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    User name Markowitz

    Log entry time 12:21:17 on June 06, 2005

    Entry number 145312

    This entry is a followup to: 145165

    Followups:

    keyword=T6 efficiency and effect of changing A1 attenuation

    Yesterday evening I changed the A1 attenuation from 0.1 to 0.2, claiming that the signal going into the discriminator was too small and therefore the trigger efficiency was low.

    The final run before I did that was run 4292. From the end-of-run halog entry we see that T6/T3 is about 0.5: Run Number: 4292 TRIGGER RATES: PRES/REAL T3[0] :263.3/26331.4 Hz T6[0] : 0.2/14747.3 Hz

    A subsequent, recent run is 4351. From the end-of-run halog entry we see that T6/T3 is now about .1:

    TRIGGER RATES: PRES/REAL T3[0] :506.5/1519.4 Hz T6[0] : 0.0/155.6 Hz

    This is probably a reasonably good value for A1, but when we switch to kaons we do need to check the trigger effiencies.

    A copy of this log entry has been emailed to: e94-107@jlab.org, rom@jlab.org