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    User name M.Shabestari

    Log entry time 08:39:10 on April 9,2008

    Entry number 230901

    keyword=Owl Shift Summary

    Owl shift summary April 9, 2008

    SL : Mitra Shabestari
    TO : Mitra Shabestari
    3rd : Khamit Ardashev


    pi0 Production : Kinematics B
    BigBite = 54 degrees, LHRS = 16.5 degrees.



    00:00 Shift started with no beam due to accelerator problems.The problem is because of the failure of the power supply unit on the arc 1A magnet.

    01:00 : MCC called and they are going to test the beam.
    01:18 : MCC called. He said they had finished testing, and beam would be ready.
    Beam was not stable at the begining.

    ----- : Moved target to BeO
    ----- : Asked MCC to perform harp scan
    ----- : Moved to empty target
    ----- : At 5uA T1 = 1.256e04 Hz, and T2 = 2.793e04 Hz
    ----- : Moved target to Carbon with hole
    ----- : At 5uA T1 = 1.238e04 Hz, and T2 = 2.722e04 Hz
    ----- : Moved taget to LH2
    02:59 : Started production data
    03:02 : Run# 2590 (1 M); First production run of this shift
    03:10 : Run# 2591 (1 M)
    03:20 : Run# 2592 (1 M)
    03:29 : Run# 2593 (1 M)
    03:41 : Run# 2594 (1 M)
    03:48 : Run# 2595 (1 M)

    The rate is high in T2. It is 1.334e06 Hz.Adjusted prescales. Deadtime is ~30%

    03:55 : Asked MCC to adjust the BPMs
    03:58 : Run# 2596 ; ROC5 error
    04:00 : ROC5 error. Rebooted Roc5
    04:04 : Run# 2597; stopped the run to adjust the dE threshold.
    ----- : Changed threshold set values for both dE(tdc) and dE(trigger) from previousely set 200 to 280.T2 rate looks fine and deadtime is about 13%
    04:15 : Run# 2598 (1 M)
    04:28 : Run# 2599; JUNK
    ----- : HV gui lost communication. Restarted hvgui
    04:46 : Run# 2600; ROC5 crashed. Soft reboot didn't help. Harebooted ROC5.
    04:47 : HV gui lost connection. Restarted hvgui.

    From this point on all data are good ones.

    05:01 : Run# 2601 (1 M)
    05:12 : Run# 2602 (1 M)
    05:25 : Run# 2603 (1 M)
    05:36 : Run# 2604 (1 M)
    05:49 : Run# 2605 (1 M)
    06:00 : Run# 2606 (1 M)
    06:12 : Run# 2607 (1 M)
    06:26 : Run# 2608 (1 M)
    06:43 : Run# 2609 (1 M)
    06:54 : Run# 2610 (1 M)
    07:06 : Run# 2611 (1 M)
    07:19 : Run# 2612 (1 M)
    07:31 : Run# 2613 (1 M)
    07:44 : Run# 2614 (1 M)
    07:54 : Run# 2615 (1 M)
    08:08 : Run# 2616 (1 M)
    08:24 : Run# 2617 (1 M)