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    User name silwal

    Log entry time 06:20:40 on September 12, 2009

    Entry number 289200

    Followups:

    keyword=boiling studies, owl shift

    Here is a list of things we did during the owl shift:
    1. Harp scan, the beam size is
    BPMA 278 x 62 um
    BPMB 310 x 150 um
    2. spot ++ on carbon holey target @ 5 uA(# 24692, 24693), centered the
    beam at
    BPMA -0.2 0.8
    BPMB -0.8 2.1
    raster size 11x8.5(MCC) - 6x4.5 mm at the target
    3. spot ++ on LH2 target @ 5 uA (# 24694, 24695), same BPM positions and
    beam raster size.
    4. run # 12238: left the unser in adc22_1 (could not find any other adc
    with higher gain). ramped up/down between 70-100 uA. and also sat for ~ 2
    minutes @ 90,80,70,50 @ 30 uA. NOTE: BPM FFB was on autogain for this.
    4. run # 12240: BPM FFB on manual gain. took ~ 12000 good pairs @ 100,
    80, 60 and 40 uA. Changed the lobeamcut to 5000 for this run. Saved the
    target parameters from this run in hacuser/StripTool/Happex3/
    Only the target parameters from 3:23 am apply for this run, this was when
    we started the run.

    I have not really looked at the data carefully. The spot++ results seem
    to suggest that the beam is fine, and is not scraping off the walls of
    the target. The boiling width at 100 uA are still high, ~ 1400/1500. I
    will look at the data carefully after I get some sleep. The target data
    folder has the actual data points of some of the target parameters that
    we could use to recreate the target stripcharts.


    A copy of this log entry has been emailed to: paschke@jlab.org, rom@jlab.org, dalton@jlab.org, kkumar@physics.umass.edu, souder@physics.syr.edu