Leader: B. Moffit
Target: J.P. Chen
Worker: B. Sawatsky
Left HRS p0 = -3.7620 GeV/c Angle = 19.5°
Right HRS p0 = +1.4500 GeV/c Angle = 40.1°
BigBite Gaussmeter = 0.9325 T Angle = 98.0°
Summary
Most downtime from the controlled access to investigate target vacuum
fluctuations and trigger timing issues. Had some DAQ
problems.. (halog entries 139483
and 139488)... might
have been correlated with several xscaler processes running (Bob
killed them off, and we restarted one on a machine in the control
room. Halog entries 139491
and 139492). JP
also noticed some curious scattering chamber vacuum fluctuations
(halog entries 139459,
139460,
139469,
and 138489)
Significant Events
- 08:00 Began the shift by ending Run 1867, moving to the slanted carbon target,
and turning on the Bigbite HV. Asked MCC for 15µA
(un-rastered), and adjusted prescale factors.
- 11:26 Requested controlled access (halog
entry 139458)
- 13:19 Back from access, requested a few
different currents of unrastered beam to check rates and set prescale
factors.
- 15:23 Rebooted the trigger supervisor
crate in the Left arm, using the Slow Controls screen, to try to
alleviate the DAQ problem.
- 15:35 MCC informs us that an RF zone has
dropped out, and beam will not be back for a few minutes (experts are
working on it).
- 15:54 Beam returns (0.5µA,
un-rastered on slanted carbon).
Data Run Summary
- 08:38 Run 1868 -
Production Run (Slanted Carbon).
- 09:14 Run 1869 -
Production Run (Slanted Carbon). Set PS6 to 500 (this run only).
- 09:22 Run 1870 -
Production Run (Slanted Carbon). Returned PS6 to 99999.
- 10:24 Run 1871 -
Production Run (Slanted Carbon).
- 11:21 Run 1872 -
Production Run (Slanted Carbon).
- Run 1873 through 1881 - Junk.. DAQ
tests for T4.
- 13:28 Run 1882 -
BB aux timing check (Slanted Carbon). ~2µA.
- 13:39 Run 1883 -
Junk (Slanted Carbon). Low CODA rate, high deadtime. End of run failed.
- 13:50 Run 1884
- BB aux timing check (Slanted Carbon). ~4µA.
- 14:00 Run 1885 -
Junk (Slanted Carbon). Start of run failed.
- 14:08 Run 1886
- BB aux timing check (Slanted Carbon). ~8µA.
- 14:26 Run 1887 -
Junk (Slanted Carbon). Start of run failed.
- 14:31 Run 1888
- BB aux timing check (Slanted Carbon). ~15µA.
- 14:52 Run 1889-1895 -
Junk (Slanted Carbon). Start of runs failed (TS1 troubles).
- 15:54 Run 1896
- BB aux timing check (Slanted Carbon). ~0.5µA.
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