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    User name ellie

    Log entry time 14:40:06 on May 19, 2009

    Entry number 274789

    This entry is a followup to: 274124

    keyword=HAND V-22L ADC/TDC Problems Revisited

    I spent some time trying to track down the ADC/TDC problem on V-22L.

    It stopped working on Run 21247 which occurred at approximately 4am on
    Sunday. The problem started after bringing the HAND HV back on after
    doing a Beam Check-Out/Recovery Procedure. The problem remained until
    Sunday afternoon at just after 4pm. It started working again in Run
    21273. There are no HALog entries around that time involving the HAND. I
    checked through the HV lists in the Start of Run scripts for all of the
    runs during that time. For V-22L they all read -1051. I turned the HV off
    on that bar and turned it back to see if it had a problem recovering
    because of the HAND being turned off and back on for the beam recovery
    procedure. It came back on without problem. At this point it seems to be
    up and running again and I have been unable to reproduce the problem.