
5) emittance measurement using uf3-5, ex = 12, ey = 12.6.
6) tried to use w-arc dipols at nonimal tsrength, but orbit correction
does not work.
7) saved file as jan-97.07:30
8) leif reduced some of the vertical coherence at ags injection.
Day SATOGATA, Mane, Thompson, more of the cast of thousands #8 p138-149
---------------------------------------------------------------
1. Main Progress: Archived systematic orbit data for single-bunch and
multi-bunch extraction and saved to correlate with beam
current.
2. Extraction: Intensity has been erratic, ranging from 4 to 7x10^7.
RF work by Mike Brennan continues, with plans to attempt the
next stage of coalescing on Sunday evening. LTB and BTA tuning
must be watched closely by AGS operations to maintain high
intensity.
3. BPM status: Orbits were acquired for multiple-bunch extraction, and
appear to correlate well with FEB expectations.
4. Flags: Larry appeared to work on Flag timing, and it seems the
framegrabber 3/4 and interlacing problems are understood as
being caused by staggered acquisition timing.
5. Applications:
a) BCM no-beam offsets were placed into the current monitor ADOs
(p. 141).
b) New BLM app only displays new data when acquiring
continuously. Yaay!
Eve MACKAY, Fischer, Tsoupas, Satogata #8 p149
------------------------------------------
No useful measurements (some days you should just stay in bed).
Problems with Magnet Manager and missing event 42. The beam was
pretty erratic.
================
JANUARY 18, 1997
================
Owl KEWISCH, Ahrens, Pilat #8 p150- #9 p7
------------------------------
1) leif adjusted the kicker timing again and the positions on the h10
and uf1 flag are documented.
2) the magnet manager locks up frequently, when the global "doit"
function is used. last night the manager locked up only once during
the shift. It is documented that the manager hangs in the network
routines.
3) Through the rest of the night the BPMs produce "lies": orbits are
displayed when the beam is lost or not ejected from the ags,
positions dont chage when upstrem dipoles are changed
drastically. the bpms are useless.
4) the 60-80 optics is used: first a fresh start from the design file,
then including the "corrections" from the 90-80 optics. the beam is
lost in the w-arc.
5) the emittance is measured in the u-line using flags uf3, uf4 and uf5
ex = 11.5, ey = 11.4
6) multibunch extraction with 4 bunches is tested. the extracted
bunches seem to be spread horizontally. the bpms pick up all 4
bunches.
Day SATOGATA, Mane, Thompson #9 p7-9
--------------------------------
1) Safety sweeps and procedures aee done for the day.
2) 4 degree bend is back on: 8 degree bend still in local. Switch, X,
Y arcs are locked out.
3) Frankel says that tomorrows sweep check procedures shoud impact AtR
minimally.
4) BPMs, BLMs, BCMs should be working for evening shift.
Eve TRBOJEVIC, Connolly, Tepikian, Peggs #9 p10-13
--------------------------------------------
Got beam off IPM and saw good signal from electrons.
================
JANUARY 19, 1997
================
Owl No shift
----------------
Day No shift
----------------
Eve SATOGATA #9 p14
----------------
1) AGS down for user 2 for most of the day for fsiled RF module
replacement. Restored @ 1700.
2) All beam in AtR vanishes for 4-8 hours while Brennan tunes AGS RF
coalescing.
3) Magnets were left in state of Jan.17.97.07:30 to keep houses warm!
4) Left Orbit, Flag, & Loss Monitor apps up to test for stability.
================
JANUARY 20, 1997
================
Owl No shift
----------------
Day WEI, Dell, Brown #9 p15-23
------------------------
1. RHIC cool down and data archiving: RHIC cool down started. Viewlog
archive showed practical readings of Helium flow for refrigerator
and flow to load. Various vacuum readings (yo5-cc-pi8.2,
yo5-tc-pi8.2, etc) archived. The insulating vacuum reading
bi5-cc-pc1, more directly indicating the cool down, is however not
available through viewlog.
2. AGS archiving: AGS rf frequency is now archived with more than 50%
chance on the same archive page.
