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    User name xqian

    Log entry time 02:05:23 on February 16, 2009

    Entry number 261414

    This entry is a followup to: 261389


    keyword=Some naive thinkings

    1. The shift in coincidence cut 2 is probably because the signal is a little bit out of the ADC gate. I guess the best way to look at it is to select good events in the adjacent mirror to see this effect. It is not convincing to me that they are the events hitting other mirrors.

    2. The FASTBUS 1881 ADC resolution is 50 fC/channel. The VME 791 is 0.1pC /channel. I guess the number of channel should be divided by 2 for the new ADC, right? (Brad may comment on this) Thus, the 1 photon peak should be 60?

    3. One should plot DBB.BBcerT06 vs DBB.t2. In this case, a clear correlation can be found. Since, the data are mostly from T2. Most likely the events in the coincidence timing 2 region is random coincidence (but give the trigger, since the T6 generate the gate and cerenkov signal define the timing). The first peak should be coincidence, I guess.

    A copy of this log entry has been emailed to: yqiang@jlab.org,brads@jlab.org,meziani@jlab.org