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    User name X. Zhu

    Log entry time 12:14:23 on April20,2001

    Entry number 60959

    keyword=Gas Cerenkov test

    1.00 Switching the polarity of the right arm to start the test
    Both spectrometers negative polarity; 2.5 GeV, at 30 degrees
    run # ~3724: prescale factors not correct;
    3:48am: run #3725 left arm cherenkov test, 2.5 GeV/c, 10microA;
    4:05am: MCC called, beam off 10 min for QE measurement;
    4:21am: run #3726 left arm cherenkov test, 2.5 GeV/c, 15 microA;
    4:42am: run #3727 left arm cherenkov test, 2.5 GeV/c, 30 microA;

    5:46am: run #3729 left arm cherenkov test, 1.0 GeV/c, 30 microA;
    5:58am: run #3730 left arm cherenkov test, 1.0 GeV/c, 30 microA;

    the regulator for the right arm dipole were switched on, and the dipole works fine now;

    6:28am: run #3733 right arm cherenkov test, 2.5 GeV/c for right arm and 1.0 GeV/c for left arm , 30 microA;
    6:33am: run #3734 right arm cherenkov test ,2.5GeV/c for right arm and 1.0GeV/c for left armm , 30 microA;
    7:20am: run #3739 right arm cherenkov test ,2.5GeV/c for right arm and 1.0GeV/c for left arm , 30 microA;

    7:45am: change central momentum of right arm to 1.0GeV/c;

    7:43am: run #3741 left arm cherenkov test, 1.0GeV/c;
    7:55am: run#3742 left arm cherenkov test ,1.0GeV/c;
    8:00 am : run#3743 left arm cherenkov test ,1.0GeV/c;
    8:05am: run#3744 left arm cherenkov test ,1.0GeV/c;

    prescale were changed back from 40 to 45 due the high rate problem caused in daq system.
    run#3745-run3752 left arm cherenkov test ,1.0GeV/c;

    10:01am: run#3753 both arms at 1.0GeV/c , cherenkov test;
    10.15am: changed high voltage for L-pr1-ch3 :1625->1675
    L-pr-ch14:1434->1404

    10:26am: run#3755 both arms at 1.0GeV/c cherenkov test;
    10:49am: change left arm from 1.0 GeV/c to 2.0GeV/c
    10:49am: run#3756 right arm cherenkov test at 1.0GeV/c
    11:14am: run#3757 right arm at 1.0GeV/c and left arm at 2.0GeV/c
    11:33am: run#3758
    11:52am: run#3759

    12:00pm The beam has shut off.
    12:03pm run #3760: ped run, wrong prescale factors;
    12:05pm run #3761: pedestal run.