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    User name Nanda

    Log entry time 19:18:05 on May 5,2003

    Entry number 100244

    keyword=Compton

    At 1.5 GeV, the background rate in the compton polarimeter are about 200 kHz with 4 uA beam in A and (40uA in C). The expected compton interaction rate is 4Kz. There is no hope of running the compton with such poor beam quality.

    There is also a good correlation between Hall C beam and compton background rate.
    With Hall C off, the rate drops to 100 KhZ. Hall C leakage causes a factor or 2 increase in background rate.

    The beam profile on tgt OTR is sigmaX=0.30 and sigmaY=0.45, with tails in Y.
    Its a big beam spot.

    We will try the compton after enegry change with 2 pass beam to A.