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    User name Jin Huang

    Log entry time 22:39:04 on July 05, 2010

    Entry number 330340

    This entry is a followup to: 330328

    Followups:

    keyword=Optics Check: more check for sieve-in run with T6 trigger

    More study is done on RHRS sieved run with positron cuts. Still no luck...
    
    Tried:
    * full dp, small dp (+-0.5%), smaller dp (+-0.2%)
    * use sieve out run to select good vz region then repeat study
    * shift central of small dp window to +- 1%
    * optimize binning. 
    
    An example is shown below, which is cut on |dp|<0.2%. Besides, black line
    on bottom right plot is cut on vz:tg_ph correlation, extracted from sieve
    out runs. As you can see, vz has expanded significantly around this
    region (due to multiple scattering and conversion?). Expected sieve holes
    diameter is couple pixels.
    
    


    A copy of this log entry has been emailed to: riordan, vasulk, schuster@slac.stanford.edu, ntoro@stanford.edu, bogdanw, yqiang



    Run 1769+1770