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    User name jiang

    Log entry time 21:55:37 on August 14,1998

    Entry number 204

    This entry is a followup to: 203

    keyword=Helicity scheme elogs

    Some machine ops e log entries related to the helicity elog #203 in hall a logbook...

    For helicity scheme changes, please refer to the MCC log entries #49157

    Included here:
    -------------------------------------------------------
    User name Hansknecht

    Log entry time 19:04:02 on August 14,1998

    Entry number 49157

    keyword=helicity controls

    The helicity controller has been replaced with a newer improved unit. The Halls are receiving two signals: "HELICITY" and "CLOCK". The
    helicity signal is a real time indication of the helicity being produced by the source. The clock signal is the line locked source for helicity state
    decisions. Helicity state changes will occur during the rising edge of the clock signal. The controller is set in the pseudo-random mode at .5
    hz. 5 MeV Mott measurements can now be done in the pseudo-random mode.

    -------------------------------------------------------
    Please also see MCC log #49156 as included below:


    Entry number 49156

    keyword=Mott Measurements Injector Tune Entry

    Performed bunchlength procedure before beginning Mott.
    Mott runs completed 1810. Someone realized the present setup provides longitudinal polarized electrons to hall C and B (not A). Discussion
    ensued about making a spin change to be longit. to C and A. 1845: restoring beam to C, Chao checking locks.



    Downtime = 16:00 Uptime = 16:00 Restoretime = 19:00
    System = Injector Location = PGUN Device = MOTT
    Cater # ______