• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name dhamilton

    Log entry time 08:06:07 on April 03, 2008

    Entry number 229725

    keyword=Owl Shift Summary

    BigBite magnet switched on in preparation for elastic data-taking.
    Coil current at 390A.

    00:24 - elastic data taking at 3 microamps to check thresholds on BB E
    and dE planes. Start run 2205.

    00:45 - End of run 2205.
    Target changed to carbon single foil.
    Start of BB MWDC QE HV/threshold scan.

    00:58 - Start run 2206 (HV 1350V, threshold 5V).
    Run 2207 (HV 1350V, threshold 7.5V).

    01:22 - problems with ROC5. No data in TDCs for E and dE paddles.
    Tried to cycle the power on the crate. The problem is not solved.
    Runs 2206 - 2225 are junk.

    03:05 - Bryan Moffit arrived to help with the ROC5 problem.

    03:45 - Hall status changed to controlled access. Bryan has went to the
    hall to attempt to diagnose the problem with ROC5 TDCs.

    04:30 - Bryan identified and fixed the problem (NIM level translator
    failed, meaning that the ROC5 TDCs were not getting triggers). Hall
    status being changed to Beam Permit.

    04:45 - Requested 5 microamps for MWDC calibration runs.
    Runs 2226 - 2229 (HV 1350V, thresholds 5, 7.5, 10, 12.5V).
    Runs 2230 - 2233 (HV 1400V, thresholds 5, 7.5, 10, 12.5V).
    Runs 2234 - 2237 (HV 1450V, thresholds 5, 7.5, 10, 12.5V).

    05:55 - beam lost due to accelerator problems.

    06:45 - beam restored to hall. Continue MWDC calibration.
    Runs 2238 - 2241 (HV 1500V, thresholds 5, 7.5, 10, 12.5V).
    Runs 2242 - 2245 (HV 1550V, thresholds 5, 7.5, 10, 12.5V).

    07:40 - BB MWDC calibration runs complete.
    Move target to 6 cm LH2. Turn MWDC HV off. Set prescales for coincidence
    running.
    BB coil current = 390A
    Start run 2246.

    Shift ended during run 2246.