Log entry time 08:07:48 on November 15, 2010

Entry number 340149

Crew:
J. Roche (SL)
H. Albataineh (TO)

Highlights:
Smooth production on DVCS kine 3-low, hydrogen target

Timeline:

• 1:00: initial check out of configurations: DAQ configuration is TrigDVCSNoC, 3A beam no raster, 15 cm LH2 target, beam position is A(x,y)=0.0, -0.0, B(x,y)=0.0, 0.0. LHRS nmr locked, P₀=1.864 GeV. HV detectors are on, DC currents on calo are low (max value is ~0.16). Compton rates are amazingly low (~2.0 kHz/uA beam cavity on, 60 kHz/uA beam cavity off). T5 is not prescaled and rates are ~147 Hz, deadtime ~15%.
• 2:45: MCC calls to report that the vacuum valves before and after the target chamber tripped off (close) and then reset by themselves after a few minutes. Indeed we are seeing an excursion in the vacuum strip chart (halog). Beside that nothing bips or looks strange, so we resume production. This happened at the very end of run 8746.
• 3:05: Julie asks Hisham to take a ps9 only run (with configuration TrigDVCSNoC), that was a bad idea, we should have gone to LEFTHRS config, the DAQ hangs up. Run 8747 and 8748 are junk. Had to restart coda, abandon this little test.

 Run    Events  BCM U3   D3 (C)    Time         Avg Curr      Deadtime
 8744   626 k   0.01041  0.01134   60.1 mins    3.0132 uA    15.45%
 8745   671 k   0.01108  0.01214   67.1 mins    2.8850 uA    13.98%
 8746   558 k   0.00917  0.00998   59.2 mins    2.6953 uA    15.18%
 8749   631 k   0.01050  0.01145   60.1 mins    3.0416 uA    15.96%
 8750   620 k   0.01027  0.01125   60.6 mins    2.9586 uA    16.09%
 8751   634 k   0.01055  0.01147   61.0 mins    3.0105 uA    16.09%
 8752   593 k   0.00980  0.01068   61.2 mins    2.7861 uA    15.22%
 8753    94 k   0.00156  0.00171    9.4 mins    2.8904 uA    17.07% (stopped early but good 
anyway)