Polarized Proton Run-11 Set UpPlan

(last updated on 12/21/10)

    Cool-Down Mode : one week (01/03-01/09)

expect no beam work for most of the week. First three days are for cooling down to 4K. 2-3 days of power supply setup will follow. Due to trim quad P/S upgrade work, we can not work with beam until it is complete. There may be some EVE/OWL shifts near the end when blue is ready while P/S group is working in yellow. Estimates: ~4 shifts available for beam in blue in last two days while P/S group is working on yellow.

      Blue Ring Injection Setup without Snake

o     AGS to RHIC synchro. The target frequency of 28.128770MHz;  (RF group)

o     AGS extraction and AtR tuning. (Nick Tsoupas and Vincent Schoefer)

o     With Blue magnets ready (even without the hysteresis), try the injection to ensure that there is no obvious problems for circulating beam (like obstacles).

o     Continue setup for Blue ring according to “Injection setup” plan in “Startup Mode” below.

    StartUp Mode: 2.5 weeks  (01/10-01/27)

Remaining P/S work continues for 3-7days during DAY and EVE shifts. Only one shift per day for beam setup..

      Injection setup (6 days: first 4 days are blue only)  (01/10-01/15)

o     Set injection from ATR into RHIC rings:

§         Injection with kicker off: set bo6-tv9 and yo5-tv9 to 1.3 mrad, no snakes.

§         Injection kicker timing adjustment: (Greg Marr)

§         Minimize injection losses.

§         Steer the beam around the ring and achieve continuous circulation.


o     Setup snake orbit bumps  and turn on the Snakes. Adjust tunes and vertical orbits. Optimize snake bumps to eliminate injection losses at snake locations.

o     RHIC RF work with 28MHz. (RF group)

o     Instrumentation Setup

§         Tunemeter(Artus) (with tunes in upper half). (Angelika)

§         Injection damper setup (upper half tunes). (Rob)

§         Schottky (Kevin Brown)

§         BBQ (Kevin Mernick)

§         BTF (Kevin Mernick, Michiko)

§         IPM. (Roger Connolly, Steve)

§         WCM. (Larry Hoff)

§         CNI polarimeter: (Bill, Anatoli, Haixin)

o     Catch beam with 9MHz cavity. Test the switch back and forth between 9MHz and 28MHz cavities. 1-2 shift(s).

o     Machine tuning

§         Orbit correction (goal is for rms orbit below 0.3mm).  (Vadim)

§         Optimize bend trim/orbit radius.

§         Decoupling. (Yun) 

§         Chromaticity correction. (Steve, Al, Michiko)

§         Optics measurement and correction. (Mei, Joe Aronson)

o     Check the spin pattern request against the measured. (Bill, Anatoli, Haixin)

o     Snake current scan (measuring polarization) at injection ( at least 1 ring)

o     TOCC feedback development (Al, Michiko,Steve,Vadim, Yun)


      Ramp development (6 days)  (01/16-01/21)

o     Ramp development with 6 bunches

§         Intensity: 0.15-1e11/bunch

§         Use corrector settings (skew and dipole) from last run ramp as starting point

§         Work items:

a)      Radial loops.

b)      tune/coupling/orbit feedback(Al, Michiko,Steve,Vadim,Yun)

c)      Orbit correction along the ramp ( < 0.3mm rms )

d)      Decoupling along the ramp. (Yun)

e)      Chromaticity along the ramp( chromaticity ~2-3 units) (SteveT)

f)        Verify transverse IR orbit separations and longitudinal relative phase. (Vadim)

o     Experimental magnets, PHENIX and STAR, switch on, when ready. Do necessary ramp adjustments.

Commissioning 9MHz at injection and on the ramp (5 days)   (01/19-01/23)

Although it is listed separately, it is expected that the 9MHz commissioning uses one and 1/2 shifts per day. The rest will be the stop development. .

o     Catch beam with 9MHz cavity.

o     Establish ramp with 9MHz for six bunches.

o     Develop rebucketing into 28MHz.

o     Step up bunch intensity (with feedback at injection).

o     Step up number of bunches.


Store development (6 days)   (01/22-01/27)

o     With 6-56 bunches, bunch intensity about 1.e11

o     Establishing collisions. DX BPM timing (Angelika, Rob).

o     Store optics adjustments:

§         Orbit correction, decoupling, chromaticity.(Vadim, Michiko, Yun, Al)

§         Dispersion function measurements and correction (if needed) (Mei, Joe Aronson)

§         IR nonlinear corrections. (Chris Zimmer)

§         Betatron tune scans: verifying available working point window.

§         Optics measurements with AC dipole. (Mei, Joe Aronson)

o     Collimation setup. (Angelika)

o     Evaluation of store reproducibility and slow orbit feedback. Optics comparisons for stores separated by 24h. (Vadim, Michiko)

o     Evaluation of beam-beam limit:

§         (Gradual) increase in bunch intensity (goal is 1.4e11)

§         Observing lifetime, luminosity and experiment background dependence on the bunch intensity.

§         Measuring beam-beam tune shifts and emittance blowups.

o     Good polarization transmission efficiency on the ramp.

§         Tune and orbit adjustments on the ramp.

§         Polarization measurements on the ramp.(Bill, Anatoli, Haixin)

§         Scan vertical tune on the ramp with different rms orbit. Check polarization on the ramp and at store.

o     Testing 10Hz feedback system (depends on preparedness) (Rob, Michiko)

o     Test if the 197MHz cavities can be used to reduce the vertex further. (RF group)

o     Rotator ramp development. (Waldo)





    RampUp Mode: 1 week  (01/28-02/04)

2 shifts per day; Owl shift for experiment setup.  

      Ramp development with intense beam (7 days)  (01/28-02/03)

o     109 bunches.  Verify injection kicker timing. Ensure that there is no emittance blowup. (Greg)

o     Evaluate pressure rise at the injection with 109 bunches and more than 1.3e11/bunch. (Wolfram, SY)

o     Do beam conditioning of vacuum pipe with intense beam, if needed (Wolfram,SY)

o     109 bunch ramp development:

§         (Gradually) increase intensity bu increase bunch numbers, starting with ~1.4e11 per bunch.

§         Work on beam losses reduction (orbit, tunes adjustments) on the ramp. Evaluating the intensity limit due to beam losses (if exists)

§         Verify relative longitudinal phase.

§         Collimation on the ramp (in some form). (Angelika)

o     CNI polarimeter tuning. (Bill, Anatoli, Haixin)

o     Detector background evaluation. (Angelika)

o     Make judgments about optimal operation parameters: number of bunches, bunch intensities and beta*

o     Optimization of the beginning-of-store activities. (Angelika)




      Physics Running  (02/04- ...)

o     First week: machine development on DAY shift if needed

o     After first week: ~ 8 hours machine development on Thursday, to fix identified urgent machine problems and commissioing new system.