owl shift summary

keyword=owl shift summary

October 25, 2010, Owl shift summary

Crew:
J. Roche
P. Markowitz
L. El Fassi

Highlights:
Production. Quiet and smooth shift.

Timeline:

00:00: starting with a controlled access in progress. The calo work during that access is summarized here.
00:45: resuming production. The spectrometer is set for 1.494 GeV, at an angle of 31.89 deg, beam energy is 4455.71 GeV. This is kinematic III low. The calo is nominally at 14.78 deg at 1.1 m from the target. The target is LH2 15 cm. We request 2 uA of beam current.
We are running with the DVCS top-bot configuration while Magali continues working on the trigger module. The "regular" configuration is Trig DVCS.
1:20: Lamia notices that the data on the LHRS are drastically different from the golden run. It turns out that Magali works on the trigger carte is not that independent to what we are doing. Magali reverts to her previous firmware version. Run 7865 is junk.
4:00: Magali is about to leave. We check that we can run with the configuration 7870: A-ok. Magali leaves.
6:30: MCC neds to do an FOPT and a QE measurement. Beam will be off for a while. Actually beam never came back for any significant length of time.
7:45: We asked MCC for an access to change the polarity of the spectrometer to positive.

Run list:

Run 7865: DVCS top bot configuration : junk
Run 7866: DVCS top-bot configuration : good
(HV off for some of the pion rejectors)
Run 7867: DVCS top-bot configuration : good
Run 7868: DVCS top-bot configuration : good
Run 7869: DVCS top-bot configuration : good
Run 7870: Trig DVCS config
Run 7871: Trig DVCS config
Run 7872: Trig DVCS config
Run 7873: Trig DVCS config
Run 7874: Trig DVCS config