3. Problems:
a) FEC018 reported problematic - rebooted;
b) Coalesced AGS beam shows a double peak about 100ns apart,
arriving at two different spots on H10; reset to non-coalesced
setting;
c) AGS main magnet overheated and down for 3 hours, rf tripped;
d) AGS extraction not stable, and at unusual H10 position; needs
work;
e) psuq3 tripped, psutv1, utv5, utv7 stby, could only be set back
by target guys;
f) u line pet page WFG not updating -- rebooted FEC009;
g) RHIC 4 o'clock service building roof fan reported on, cold,
water on floor.
Eve TRBOJEVIC, Tepikian, Connolly, (Wei, Ahrens) #9 p24-30
----------------------------------------------------
1) After tuning the end of the U-line and W-line we could never get
rid of the losses at the IPM ylm8.1
2) During the whole shift the beam was pretty stable and none of the
applications tripped off. The BPMs showed movement of the beam
consistent with the flags.
3) Horizontal and vertical scans by pswtv6 & pswth5 through the who;e
aperture have never reduced losses at ylm8.1
4) The IPM background corresponds directly to the reading of the loss
monitor ylm8.1
5) If the losses at ylm8.1 could be lowered from their present range
of 5400 to 6300, down to 300, the IPM would be able to have normal
backgrounds.
================
JANUARY 21, 1997
================
Owl No shift
----------------
Day WEI, Dell, Brown, Mane et al #9 p31-46
------------------------------------
1. Stability of multi-bunch extraction: BPM recording of 4-bunch
extraction from AGS shows that variation in transverse trajectories
to be of order of 1 mm or less. Pulse-to-pulse variation of BPM
reading is also of the order of 1 mm over a time period of 30
minutes. The variation of intensity (on uxf1) amoung 4 bunches is
similar to that between pulses.
2. RHIC cool down: Viewlog archive shows the decrease of sextant
recooler outlet temperature (yo5-q6, yo5-q14, yo5-q21, yo4-q14,
yo4-q6), reaching below 80K. The longitudinal displacement on
yo5-du3 is shown to be above 150 mil, that on bi5-du3 remain near 0.
3. AGS, u, and w line dispersion:
The dispersion at u and w line flag locations is shown to be
significantly different from both the design and last year's
measured value.
Flag measured (m) design (m) last year's measure (m)
uf2 2.2 2.3 2.0
uf3 -0.5 0.0 0.0
uf4 -1.5 0.1 -0.1
uf5 -0.5 0.0 -0.2
wf1 -1.9 0.0 -0.4
wf2 -0.3 0.0 -0.1
wf3 -1.1 0.0 -0.2
4. AGS, u, and w line momentum aperture:
line full aperture Dp/p
AGS 1.0 %
U 2.9 %
W 1.2 %
5. Problems:
a) Flag application can not handle multi-bunch pulse (showing 3 out
of 4 profiles with identical image);
b) PS uq1, uq2, uarc4 tripped, uq1 reset by target group.
c) BPM ubh8 and ubv8 not functioning.
6. Tuning: PS file Jan.17.97.07:30 shows transmission of 91 +/- 7%.
BLM shows loss at 8 degree bend and near ATR dump. BPM reading
shows that horizontal injection position has changed 3 mm from that
of last week. The injection angle has also changed. (correction:
Eve No shift
----------------
================
JANUARY 23, 1997
================
Owl No shift
----------------
Day WEI, Tanaka, Tsoupas, Mane, Van Asselt, et al #9 p49-62
-----------------------------------------------------
1. Reset AGS FEB extraction point: It is found that FEB extraction
condition is significantly different from last year's at AGS. The
transverse tunes were inproperly set with missing points at
FEBrequest (used for RF dipole study instead). The sextupoles were
inproperly set to 100 A. The newly set and measured tunes at AGS
are:
Set Measured
H 8.77 8.72
V 8.75 8.80
with bumps off. The horizontal tune is expected to decrease, and
the vertical increase, as bumps are turned on. The sextupoles are
set to 50 A, avoiding beam disruption when bunps are turned on (one
sextupole is sitting on the bump). AGS main field and rf frequency
at extraction are found to be the same as last year's.
B0 = 11.225 kG, f(rf) = 2.961 362 MHz.
2. FEBrequest timing shift: Since the AGS main magnet function has
been changed recently to start the flat top at 2200 ms (instead of
2000 ms) after AGSt0, the FEBrequest event is delayed by 100 ms to
FEBrequest = 2300 ms after AGSt0.
