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    User name V. Sulkosky

    Log entry time 10:51:02 on February 2,2009

    Entry number 258684

    This entry is a followup to: 258581


    keyword=Gas Cerenkov PMT #6

    The left gas Cerenkov PMT #6 ADC appears to have started to have
    problems with run 5745 (taken on Saturday afternoon). The first
    symptom was that the single photoelectron peak shifted from channel
    160 to about 110. I looked through most of the production runs
    starting from this period and I have seen that the problem is
    intermittent. For example, Figure 1 shows the ADC amplitude for this
    PMT from run 5792, which matches the golden run very well. Then in
    Figure 2 is the spectrum from run 5795, which shows a amplitude

    I haven't seen any change in the TDC spectrum for this PMT. The
    intermittent behavior leads me to believe that the problem might be do
    to a flakey cable. During the beam studies tomorrow, I will look
    into this possibility.

    FIGURE 1

    FIGURE 2