[Halld-pid] Start Counter Meeting Minutes, May 17, 2012

[Mark M. Ito]

Folks,

I realized yesterday that I never wrote up the notes from the meeting 
two weeks ago. Here they are, below and at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_May_17,_2012#Minutes 
.

   -- Mark
_____

GlueX Start Counter Meeting, May 17, 2012
Minutes

    Present:
      * FIU: Werner Boeglin, Puneet Khetarpal
      * JLab: Fernando Barbosa, Chuck Hutton, Mark Ito (chair), Yi Qiang,
        Tim Whitlatch, Beni Zihlmann

Simluation

    Puneet is going to start background rates studies with the new updated
    (30 paddle) geometry.

Mechanical Design

    Chuck showed the latest progress on the design. See [22]his slides for
    various views of the start counter focusing on the read-out area.
    Realistic drawings of the SiPM read-out boards are now included. Some
    highlights of the discussion:
      * A thermal mat could be used if needed to help cool the boards.
        Currently it is not in the plan.
      * There is spacer shown between the read-out boards for light
        tightening the counter volume.
      * Bolt holes holding the SiPM boards (ST1) to the support tube will
        serve as positioners.
      * A positioning template will be used when scintillators are attached
        to the foam to guarantee good alighnment with the SiPM's.
      * There will be air gap between the scintillator and the SiPMs.
      * There is currently a problem with interference of cable connector
        with support tube. A compromise with the target design will have to
        be struck.

SiPM Read-Out Boards

    Fernando reported that the plan is to send out the design tomorrow. It
    should be in fabrication by next week.

Prototype News

    Two scintillator samples came in from McNeal. One was badly crazed, but
    the other does not look so bad. Timing tests are next (for the good
    one).

TDR

    Werner continues to working on the TDR

    Retrieved from
    
"https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_May_17,_2012"

References

   22. https://halldweb1.jlab.org/talks/2012-2Q/sc_5_17_12.pptx

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