3. Emittance measurement in AGS: Emittance is measured again in the
AGS with IPM for User2. The new values are
E(x) = 11.3 +/- 1 mm mr
E(y) = 12.0 +/- 1 mm mr.
Note that the fitting argorithm of IPM application often gives
incorrect result. So, double check before concluding results!
4. RHIC cool down: Viewlog shows recooler temperature reaching 4.5 K.
5. Problems:
a) BPM data taken on 1/15/97 for dispersion evaluation is no good.
Measurement needs to be repeated later when everything is
stable, and after we finish things of higher priority.
b) AGS IPM application often give incorrect fitting and emittance
result even with decent-looking profiles.
Eve No shift
----------------
================
JANUARY 24, 1997
================
Owl No shift
----------------
Day No shift
----------------
Eve WEI, Dell, Brown, (Peggs, Mane, MacKay, Kewisch, Satogata, et. al)
------------------------------------------------------------------ #9 p63-70
1. Sextant Commissioning Approval: The approval has been
granted. Sweep was done to the ATR lines and the sextant. Final
safety checkup still going on.
2. AGS FEB Extraction Condition Change: The radial orbit in AGS has
been changed to center in AGS, hoping to bring the actual tune
closer to the set value. The position on the H10 flag is shifted to
the left by about 5 mm (2 mm per small box on H10 flag). The H10
strength should be increased accordingly to bring beam to proper
position on UF1 flag. The expected change in beam momentum is
Dp/p = -0.25 %
i.e., the set gamma may need to be changed as
Gamma = 12.1456 (old) -> Gamma = 12.115 (newly guessed)
3. Sextant Power Supply: The ramp limit for the main sextant power
supply is set (#9, p. 70) to be 3 Amp/sec. The proposed currents
are:
Dmain = 547 A
Qmain = 494 A
Qtrim = 0 A
4. RADON Application: Data taken for longitudinal emittance
measurement through the AGS cycle.
5. Problems:
a) FEC138 had to be rebooted - may affect permit module & link.
================
JANUARY 25, 1997
================
Owl TRBOJEVIC, Connolly, Tepikian, Mackay, Satogata, +1000s #9 p72-78
--------------------------------------------------------
1) First beam from the AGS was obtained at 5 am
2) The BPMs did not work, FEC007 crashed three times. The loss
monitors at the beginning of the Y-line did not work.
3) After setting the design file we saw beam at both YF1 and YF2
flags. Set two trims upstream of the YF1 flag.
4) The loss monitors in the second part of the Y-line worked and
showed losses at the end of the arc.
5) File saved Jan.25.9:30
Day MACKAY, Peggs, Fischer, Tsoupas, Satogata, + 1000's #9 p79-82
--------------------------------------------------
1) BPM timing readjusted by Todd and Tony -> Signals from u- and
w-line
2) Loss Monitor Application problems -> often no values back,
situation improved later, but no data from the beginning of the
w-line
3) often no beam after request
4) fec007 had to be rebooted
4) magnet manager had to be restarted twice
5) the flag application occasionally stops fec007 from working
properly thereby causing additional problems with current and loss
monitors
6) wq6 current was still zero and disturbed the optics considerably
(clearly visible on yf1)
7) last currents saved in Jan.25.97.15:20
Eve WEI, Dell, Brown, (Tanaka, et al) #9 p83-96
-----------------------------------------
1. Main Progress: The beam passed the y-line with almost no loss,
entered the sextant. Beam image seen on all u, w, and y line flags.
2. Tuning: With PS file Jan.25.97.20:00 , the beam was tuned
with about 100% transmission through current transformer yxf1. The
beam was centered on flag yf2, passing through the Lamberson magnet
with BLM showing loss at 3 meter after the Lamberson (ylm16.1).
The switching magnet, yth7, and yth9 have been used for horizontal
tuning, and ytv6 and ytv10 used for vertical tuning.
3. AGS Beam Conditioning: The AGS was tuned to lower bunch blowup near
transition.
4. RHIC Data Archiving: Viewlog showing the sextant recooler
temperature remainning at about 4.5K. All vacuum readings stable.
