[Halld-pid] Time-of-Flight Meeting Minutes, November 8, 2012

[Mark M. Ito]

Find the minutes below and at

 
https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_November_8,_2012#Minutes
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GlueX TOF Meeting, November 8, 2012
Minutes

    Present:
      * FSU: Sasha Ostrovidov
      * JLab: Mark Ito (chair), Tim Whitlatch, Beni Zihlmann

PMT Testing

    The second batch of PMTs was received at FSU. Sasha has completed the
    complete set of tests (at least those that have been used up until now)
    on batch 2. They look good: single-photoelectron peaks are visible and
    the measured gain agrees well with those on the Hamamatsu data sheets.

    The cathode light sensitivity measurements are still being developed.
    Sasha has been testing stability of a UV LED and sees day-night-like
    variations of up to 10%. Beni suggested trying to use a reference tube
    to correct for variations in LED brightness. Also Mark noted that if
    the variation is strictly due to temperature, a direct temperature
    correction might be sufficient. Sasha will start with the reference
    tuber approach.

    Testing of th tubes now goes at the rate of ten per day. There is a
    student working with Sasha, with testing shifts taken by each.

    Sasha is working on bringing up a LeCroy 1458 mainframe system for
    computer control of the high voltage. Mark will try to find a manual to
    send to him.

    Retrieved from
 
"https://halldweb1.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_November_8,_2012"

-- 
Mark M. Ito
Jefferson Lab
marki at jlab.org
(757)269-5295