[Halld-pid] Minutes of the July 23 GlueX PID Meeting

[Mark M. Ito]

Find the minutes of the July 23 GlueX PID Meeting on the web at 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_PID_Meeting%2C_July_23%2C_2010 
and reproduced below.

GlueX PID Meeting, July 23, 2010

Minutes

      * FSU: Paul Eugenio, Sasha Ostrovidov
      * JLab: Eugene Chudakov, Hovanes Egiyan, Mark Ito (chair), Yi Qiang,
        Sascha Somov, Simon Taylor, Elliott Wolin, Beni Zihlmann


Review of minutes from the last meeting

    We went over [21]the minutes from the July 9th meeting:
      * PMT purchase: The eight phototubes purchased for the TOF prototype
        have not arrived at FSU.
      * LED pulsing system: Paul reminded us that although we have been
        discussing a calibration system for the TOF in the Hall, the LED
        system they have put together at FSU is aimed solely at
        understanding the prototype.
      * Trip to Columbia?: Mark raised the idea, originally suggested by
        Elton Smith, that some of us visit Ralf Gothe at the University of
        South Carolina to see his TOF set-up and discuss issues with him.
        USC is building the forward TOF for CLAS12. Elton was there
        recently and saw the set-up. We agreed that this was a good idea.
        Paul thought that a good time would be after the semester starts
        up.
      * USC items: Paul has been taking to Ralf from time to time.
           + They are using the same multi-paddle readout scheme that FSU
             will try.
           + They are using CAEN discriminators with a 25 ps least count,
             finer that what we are planning to use.
           + They are using much thicker scintillator than we are.


Time-of-flight prototype progress

    Sasha O. showed [23]a series of plots (similar to those shown last time
    but with other materials included) that show the effect of various
    wrapping material on light output from a prototype counter. The
    improvement with ESR over an unwrapped counter looks very good.

    Paul made some comments on ESR.
      * It comes with adhesive backing, with or without UV inhibitor
      * Longevity: others have not reported problems, even in outdoor use
        (solar energy applications)
      * It is non-metallic
      * Paul and Beni both wondered if IU might be interested for the FCAL.
      * It does have a mirror-like surface (not a difuse reflector).

    Paul has a sample, enough for one paddle, maybe two if not cut up. He
    will look into purchasing a roll. It should run about 1.2-1.5 k$.

    Paul also noted that they have been holding off on the new data
    acquisition configuration until these studies are done. Now they plan
    to go back to it, merging TDC's and ADC's in triggered events.

FSU MOU

    Paul sent a draft just before the meeting. He made some remarks:
      * This might be an opportunity to negotiate additional lab space.
        Production will require quasi-permanent space (stations) for
        various production steps.
      * Section 5.1 does not have any discussion of the calibration system.
      * He has added Elton's latest set of comments and corrections.


Action Item Review

    We went over [26]them. We still need a meeting with Fernando on the
    signal splitting scheme for the TOF.
      __________________________________________________________________

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"http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_PID_Meeting%2C_July_23%2C_2010"

References

   21. 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_PID_Meeting%2C_July_9%2C_2010#Minutes
   23. https://halldweb1.jlab.org/talks/2010-07/Sasha_July_23/
   26. 
http://www.jlab.org/Hall-D/software/wiki/index.php/Time-of-Flight/Start-Counter_Action_Items