5. Problems:
a) Flag application stops if all 4 frame grabbers are used -- using
2 instead.
b) BPMs not working.
c) MCR shows RHIC gates 5GE1, 5GI1 open, mostly due to system
malfunction. -- responsible person called in, and resweep.
d) PS uarc4 WFG readback stops updating (magnet shown ON) -- target
desk called, and replaced analog card.
e) Quench protection tripped for no obvious reason -- reset. ODH
alarm still sounding, hopefully recover after sweeping.
================
JANUARY 26, 1997
================
Owl SATOGATA, PEGGS, Thompson, Mane #9 p98-114
---------------------------------------
1) At ~2000 (Jan 25) the 4 degree bend dropped. Target desk replaced
an analog card. At 0100 (see item 2, below) we retuned with new
calibration. Restored the trims properly, and saved as
Jan.26.97.05:30
2) At ~2130 (Jan 25) 2 gates at 4 o'clock showed open. Learning curve
problems with sweep procedure. Original problem was a faulty
microswitch.
3) Tune YTH5, YTH7, YTH9 to get beam HORIZONTALLY centered on YF1 and
YF2. Tuned YTV10 to get vertically centered on YF2. BEWARE of
maximum power supply strength of +/- 14 A (hence *3* horizontal
trims).
4) Save Set 970126.0700 has beam centered on YF1 and YF2, H and V.
This produces losses half way around the sextant! First "beam" in
RHIC? Save Set 970126.0710 is a slight improvement.
5) Started tuning on loss monitors around the Lambertson. Partially
finished saveset, with YP1 amd YTV10 adjusted and intentional
vertical offsets, saved as 970126.0800
Day FISCHER, Peggs, Tsoupas, Thompson #9 p114-123
-----------------------------------------
Beam to sextant dump @ 14:09 ! 970126.1530
Eve WEI, Brown, Dell, Tanaka, (Satogata, et. al) #9 p124-145
----------------------------------------------------
1. Beam parameter for sextant-dump hitting beam:
The beam that hits the sextant dump with about 100% ATR-sextant
transmission has the following parameter:
Gamma = 12.15
N = 2 x 10^8 (up to)
S = 0.6 eV s/u (95% bunch area)
sigma(p) = 5 x 10^-4
sigma(l) = 5.6 ns
Ex = 10.7 +/- 0.7 mm mr
Ey = 11.7 +/- 0.9 mm mr (normalized emittance, 95%)
2. Momentum aperture scan:
The full momentum aperture has been scanned by varying magnet
strength
Location Dp/p (full)
AGS 1.0 % (bumps on)
U 2.9 % (4 and 8 degree bends)
W 1.2 % (20 degree bend)
SWM 3.3 % (switching magnet)
Y 1.5 % (90 degree bend)
Sextant entrance 3.4 % (Lamberson)
3. Preliminary optics measurement:
The beta function has been found to be very different from design,
possibly due to matching problem.
Flag Measured beta(x,y) Design beta(x,y)
uf1 (192, 7) (66.0, 3.8)
uf2 (38, 4) (6.4, 6.3)
uf3 (19, 17) (14.4, 52.4)
uf4 (38, 21) (39.2, 12.8)
uf5 (15, 32) (12.7, 51.5)
wf1 (90, 10) (65.0, 9.5)
wf2 (5, 333) (6.0, 92.3)
wf3 (134, 29) (99.9, 8.7)
yf1 (14, 305) (19.8, 80)
yf2 (29, 86) (14.1, 39.0)
Note that yf1 is saturated even with maximum attenuation; others ok.
4. Emittance measurement:
Using IPM in AGS, the horizontal emittance evaluated without taking
into account of momentum spread is 14.6 mm mr. With coelascing, the
momentum spread is large, and the contribution needs to be
subtracted. Final value becomes for an intensity of up to 2x10^8
per bunch is Ex = 10.7 +/- 0.7 mm mr, Ey = 11.7 +/- 0.9 mm mr
5. Difference orbits:
BPM diffenence data is taken for u, w, and y lines by varying front
trim (D(psuth2)=0.15 mr, D(psutv1)=-0.2mr), comparing with
corresponding design values. The majority of u and w line BPM shows
agreement. The y line data, however, indicates possible polarity
reversal.
