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    User name paschke

    Log entry time 08:02:41 on September 26, 2006

    Entry number 185352

    keyword=Owl Shift Summary

    Owl Shift Summary, Sept 26, 2006

    00:00 continuing kinematics 12b with run 5200/25200. LD2, 10 uA
    Left p0 = 0.59150, theta = 56.0 degrees
    T3 is low (about 75 Hz)
    00:15 went to 25 uA, since T3 rate is so low. Started run 5201/25201.
    changed prescaler values for T1,T2 to get near 1 kHz, and
    changed T4 to get near 100 Hz (even though T3 is only 180 Hz or so).
    We didn't take the current higher based on advice from expert,
    although we are not rate limited or cooling power limited
    (and the board says 30 uA).
    I estimate about 58% of all triggers are T3.
    00:25 The only coffee to be found in the back room is decaffinated.
    There was a day and a time when decaffinated coffee in the counting
    house would lead to violence. I'm just sayin'.
    02:10 Moving to 4 cm Al dummy. Starting run 5203/25203.
    Adjusted prescale for T1, T2, and T4.

    02:45 Ended 12b, changed left p0 -> 0.51937 for 12c. stayed on 4cm Al.
    03:00 Momentum finally settled. Changed T4 ps = 7, started kin 12c, Al.
    Runs 5204/25204 - 4cm Al.
    03:15 moving to LH2 target. Lowered current to 10 uA, changed ps
    T1 = 3, T2 =3, T4=1. Run 5205/25205
    I screwed up the right arm prescales. ended run, restart Left arm
    T1= 33, T2 = 3, T4 =1. Run 5206/25206
    Lowered current to 6 uA, since left arm deadtime was high (>15%).
    -> Run 5207/25207
    04:00 Lowered current to 4 uA, since left arm deadtime was still high (~11%)
    -> Run 5208/25208
    04:25 Went back to 4cm Al to make sure that we had low deadtime Al data
    for this kinematic point.
    -> Run 5209/25209

    05:10 Ended run. started change to kin 13a.
    05:20 Requested a controlled access to check the path of the spectrometer
    to 69 degrees. In particular, we were worried that the mobile staircase
    may be "locked" rather than rolling.
    06:00 Completed move and momentum change. Requested 25 uA on Ta target.
    Run 2510/25210

    06:26 Requested beam position be recentered at 0.0 mm in the vertical.

    07:10 Ended run on Ta target, requested move to C target.
    07:17 started run on C target: 5211/25211

    Ended shift continuing run on Carbon (go until 09:17).