Log entry time 08:04:31 on October 15, 2010

Entry number 334985

Crew:
J. Roche
Y. Zhihong
F. Itard
 

Highlights:
Taking calibration data on the dvcs calorimeter.
 

Timeline:

• 1:00 am: start shift with calorimeter elastic calibration in progress. Pnom=2.406 GeV, thenom=37.00 deg. Beam current is 2.9 uA (per MCC value) . Beam is centered A(x,y)=0,-1.3 and B(x,y)=0,0. No raster. Beam energy is 5551.76 MeV. Ps5=1 all others at 0. T5 rate is 9 Hz at 3 uA beam current.
• 12:00: Alex, Carlos and Magali are working on the DVCS DAQ.
• 00:30: taking one run in nominal condition at 4.7 uA: run 7379.
• 00:44: back at 3 uA.
• 2:00: Florian starts the checklist
• 2:20: MCC announces that they will do a bit of steering in the injector.
• 3:00 time to change configuration: request access to check the ladders are unlock. They are.
• 4:00 Trouble moving the spectro to the correct angle: this entry
• New LHRS configuration is : Pnom=2.607 GeV, thenom=34.76 deg. T5 rate is 7.7 Hz at 3 uA beam current.
• 6:05. MCC looses beam and cannot restore it. They call their experts and report that it's going to be a while... We are missing 20 min of data at this setting.
• 6:45: beam is back
• 7:30: trying to go to the next kinematic. The LHRS is stuck again, paging Howard Smith. Howard says he is on is way.

Run list:

• Elastic calibration (Pnom=2.406 GeV, thenom=37.00 deg, HV=500 V): 7381 (no ARS data :(, not sure why ) , 7382 , 7383
• Elastic calibration (Pnom=2.607 GeV, thenom=34.76 deg, HV=500 V): 7384, 7385, 7386