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    User name silwal

    Log entry time 08:27:53 on September 1,2009

    Entry number 287329

    keyword=owl shift summary

    00:45 target moved to thick tantalum for dithering studies. requested tune beam. 3 uA of tune beam.
    1:15 beam modulation scripts activated. ion chamber reading not changed much. bpms downstream of the C10 magnets monitored by MCC, no noticable changes. electron det strips on the beam line. MHF1C08H/V, MHF1C10H/V @ 50 mA.
    1:45 back to CW beam, 5uA. beam modulation script ran, but the HallA FFB "RF on" was not paused during dithering. so no noticable bpm changes. script needs to be changed. will excercise dithering again tomorrow!
    1:55 back on hydrogen target, 60 uA beam.
    2:30 dithering turned off. did not realize that it had been on all the while!
    3:30 the PITA voltages were almost pegged at 9.9/4.9 by the charge feedback enabled. not sure why they asymmetry changed so much. so disabled the charge feedback, and reset the PITA voltages to 8.5/6.2. started run # 11842.
    4:30 charge feedback turned back on. run # 11843 started. PITA voltages setpoints around 8.5/6.2 and stable.
    6:15 LED pulser scan in right arm det. run # 11844. 2 cycles of 1 sec toggle for 20 sec at each baseline freq. diff freq ~ 5 KHz. baseline freq 7-750 KHz.
    8:10 charge feedback turned off! feedback is increasing the asymmetry, went from close to 9 to about 200 at the end of run # 11847.