[Halld-pid] GlueX TOF Meeting Meeting Minutes, Mar. 18 '11

[Mark M. Ito]

Find the minutes at 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_TOF_Meeting%2C_March_18%2C_2011#Minutes 
and below as text.

   ==

GlueX TOF Meeting, March 18, 2011
Minutes

    Present:
      * FSU: Sasha Ostrovidov
      * JLab: Eugene Chudakov, Mark Ito (chair), Elton Smith, Sascha Somov,
        Simon Taylor, Tim Whitlatch, Beni Zihlmann


Review of minutes from the last meeting

    We went over the [31]minutes from the March 4th meeting.
      * Sasha O. received the new F1 TDC that Beni sent to FSU. He sees the
        same set of multiple peaks with the new one that he observed with
        the old one. In addition both TDC's are seeing hits in channels
        that are not connected to anything. Sascha S. had a couple of
        recommendations:
          1. Send email to Ed Jastrzembski with symptoms.
          2. Look at the pulse width, verify that it is at the expected 50
             ns.
      * FSU is still waiting for the 25-ps-least-count TDC from CAEN. See
        [32]Paul Eugenio's email.
           + Sasha S.[?] pointed out that the CAEN TDC needs to be looked
             at from DAQ point of view, i. e., clock distribution, trigger,
             etc.


Light guides

    Beni pointed out the [34]wiki page he is putting together to collect
    information on the light guide design. It summarizes a lot of the
    discussions we have had over the past few meetings and includes
    relevant drawings of conceptual designs.

    Elton thought that we probably should try to simulate light collection
    for the various ideas. He has a program that will do that; he agreed to
    help Beni get started using it.

Detector rates and PMT performance

    Beni showed another [36]wiki page he is that addresses the problem if
    high rates on the innermost, long TOF counters. Sascha S. reminded us
    of the [37]note that he wrote that estimates these rates for the TOF as
    well as for other detectors.

    Sasha O. reported that at one point, due to a light leak, he observed
    rates of around 5 MHz in one of the counters. Signal characteristics at
    that high a rate is a question.

    Elton thought that to reduce the load on these PMT's we may have to
    have amplifiers on them so that they can be run at lower gain. Eugene
    thought that perhaps the amplifiers could be put into the PMT base.
    Fernando will be consulted about possible designs.

Contract Status

    Mark showed a draft [39]Advanced Procurement Plan (APP). This gives a
    schedule for completion of a construction contract for the TOF between
    FSU and JLab. He hopes to get it signed next week.

Action Items

      * Consult with JLab electronics experts on TDC problems. -> Sasha O.
      * Get started with light guide simulation. -> Elton, Beni
      * Link to Sascha S.'s rate note from Beni's rate wiki page. -> Beni
      * Ask Fernando about amplifiers for inner counters. -> ?
      * Comprehensive report on geometry options at a future meeting. ->
        Paul
      * Get APP signed. -> Mark

Retrieved from 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_TOF_Meeting%2C_March_18%2C_2011

References

   31. 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_TOF_Meeting%2C_March_4%2C_2011#Minutes
   32. https://mailman.jlab.org/pipermail/halld-pid/2011-March/000123.html
   34. http://www.jlab.org/Hall-D/software/wiki/index.php/Light_Guide_Design
   36. 
http://www.jlab.org/Hall-D/software/wiki/index.php/Detector_Rates_and_Lifetime
   37. 
http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1471
   39. 
http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1713