6. Problems:
a) Permit link frequently trip;
b) Front U line trims tripped, had to be set local at set value;
c) sextant BPM not working, PS and Flag needs several restart;
d) FEC018 rebooted.
================
JANUARY 27, 1997
================
Owl SATOGATA, Thompson, Mane, Wei #9 p145-153
-------------------------------------
1) At ~0000, Ganetis reported that permit link had dropped, along with
main quad and dipole buses and switching magnet. Immediate solution
was not available, an expert was called in, and systems were
restored to 970126.1530 magnet settings and cautiously reramped by
0230. George is officially requesting downtime on Monday to check
out the main magnet systems.
2) As reported in last shift, psutv1 is having hardware problems and
cannot be reset remotely. Attempts to leave it on but in local mode
proved confusing, so it was turned off, and psutv4 was used to
correct vertical injection orbit instead.
3) Losses appearing in middle of sextant eventually attributed to a
small difference in the main dipole bus strength after midnight
reset. (p. 149) Tweaking up this current restored full transmission
through transformer yo4-xf3.
4) Sextant arc dipole correctors and loss monitors were used to
clearly show 90-degree phase advance per cell in
sextant. (pp. 151-152)
5) BPM timing in 1004A is very far off, o(10s of us), and remains
uncorrected. Flash memory problem in 1004A BPM DSP confirmed by
Chris Degen and Tom Shea, and newly burned DSP appears to work
except for timing issues. BPMs up through lambertson region (1005E)
are working, but appear to have polarity problems.
Day MACKAY, Pilat, Tsoupas #10 p1-4
------------------------------
1) Flag yo4-f3 recalibrated - shortly after it locked up.
2) Shutdown @ 2pm for tandem source change
RF system test
PSSWM needs to have klyxon changed
3) yxf1 not updating reliably. Sometimes wxf1 does not update.
4) yo5-bh12 is wired up with +x pointing into the center of the ring.
(AtR convention, not RHIC convention.)
5) RF can trip vacuum pumps when power is increased. In steady state
pumps might not trip.
6) Recommend not turning the PSSWM to "off", since this shuts off
water flow.
Eve KEWISCH, Ahrens, Fischer, Satogata #10 p5-6
------------------------------------------
1) problems with power supplies througout the shift: utv1, swm and
yarc90. at the end of the shift utv1 is still not working. also,
the slowClock task died 2x on fec009 and 1x on fec141. this caused
the update on the screen to stop and complicated the diagnostics of
the ps problems.
2) m. brennan used the shift to work on the multibunch
synchro-extraction and was successful.
3) leif worked on the booster intensities (with no official result).
================
JANUARY 28, 1997
================
Owl SATOGATA, Thompson #10 p7-19
--------------------------
1) Restored 100% transmission lattice for day shift, from total
shutdown in evening shift. Former lattice (970127.0510) did not
restore beam transport. New lattice created (970128.0645) with
small changes in main arcs, vertical steering at injection, and
vertical steering in lambertson region. There were few problems
with power supplies this shift.
2) cfe-wh-inst (acnfec007) was rebooted; multipulse extraction of
previous shift killed this front end when a flag profile monitor
app was running, iconified, at the controls console. **>>Do not run
flags with multiple extractions<<** acnfec131 was also rebooted
because of this problem.
3) Early U-line magnet filter was cleaned and replaced by target desk,
after reporting an 80-lb differential near 0200.
4) Typical beam currents, even after Brennan's efforts, were well
below previous numbers, ranging from 1.0-1.6x10^8. Synchro
extraction, reported to be tuned up last evening, did not work;
approximately 40% of requests delivered beam.
Day TRBOJEVIC, Pilat, Connolly #10 p20-26
-----------------------------------
1) Measured the phase advance in the sextant: preliminary fit gives
82.3 degrees for the 80 deg phase advance lattice. We put 1 A kick
in every horizontal corrector in the sextant (1 A = 0.00005994 rad)
and measured the position on the yo4-f3 flag. All flag and BCM
data archived. We repeated the measurement in the vertical plane,
by varying the vertical dipole correctors. A more sophisticated fit
is planned.
2) The main dipole quenched twice, misteriously. We ramped the main
power supplies and the switching magnets back without problems.
