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    User name fraile

    Log entry time 08:02:01 on March30,2006

    Entry number 168887

    keyword=Owl shift summary 30mar06

    OWL SHIFT SUMMARY 30 March 2006

    0:19 Beam stopped for 3He target tests.
    Raster ON.
    3He polarization measured.
    0:48 Ask for beam 2uA on 3He target, testing raster.
    For the moment HVs for S10, S13 are still off.
    Raster shows clear inhomogenety, hot spot on botton left side.
    1:13 HV turned on now, no spikes...
    1:18 Taking data under the above conditions. Run 3494 started.
    1:38 Reducing current to 1 uA to examine the raster.
    1:43 Raster size increased to 4x4 mm2, still inhomogeneous.
    It cannot be fixed now. Run 3496 started.
    2:00 HAPPEX shows extreme Aq value, raster size reduced to 3x3 mm2.
    2:09 Start run 3497.
    2:20 Raster reduced to 2x2 mm2, Aq still ~-28000!
    Continue data taking under these conditions, 1 uA 3.29 GeV e- beam onto 3He polarized target, raster size 2x2 mm2.
    3:05 Start run 3498.
    3:19 lambda/2 OUT. Start run 3499.
    4:12 Stop for target polarization measurement.
    4:22 Run 3500.
    5:30 Run 3501.
    6:03 Beam intensity increased to 2 uA. Run 3502.
    The beam asymmetry becomes normal, Aq<100 ppm.
    7:15 Beam intensity increased to 3 uA, run 3503.
    7:30 Beam intensity increased to 5 uA. All wire chambers HV from
    S10 and S13 tripped but recoverd. No spike in the T2 scintillator trigger.
    Raster image from the BPMs looks better, it improves with beam energy.
    7:40 Beam current increased to 7 uA.
    Everyting looks ok. HV fine, no spikes in T2.
    New run 3504.
    Running...!