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    User name D.Wang

    Log entry time 03:49:51 on October16,2009

    Entry number 295166

    keyword=compton test runs

    Beam current 92 uA.
    run20430 moved electron detector to 2 mm. FADC triggered on electron. 2 plane coincidence. electron background looks ok.

    run20431 moved electron detector to -4.0 mm. FADC triggered on electron. 2 plane coincidence. electron rate is about 110Hz/uA with laser off and 210 Hz/uA with laser on. from the strip hit plot, the compton edge is at 36 strips. which is the same as -2 mm. So maybe the detector cannot go any further than -2mm.

    run20432 moved detector to -2.0mm. beam tripped.

    run20433 detector at -2.0 mm. Other conditions stay the same. Rates and the compton edge are basically the same as run20431. So the detector probably cannot go further than -2.0mm.

    roc 1 and 2 hung. did coda reboot

    run20434 tried -4.0mm again just to make sure. same as run 20431 observed.

    run20435 Edet at -4.0mm. 3 plane coincidence. electron rate is about 15 Hz/uA with laser off and 40 with laser on.

    MCC called in. Beam will be gone for a while. Not sure how long it will be. Will resume production when beam comes back