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    User name brads

    Log entry time 00:11:22 on November14,2008

    Entry number 248707

    Followups:

    keyword=BB Cerenkov work and todo list

    I put a spare 5" PMT assembly (PMT + mu metal shield + iron shield) inside a dark box and placed it near PMT 19 of the BB Cerenkov (2nd from bottom on beam-left side of stack).

    The high voltage and signal cable from PMT 19 is now plugged into dark box so the ADC spectrum will be aquired normally. Anything that that PMT sees comes entirely from background (no line of sight to the target and no radiator gas). We can try adding shielding at the next access and see what changes.

    Raised thresholds on the per-PMT signals going to the TDCs only from -30mV to -300mV.

    I also noted that the signal cable from PMT 20 doesn't seem to be transporting a signal through to the ADC. This problem needs to be chased down.