Carl Schultheiss moved the setpoint on the main dipole power supply
by 0.85 A. The wfg setpoint that reproduces the same readings on
yo4-f3 for y-dmain-ps is now 555.85
3) Roger took good data on the IPM during the main PS ramping.
4) Beam was turned over for RF tests at 1:30. That brought the vacuum
valve down. It was not possible to run beam in parallel. They were
asked to stop. During the beam interruption utv1 was fixed.
5) fec009 had again a tSlowClk SUSPEND and it was reset (not
rebooted).
6) When finally ready to get beam in the sextant again, no extraction
from AGS. Kicker timing problem discovered. Beam turned over to AGS
to reset kicker timing.
Eve KEWISCH, Ahrens, Teoikian #10 p27-35
---------------------------------
Shiftgoal: Calibration of flags using the beam.
1) Measurements were done for uf3, uf4 and uf5. The measurements
confirms the flag calibration within 10%.
2) The beam was moving from pulse to pulse horizontally. The septum
was was suspected as source of the motion. The spread of beam
postions in ub5 was compared with the movement caused by a change
of the septum setpoint. It was determined that a 0.25% change of
the septum current produces the observed spred of the injection
position.
================
JANUARY 29, 1997
================
Owl WEI, Brown, Dell, (Peggs, Satogata) #10 p36-60
-------------------------------------------
1. Sextant Aperture Scan: The sextant momentum aperture is scanned
with fixed injection condition and the Lamberson, varying main
dipole and quad strength. The aperture is
Dp/p = 1.8 %
The window for main dipole and quad is:
Main D Center Window
Dipole 554 A 549 - 559 A
Quad 485 A 470 - 500 A
for a beam of Gamma = 12.25.
2. Sextant Main Dipole/Quad Hysteresis Study: The hysteresis of the
main dipole and quads are studied independently, recording all
current transformer, and flag data of yf1 and yo4-f3. The lag in
main dipole current is about 2 A.
3. ATR Injection Retune: The H10 is retuned to center beam on flag
uf1. The 4 degree arc (psarc4) is rescanned, and the new set
current is 20 A higher than the previous day. The new PS file is
970129.08:00
4. Transverse and Longitudinal Emittance:
With a gamma_T jump in AGS, the beam profile is greatly improved.
S = 0.6 eV s/u @ ~ 2.3 x 10^8 per bunch
E_x ~ E_y ~ 11 mm mr
A slight growth in vertical emittance is observed at AGS transition.
5. Viewlog RHIC Archive: -- show crate temperature at FEC007 and
013 higher that 55 C. Vacuum condition change recorded during rf
system development
6. Problems:
a) suspected calibration problem in psarc4;
b) utv1 works in local only.
Day TRBOJEVIC, Connolly, Pilat #10 p61-69
----------------------------------
1) The first hour and a half we repeated the phase measurements in the
sextant - vertical tunes (Fulvia and Roger)
2) There was an access from 1000 - 1400
3) We came back at 1600 with all power supplies up. There was a
slight change in the AGS kicker strength to adjust the UF1 position
of the beam.
Eve KEWISCH, Ahrens, Tepikian #10 p70-76
---------------------------------
shift goals:
kicker timing
flag calibration
sextant phase advance
1) Kicker timing studies required no change in the u-w-y lines.
Started measuring the beam in the sextant. failure of power
sub-station killed u-line until 10:30.
2) After restoring the beam flag calibration of wf1-wf3, calibration
seems to be within 10% of expectation. detailed number crunching
postponed until tomorrow.
================
JANUARY 30, 1997
================
Owl WEI, Brown, Dell, (Ahrens, Satogata) #10 p77-94
--------------------------------------------
1. Sextant and ATR Dispersion Measurement: The dispersion in the
sextant and ATR is measured by changing the radial loop function,
while measuring and archiving beam position on all the 11 flags and
all available BPMs in the sextant and ATR, along with all current
transformer data and AGS rf frequency at extraction.
2. BPM Study: Difference orbit, generated by varing the first H trim
uth2 by 0.15mr, is compared with prediction. Agreement is obtained
on most of the u and w line BPMs, plus a few in the y line and the
sextant.
