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    User name riordan

    Log entry time 07:58:26 on January22,2009

    Entry number 257260

    keyword=Owl Shift Summary

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

    Only one BigBite HV trip this shift and it seemed to be correlated with some weird BPM readings. Otherwise, mostly smooth shift. Roughly 2 hour down for accelerator work. Took production until 05:15 and switched to 3He reference cell. Went to controlled access at 06:40 for BigBite polarity change. Access will continue into next shift.

    00:00 Start shift, run 5428 - 3He at 14 uA in progress
    00:08 End run 5428 - 1M events, 49.9 mC
    00:09 Start run 5429
    00:35 MCC calls to say beam will be off for ARC magnet work
    00:48 End run 5429 - 315k events, 14.7 mC
    02:22 Beam restored - doing beam position checkout
    02:35 MCC wants to run tune beam - moved to empty target
    02:46 restume position checkout
    02:56 spot++ and rates looks good for 3x4 and 6x6 raster
    Resume production - start run 5433, Polarized 3He at 14 uA
    03:41 BigBite MWDC HV Trip - BPMs went to bad positions
    End run 5433 - 611k events, 30.8 mC
    03:45 Start run 5434 - 1M events, 50.3 mC
    04:50 Start run 5435 - 396k events, 19.9 mC
    05:15 Stop run - putting 3He reference in beam and starting tuning
    05:37 Start run 5338 - Reference cell (unpolarized) 3He at 14 uA
    06:40 Stopped run 5338 - 898k events, 46.9 mC
    Going to controlled access for BigBite polarity change
    07:30 Techs in the hall starting work