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    User name dhamilton

    Log entry time 08:11:23 on April 02, 2008

    Entry number 229524

    keyword=Owl Shift Summary

    Started shift during run 2147 (optics run with sieve slit on LH2 target,
    BB HV off).

    00:25 - Run 2147 ended.
    Q2 and Q3 current set to 0A, then cycled through 1400A.

    00:45 - Optics run 2148 (following Q2 and Q3 power cycle) started.
    T3/T7 rate is 200Hz/65Hz at 13.6 microamps.

    01:15 - Run 2148 ended.
    Target moved to Carbon foil.
    BB E and dE HV switched on (MWDC also switched on at 1500V at Nilanga's
    request).
    Beam at 5 microamps.

    01:32 - Run 2149 started.
    E-dE plots checked.
    Discriminator thresholds changed.
    HV changed.
    Several iterations over runs 2149 - 2163.
    Run 2162 had MWDC HV set to 1300V.
    Run 2163 had MWDC HV set to 1350V.

    06:05 - target moved to LH2.
    Prescales set for coincidence running.
    1 microamp requested from MCC.
    Run 2165 started.

    06:10 - HV trip and problems with ROC5.
    Problems fixed. Start run 2166.

    06:50 - problems with ROC5 again. Increased beam current to 3 microamps
    in an attempt to stabilise the beam position. Started run 2168.

    08:00 - continued elastic data-taking, with small changes to the
    discriminator thresholds. Problems with ROC5 persist.