3. Viewlog RHIC Archiving: Viewlog recorded about 0.2 C temperature
surge in all 5 yellow recoolers, around that time a quench
protection was tripped. Crate temperature on FEC007 and FEC013,
above 55 C in last few days, droped below 50C.
4. Problems:
a) Quench permit link was tripped about 10 times, each time causing
PS down at switching magnet -- software problem suspected.
ADC card in 5 alcove b was replaced. Main sextant PS has to be
ramped locally at 1 A/sec.
b) utv1 still in local.
Day TRBOJEVIC, Connolly, Pilat #10 p95-109
---------------------------------
1. We measured the tunes in the 90 degree arc-y.; the data needs to be
analyzed.
2. From 11:00 - 13:00 there were kicker commissioning studies. It was
found that the 32 KV, expected design voltage for the kicker,
replaced successfully the yo5-tv9 dipole at 30A.
3. With the radial loop "on" in the AGS, we started chromaticity
measurements, but they were interrupted by TANDEM failure.
Eve FISCHER, Tsoupas, Satogata #10 p110-113
---------------------------------
1. M. Brennan worked 2 hours work on rf.
2. L. Ahrens timed-in the AGS extraction kicker.
3. Attempted measuring the kicker rise time from Bldg. 1005e.
4. Competing users (AGS RF, RHIC RF, BPM, kickers) lead to too many
used pulses, and increased the radiation level in tunnel. Kicker
measurement were given priority.
5. The foil in Tandem was changed to reduce intensity.
6. Power consumption reached limit and was reduced.
7. Finally, the kicker rise time (with 4 kickers) was to be measured
during the owl shift.
================
JANUARY 31, 1997
================
Owl WEI, Dell, Brown, (Satogata, Mane) #10 p114-136
---------------------------------------
1. Sextant Chromaticity Measurement: Simultaneous BPM, Current
transformer (yxf1 and yo4-xf3), and flag (yo4-f3) data is taken for
chromaticity evaluation. On 5 different momentum orbits (obtained
by varying AGS radial loop), each of the 16 horizontal sextant
correctors is powered at a 1 Amp difference, while archiving BPM
and flag beam position. Another synchro-mode scan, obtained by
varying independently each of the 31 horizontal and vertical
correctors, is archived for comparison.
2. Sextant and ATR Dispersion Measurement: First and second order
dispersion can be obtained by data collected above.
3. Sextant Transfer Matrix and Difference Orbit: Numerious difference
orbits can be created from the above data and compared with the
model.
4. BPM Development: BPMs in both ATR and sextant have been shown to
finally work properly, both with synchro mode and radial loop. The
difference orbits obtained by varying uth2 and utv4 show agreements
with the model within about 10% accuracy in u and w line, predicted
oscillation down the y line 90 degree arc, and good stability in
most of the sextant units.
5. Problems:
a) Excessive power consumption has been reported, possibly due to
testing of the cryo group (8.2 MW increased to 11.7 MW). Viewlog
shows surge in ambient flow of helium, more than doubled from its
normal value -- asked by MCR to cut down comsumption by 1MW.
b) Chipmunks in the beginning of the sextant were tripped many times
during the chromaticity scan -- MCR was instructed by K. Reace to
ignore the message.
c) Flag application frequently refuses to update, even when only
1 framegrabber is used. Sometimes, the image was not updated, but
the time stamp did, a potential trap for innocent users.
Day TRBOJEVIC, Connolly, Pilat #10 p137-142
----------------------------------
1. Site power comsumption is 51.6 MW - Cryo load has increased by 1.5 MW.
a). Shut off "A" line.
b). Used 4.6 sec repetition rate.
2. 1000 shot history.
3. Reduced BLM gain & scanned with yo4th4.
4. Scanned BLM HV.
5. RF x-ray measurements at Bldg. 1004A.
6. No summary included in data book.
-----------------------------------------
Eve FISCHER, Tsoupas, Satogata, Trbojevic #10 p143-149
-------------------------------------------
1. Successful multibunch injection into RHIC using injection kickers.
2. Injection kickers were used throughout the whole shift without
problems.
3. Risetime of injection kicker was measured without kicker A
(weaker).
