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    User name riordan

    Log entry time 07:59:47 on January21,2009

    Entry number 257098

    keyword=Owl Shift Summary

    Leader: Seamus Riordan
    Target: Al Tobias
    Worker: Xinhu Yan

    Had about 1 BB MWDC HV trip/hour this shift. Just before 06:00 we asked them to decrease the ramp up rate after beam trips to see if that would help. We have not had any HV trips since, so it looks like it may have solved the problem.

    00:00 Start shift, run 5396 - 3He at 14 uA in progress
    00:55 End run 5396 - 1M events, 50.0 mC
    Start run 5397 - 1M events, 50.0 mC
    02:06 Start run 5398 - 3652 events, 0.1 mC
    02:07 BigBite drift chamber HV trip - resetting
    02:12 Drift chamber HV restored - start run 5399 - 100k events, 5.4 mC
    02:20 Another drift chamber trip - resetting
    02:24 Start run 5400 - 1M events, 49.7 mC
    03:35 Start run 5401 - 240k events, 12.0 mC
    03:51 BigBite drift chamber HV trip - resetting
    03:56 Start run 5402 - 970k events, 49.1 mC
    04:58 BigBite drift chamber HV trip - resetting
    05:03 Start run 5403 - 650k events, 32.7 mC
    05:45 BigBite drift chamber HV trip - resetting
    05:51 Start run 5404 - 1M events, 50.1 mC
    06:56 Start run 5405 - continue into next shift