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    User name Ole Hansen

    Log entry time 13:46:31 on July 08, 2010

    Entry number 330809

    keyword=L-arm VDC timing shift with event type

    Here is a comparison of the L-arm VDC u1 drift time spectra for event types 4 (L/R coincidence based on scintillators only) and event type 5 (L-arm singles trigger). For event type 4 only, there is clear evidence of double-timing - part of the spectrum is shifted by ~100 ns to earlier times. Meanwhile, the timing of trigger 5 is very clean.

    Trigger 4 does not seem to be configured very well ... perhaps an expert can look into it?

    (I am doing more replay right now to get enough statistics for trigger type 6 - the one we really want.)

    A copy of this log entry has been emailed to: bogdanw, kalyan

    Figure 1

    Figure 2