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    User name Owl shift

    Log entry time 08:10:03 on April25,2009

    Entry number 268251

    keyword=Shift summary

    Shift leader: B. Zhao
    TO: J. Huang
    3rd: H. F. Ibrahim

    0:00 take over the shift, requesting a controlled access for Bryan to change a cable.
    0:45 Bryan finished the work. Call MCC to request beam permit.
    01:00 Since beam is restored after a long down time, Call MCC to ask for 5 uA beam on empty target.
    01:30 MCC called and said they had a problem of injector HV. They had called the expert to fix it.
    02:10 Beam is back and call MCC to fix the 1H04A.xpos since it is in 0, not -0.5 we expect.
    02: 20 Move target to carbon, turn on MWDC and ask MCC to do a harp scan.
    02:50 Harp scan is done and start raster size scan. Call MCC ask for 2X2 and the real size seems 1.1 X 1.6, not 1.2 X 1.2 in seperate log
    208698.
    03:00 Ask for 4X4 raster size and the real size is about 2 X 3; for 6X6, the real size is about 3 X 4.
    03:15 Raster off, 2 uA, carbon target, 1M events run for L-arm, also R-arm.
    03:30 set momentum at 1.1759 GeV for both arms and take data for half an hour.
    04:00 change to Hydrogen reference cell and check T3 rate for 2X2 and 6X6 raster, around 4.3 KHz. Then set momentum = 1.2112 GeV on both arms.
    05:10 finish power cycling of Q2 and Q3 for both arms to get 1.2112 GeV momentum, then start cross calibration runs and may take data about 2 hours.
    06:30 change momentum to 1.1759, take data for 1.5 hours.
    08:00 change momentum to 1.1406.