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    User name E.Chudakov

    Log entry time 14:36:56 on October 29, 2009

    Entry number 296908

    This entry is a followup to: 296014


    keyword=Moller - helicity signals

    I checked the Moller data in order to make sure that the time structure change of the helicity signals does not affect the Moller results. This change was noticed by Brad Sawatzky on Oct 21 2009. Here is the history of changes:
    1. Before April 2008: the helicity signal edge coincided with the MPS edge
    2. April 2008 - May 27, 2009: the helicity edge came 25 us later than the MPS edge
    3. August 2009 - now: the helicity edge comes 1.5 us later than the MPS edge
    The data (3) looks the same as data (1). The data (2) are different: the scaler trigger latches the previous helicity signal. As far as the Moller analysis is concerned, these changes make no difference. The helicity information is taken from the ADC triggers only (just because of these annoying changes).

    A copy of this log entry has been emailed to: gen@jlab.org, brads@jlab.org, glamazdi@jlab.org, rom@jlab.org