AGS User2 Ramp Polarization Measurement Recipe

Haixin Huang huanghai@bnl.gov

Mar. 19, 2015

 

Description:

 

 This recipe describes how to take the polarization ramp measurement on the fast Siemens cycle at AGS user2.

 

Process:

 

1. It's ok if polarization is zero or crazy numbers(but error shuld not be zero). The online analysis won't work properly for ramp measurement.
2. Open a xterm. type
ssh cnipol3 -l mcr
cd ado
cp new_set.ini.user2.ramp new_set.ini (and confirm overwrite by answering y when prompted)

3. On pet page pet/AGS/Polarized_protons/CNI_Target, Select PPM user2 if not done so yet. Change the insertion and extraction of target timing on pet/AGS/Polarized_protons/CNI_target. Near the bottom, change the insertion "Delay from source" from 500000 to 3200000 (note how many zeroes!); change the extraction "Delay from source: from 2820000 to 650000. Make sure you select PPM user as user2 on the pet page, as the settings are PPM sensitive.
4. Take a target scan to find target center. Use value 188000 as Center Position on the target scan page for target4 when doing it the first time.
5 Change Num Events to 70 millions.
6.Take measurement. Do target scan after two measurements.
7. After the needed measurements done, reverse steps 2 to 3. namely:
change the insertion and extraction of target timing on pet/AGS/Polarized_protons/CNI_target. Near the bottom, change the insertion "Delay from source" from 3200000 to 500000; change the extraction "Delay from source: from 650000 to 2820000.
8. Open a xterm. type
ssh cnipol3 -l mcr
cd ado
cp new_set.ini.flattop new_set.ini

9. change Num Events to 40 millions