owl shift summary

keyword=owl shift summary

October 29, 2010, Owl shift summary

Crew:
J. Roche (SL)
L. Selvy (TO)
D. Flay

Highlights:
Changed Helicity flip rate from 120 Hz to 943 Hz
Smooth production on DVCS kine 3-low

Timeline:

12:30: reverted helicity to its nominal flipping rate see halog
1:00L initial check out of configurations: DAQ configuration is TrigDVCS, 2uA beam no raster, 15 cm LH2 target, beam position is A(x,y)=0.1, -0.1, B(x,y)=0.0, 0.0. LHRS nmr locked, P₀=1.494 GeV. HV detectors are on, DC currents on calo are low (max value is ~0.1). Compton rates are ok for data taking (~2.5 kHz/uA beam). T5 is not prescaled and rates are ~58 Hz.
3:45: coda crashes at the beginning of run 8022.

Run list:

Run 8017: ~ 1h, 220 k events
Run 8018: ~ 15 min, 68 k events, run interrupted when helicity fliping rate was changed
Run 8019: ~1 h, 195 k events
Run 8020: ~1 h, 233 k events
Run 8021:
Run 8022: junk, coda crash
Run 8023: short (25 min) but good, kille coda by accident
Run 8024: ~ 1h, 200 k events
Run 8025: ~ 1h, 200 k events
Run 8026: ~ 1h, 200 k events
Run 8027: ~ 1h, 200 k events

Compton Run list: