User name jpchen
Log entry time 07:05:48 on February 1,2008
Entry number 228532
keyword=CSR test: Owl shift summary
Owl shift for CSR Pb taregt cross calibration:
Shift workers: J. P. Chen (SL), X. Yan (TO), Y. Oh (3rd)
MCC vacuum problem earlier, PREX test requested to extend
23:30 started to move right spectrometer to 25 degree and set right magnets to
958.4 MeV/c. PREX lumi test continues.
midnight: spectrometer set. Requested raster size chaneg to 1.5x 4 mm.
And position to (-3.5,0). MCC were able to get BPMB to -3.5 mm, but
BPMA only to -2.2 mm.
0:00 started data taking with thin Pb target. Left DAQ problem: only can take
~300 Hz. Alexandre is checking, but problem persists.
Moved to Thick PREX Pb target.
Moved to loop 3 Pb+LH2 target.
1:15 page/called Bob Michaels.
Bob gave phone instruction for testing out.
1:45 changed to 30 degrees for both spectrometers.
2:00 Bob came in to work on fixing the problem with Left DAQ.
2:35 Bob fixed left DAQ problem
2:50 Alexandre lowered HV (~400 V) for the last 18 channels (LeCroy)
for NaI detector
3:00 Alex/Bob rebooted adaql1 to get halog work, which affected
DAQ (left stuck 6075 and right got high deadtime 3747)
4:15 move to thin Pb.
Right DAQ rate drops after a while. Not sure why. Stop run and start
again, it becomes fine.
5:17 moved to thick Pb.
6:00 changed to 25 degree and P to 982.36 MeV (+2.5%) for both arms.
moved to loop 3 Pb.
6:08 right dipole set.
6:25 move to thin Pb.
6:25 started to slowly closing down J-T for loop 3 and tuning down fan speed.
6:30-6:35 MCC doing QE measurement.
6:45 move to thick Pb.
7:00 stop beam. End of CSR test.
requested controlled access and started warming up target.
Angle Target Right Left
25 thin Pb 3741/3742 6054 (DAQ problem)
25 thick Pb 3743/3744 6055-6060? (DAQ problem)
25 Loop 3 Pb 3745 6062-6064 (DAQ problem)
30 loop 3 Pb 3746/3747* 6065-6075 (DAQ problem)
3748 (good run) 6076/6077 (good run)
30 thin Pb 3749/3750 6078/6079
30 thick Pb 3751/3752 6080
changed P to 982.36 MeV (+2.5%)
25 Loop 3 Pb 3753 (dipole not set) 6081
3754 (dipole set)
25 thin Pb 3755 6082
25 thick Pb 3756 6083/6084