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    User name V. Sulkosky

    Log entry time 08:51:42 on October 26, 2007

    Entry number 209683

    This entry is a followup to: 209636

    keyword=NaI Channel 255

    I looked into the no counts in histograms for channels 155 and 255. It
    looks like the problem with 255 is database related. According to the
    database, the first channel in each group of 16 is not used. I saw in
    the database that in the last set of 16 (crate 4, slot 20, channels
    32-47) that channel 32 was used. Hence the map provides 271 ADC channels
    for 270 actual channels. If I change the last line for the NaI database from

    Crate, Slot, First, Last ADC channels of blocks
    4 20 32 47

    to

    4 20 33 47

    Channel 255 now has counts. See attached plot. A NaI detector expert,
    should confirm the detector map. NaI channel 155 (crate 4, slot 18,
    channel 37) is in the middle of a set of 16 ADC channels (32-47). This
    channel could possible be bad and needs to be checked.

    A copy of this log entry has been emailed to: camsonne@jlab.org,yoomin@jlab.org,xyan@jlab.org,brads@jlab.org



    Figure 1

    CSR_1266-udb.ps