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    User name jpchen

    Log entry time 16:06:11 on April14,2008

    Entry number 232040

    keyword=Day shift summary

    Day shift summary:

    Shift workers: J. P. Chen (SL), J. Udias (TO), O. Hansen (3rd).

    8:00 production data taking on kinematics E:
    BigBite at 48 degree, 390 A, HRS_L at 12.5 degree, 1.007 GeV.
    2.4 uA on LH2. Each run 1 M.
    ROC5 warning messages.
    9:00 deadtime went too high (from ~10-17% to 23%), run 3002,
    Rebooted ROC5. Restarted coda.
    9:05, deadtime still high (run 3003), hadr reboot ROC5. then reboot.
    9:23, beam trip (BPM drift) caused Big Bite HVs tripped off. (run 3004). Reset all by 9:31.
    9:41, Beam current fluctuating, beam current increased to 2.9 uA, caused deadtime to increase to ~20% run 3005). Requested to lower back to 2.3-2.4 uA. (Hall C doing Moller since ~9:00).
    12:58 deadtime jump up, ROC5 problem, run 3021. rebooted.
    15:32 reuqested controlled access to switch gas bottle for BigBite chambers.
    15:50 Controlled access complete, Jack changed gas bottle for BigBite chambers. One bubbler bubbles frequently now. Another still not.
    15:55 MCC called to inform us that they are starting work on RF, expect ebam by 16:30.


    run 2997/2998/2999/3000/3001, good runs. 1M.
    run 3002, deadtime high, stopped short run. ROC5 rebooted afterwards.
    run 3003, deadtime still high, hadr-reboot ROC5, then reboot.
    run 3004, stopped due to BigBite HVs trip.
    run 3005, beam current increased from 2.4 to 2.8 uA, caused deadtime increase (near the end).
    run 3006, beam current fluctuate 2.2-2.8 uA. 1M.
    run 3007/3008/3009/3010/3011/3012/3013/3014/3015/3016/3017/3018/3019/
    3020. good runs, 1M.
    run 3021, deadtime jumped up, ROC5 problem. Rebooted.
    run 3022/3023/3024/3025/3026/3027/3028/3029/3030/3031/3032/3033, good runs, 1M.