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    User name D.Wang

    Log entry time 08:44:19 on October24,2009

    Entry number 296426

    keyword=compton test runs summary

    03:35 Edet moved to -3.0 mm
    changed FADC trigger to Etrigger.

    run20647 electron only run to check beam, FADC triggered on electron. Data shows the beam didn't move.

    03:50 changed Polar gate to 20ms to take coincidence runs
    03:51 moved Edet to 7.5 mm to take coincidence runs for studying the bump.

    run20648 coincidence run at 7.5 mm. short run. In the h7 tree, most of the events come from the bump, but there's still a little bit compton events. So we can move the Edet a little further from the beam.

    04:07 moved Edet to 7.8 mm.

    run20649 coincidence run at 7.8 mm. 30 mins.
    run20650 coincidence run at 7.8 mm. 30 mins.

    photon background increased at about 05:12, not sure what happened.

    05:22 moved Edet to -3.0 mm.

    run20651 coincidence run at -3.0 mm. beam current 100uA.

    06:30 called MCC to change beam current to 75 uA by closing the slits

    run20652 coincidence run at -3.0 mm. beam current 75 uA. background increased for the later 15 mins.

    07:22 did coda reboot
    beam comes back after a 5 mins trip, background looks fine again.

    run20654 coincidence run at -3.0 mm. beam current 75uA.

    08:20 called MCC to increase the beam current to 100 uA by openning the slits.

    FADC trigger changed to standardRun
    Polar gate changed to 27ms
    Moved Edet to garage.

    run20655 photon only run.

    Will take photon data for a while.