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    User name lkaufman

    Log entry time 08:09:41 on December22,2003

    Entry number 115023

    keyword=Owl Shift Summary

    Owl Shift Summary

    Bodo worked on ep system until 1:15.

    5 uA, Waterfall target, P=1.01 GeV, RICH @ 2120 V

    Run #
    ------
    1531 (short run)
    1532 (RICH tripped)
    1533 (RICH tripped, trying to restore)
    1534 (RICH off)
    1535 (RICH trupped again)

    lowered beam current because RICH detector keeps tripping

    2.5 uA, Waterfall target, P=1.01 GeV, RICH @ 2100 V

    Run #
    ------
    1536 (RICH tripped)

    3:00 - Leave RICH off for an hour and then try again, continue taking data in the meantime.

    2.5 uA, waterfall target, P=1.01 GeV, RICH off

    Run #
    ------
    1537
    1538

    3:51 - Turning RICH HV back on, and trying to run RICH again

    4:00 - 2.5 uA, waterfall target, P=1.01 GeV, RICH @ 2100 V

    Run #
    ------
    1539 (RICH tripped after ~15 min, ramped HV up again)

    4:23 - accelerator down due to RF problem
    4:53 - beam back

    1540 (ended due to accelerator BLM trips and they need to check orbits)
    1541 (RICH tripped again after ~5 min))

    continue to take data without RICH since it keeps tripping off. It stayed on the entire time the beam was down. RICH tripped off after have beam on for ~5 min.
    Run # (w/o RICH)
    ----------------
    1542
    1543
    1544
    1545

    ---------
    7:00 - try to restore previous conditions where RICH was working fine.
    - set spectrometer to P=2.030 and put in thick carbon target.

    7:45 - 5 uA, thick carbon target, P=2.030, RICH @ 2100 V

    Run #
    ------
    1546 (Right dipole still getting to setpoint, but want to make sure RICH is working)

    RICH seems to be doing well here!

    Stay tuned for what will happen next.