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    User name M Jones

    Log entry time 02:12:03 on August 20,1998

    Entry number 640

    Followups:

    keyword=Increase carbon door thickness

    In March commissioning run we found that at proton kinetic energy
    800 MeV increasing the carbon thickness from 41.9 to 49.5 cm
    did make a difference in the scattering efficiency. To verify this
    we put the carbon doors in for run 2701.

    Run Carbon Carbon eff. Mult. Scat angle % of zero hits
    --- ----- ------- ----------- ---------
    2700 41.9 .34 (.20) 1.0 deg .27
    2701 49.5 .35 (.20) 1.1 deg .32


    The first number in the carbon scattering angle is 3 degrees or larger and
    the second is between 5-20 degrees. There is no improvement
    but no harm so we decided to leave all the carbon in.