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    User name Markowitz

    Log entry time 01:00:32 on June 19, 2005

    Entry number 146531

    Followups:

    keyword=A1 aerogel PMT

    We had an opportunistic access to the left HRS during the accelerator hall A access. Looking at the A1 PMT 10 (11th channel) which is dead in the histograms (both ADC and TDC), I found there was no significant signal on the oscilloscope. Turning up the HV in small increments to 2900 did not improve things much. [The signal became visible but had a small amplitude. The current drawn went to a "normal" value of 500 at 2900 V.]

    The tube appears bad. Turned the HV back to previous, and left the hall. When we have a chance we should replace the PMT (monday or tuesday this week, as soon as a new tube is prepared).

    A copy of this log entry has been emailed to: mandrox@jlab.org, bogdanw@jlab.org