4. Emittance measurement: hor 10 um, ver 12 um.
5. Ongoing work on BPMs.
================
FEBRUARY 1, 1997
================
Owl KEWISCH and Pilat #10 p150-154
-----------------------
1. Shift goals:
a. flatten orbit
b. change sextant phase advance
c. measure phase.
2. Results:
a. BPMs worked initially, with lots of restarts, but then failed.
b. Orbit flattening was aborted after three hours.
c. Ramped qmain current from 485 to 505 amps in steps of 5 amps and
corrected position of beam on flag yo4-f3 after each step,
d. Measured phase advance using correctors and flags. Quench after
80% of measurement.
Day SATOGATA, Thompson, [Ahrens] #11 p 1-9
------------------------------------
1. MAGNETS: Main magnet still down from evening shift, with Ganetis
and crew investigating. Discovered correlation between magnet
quench trip problems and changes in power grid after HIP
shutdown at midnight. (p. 4) Magnets return at 15:45 (with
quench detector limit set to 650 Amps) and full transmission
restored by 16:00. Lattice saved as-is at end of shift, with
some correctors tweaked, as 970201.1650.
2. ORBIT/BPMS: Orbit manager recompiled and does not crash for 6
hours, then crashes several times late in day. Procedure for
restart entered in log book. Before main magnet was restored,
U and W line studies performed with reliable BPMs. Clorb
correction shown to work with *simulated* single dipole errors
in morning; later used to correct U and W-line horizontal
orbits from 10+ mm to 2-3 mm from zero orbit. Clorb procedure
entered in log book. Sextant and late Y-line BPMs remain not
working at end of shift.
3. AGS: Some problems due to studies, tandem problems, and
shutdown. BTA quad QV9 tripped several times. Delivered
intensities varied wildly, from 6x10^7 early in shift to
well-tuned 2x10^8 extraction near end.
*) REQUESTS:
1. Jim Rose would like 1/2 hour of four-bunch extraction sometime.
2. George Ganetis will be coming in at 7 AM tomorrow, Sunday, to
attach trim yo4-qtv6 to the valve box. Estimate 1-1.5 hour main
mag downtime.
Eve FISCHER, Wei, Tsoupas #11 p10-18
--------------------------
1. Needed to trim whole line again, reached 95% transmission, saved as
970201.2115
2. For 3 quadrupole strengths in sextant, all horizontal and vertical
correctors moved one after the other by 1 A and observed position
on at flag yo4-f3.
================
FEBRUARY 2, 1997
================
OWL KEWISCH, Pilat #11 p19-28
-------------------
1. Shift goals:
a. measure phase advance,
b. measure beam profiles with different qmain currents.
2. Summary
a. acnfec007 was rebooted.
b. Wolfram tested his injection program. It works but is not ready
for public use.
c. Phase advance measurement:
i. movement of baseline orbit was observed,
ii. time constant is minutes,
iii. phase advance measurement was completed,
iv. baseline orbit was measured after each step.
d. Profile measurement was started but not completed.
e. Foil change ended shift.
Day SATOGATA and Thompson #11 p29-39
--------------------------
1. Stability of beam at yo4-f3.
2. Checked loss monitor sensitivity.
3. Saved:
a). Magnet file 970202.1613,
b). BLM file 02FEB1612, &
c). BPM file 161408.
4. Massive BPM data saved in OrbitDisplay/orbits/Feb02Day.
5. Plotted dependence of BLM sensitivity on th12 deflection.
6. No summary included in data book.
--------------------------
Eve TRBOJEVIC, Connolly, Tepikian, Wei #11 p40-56
----------------------------------------
1. Measured Beta_x and Phi_x from BPM difference orbits kicking the
by;
yo5-uth10, yo5-uth12, and yo5-uth14.
2. Measured Beta_y and Phi_y from BPM difference orbits using:
yo5-utv9, yo5-utv11, yo5-utv-13, and yo5-utv17.
3. Measured the horizontal tune, using the BPM's and flag yo4-uf3, at
different quad bus currents.
(qf) trim trim quad -20A, +35A, +15A, 0A
4. Used the BMP's to measure successfully the dispersion function in
the SEXTANT.
----------------------------------------
================
FEBRUARY 3.., 1997
================
Documentation of paramenters and plots of results #11 p57-98