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    User name Templon

    Log entry time 07:18:40 on June 5,2000

    Entry number 43154

    keyword=compton dipole change

    Compton DAQ showed beam "y" position out of limits (desired value = 300).
    Called MCC and after some discussion, decreased compton dipole setting
    by 200 Gauss-cm. This brought position back into line.
    .
    Notes: the MCC did not know what this y position was; they had no BPM
    which gave a comparable reading. Is this a computed y position? If so,
    perhaps it is better for the GUI to read "computed Y at compton vertex"
    or somesuch. Also, it will be nice to have some documentation about
    what we should ask the MCC to change, and how that change relates to
    position error (i.e. is an increase in y caused by an increase or decrease
    in compton dipole setting?) Is there such documentation?
    .
    This change was made immediately prior to run 1804.