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    User name V. Sulkosky

    Log entry time 13:22:42 on April 23, 2009

    Entry number 267540

    This entry is a followup to: 267484

    Followups:

    keyword=Re: Strange raster current readback for run 1254

    I think I understand the strange raster pattern seen on the L-HRS for run 1254. This run has only 78: T3, T4 and T8 events out of 70 k events. The rest of these events have to be T2 triggers from the BigBite scintillator E-plane or maybe it's the dE-plane.

    It seems that there is some strange readout of the raster currents with the BigBite trigger. For run 1257, which only had L-HRS triggers, the raster pattern looks normal.

    Hence if we want to check the beam profile and raster size, we should make sure we only use L-HRS triggers for the time being or run the R-HRS DAQ, which does not have any other triggers. However the beam positions from the R-HRS have not been calibrated for over a year now.

    A copy of this log entry has been emailed to: brads,rom