[Halld-pid] Start Counter Meeting Minutes, February 7, 2013

[Mark M. Ito]

Find the minutes below and at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_February_7,_2013#Minutes 
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GlueX Start Counter Meeting, February 7, 2013
Minutes

    Present:
      * FIU: Werner Boeglin, Puneet Khetarpal, Eric Pooser
      * JLab: Chuck Hutton, Mark Ito (chair), Beni Zihlmann

Counter Construction

    Eric is doing wrapping tests with the old McNeal bars. He will try lots
    of combinations:
     1. no wrapping
     2. Mylar
     3. Mylar and Tedlar
     4. aluminum
     5. aluminum and Tedlar
     6. Tedlar

    He would like to have all measurements done in time for the
    collaboration meeting.

    Five bars have been ordered from Eljen, all with the bend. McNeal has
    quoted a price of $225 per paddle to do the machining.

    The assembly jig design is complete. Eric showed several [19]pictures.
    The idea is to have two rings (orange) with each with 30 springs to
    hold counters that have been placed on the inner support cylinder. The
    start entire assembly can be rotated around the axis along a horizontal
    axis corresponding to the beam line. There are pneumatic plungers at
    the top position to hold a single counter while it is being positioned
    (the corresponding springs will be relaxed. This is a lot simpler than
    the scheme which was proposed previously. Chuck and Tim Whitlatch will
    review the idea.

    Chuck pointed out that his drawings do not account for any space
    between counters. Estimates for the thickness of any wrapping are less
    than reasonable mechanical tolerances in any case.

SiPM read-out status

    The gain measurements for Fernando Barbosa are complete. Eric will
    write up the results and send them to Fernando soon.

Monitoring system

    Werner points out that our planning for a light monitoring system has
    fallen by the wayside. We will start collecting ideas.

Contract

    We discussed where to put the readiness review into the milestones in
    the proposal. Near the beginning of construction seemed reasonable.

    Retrieved from
"[20]https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_February_7,_2013"

References

   19. https://halldweb1.jlab.org/talks/2013-1Q/Assembly_Jig/
   20. 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_February_7,_2013

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