• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name X. Zheng

    Log entry time 16:00:32 on May 5,2007

    Entry number 201071

    keyword=day shift summary

    8:17-8:23 After run 3160, MCC performed beam position lock calibration.

    8:30 CW beam back, (-2.25,+1) at BPMB, but not straight.

    10:00 Asked MCC to tune the beam position to (-2.25,+1) at both A and B. We got (-2.1,+1) for A and B after 30 minutes of tuning. First run at this position is #3165.

    11:40 got a beamline LeCroy HV alarm for CH0 and CH1 (one of them or both) on the first (e,p)&ARC column. Set HV is -1200V for CH0 and -600 for CH1, respectively. Measure HV is 0 for both. Turning either one back to ON triggers the alarm again. Nobody knows what it is for so we left them at OFF.

    12:43-13:02 beam magnet problem/trip, run 3169 ended early with 1.20M events;

    13:17-14:22 same beam magnet problem;

    15:00 MCC need to turn on one higher pass magnet, estimate 20min beam off;
    16:00 beam still not back.