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    User name Jin Huang

    Log entry time 13:38:47 on June 27, 2010

    Entry number 328750

    This entry is a followup to: 328559

    keyword=Optics Check : Sieve OUT runs

    I cam in the noon to check quality of optics runs without sieve.
    
    Runs with dp = 0% and dp=-2% looks fine. Example plots are attached.
    However, since dp = -4%, only HRS momentum was lowered while septum
    momentum remains at setpoint of dp=-2%. 
    
    Further check on match between HRS momentum and septum momentum was
    performed as 3rd plot. There was two mismatch periods:
    
    * Jun 27, 6:15AM - 6:30AM: No data was taken;
    * Jun 27, 10:44AM - noon shudown: dp = -4% and -10% runs have this
    problem which are not useful for optics calibration. But they are still
    good for detector check out. In the end, we still have sieved -4% and
    -10% data to calibrate optics in this region. 
    
    
    


    A copy of this log entry has been emailed to: ntoro@stanford.edu, camsonne@jlab.org, vasulk@jlab.org



    Run 1212: dp = 0%



    Run 1241: dp = -2%



    GREEN: HRS p set point; Blue: septum current