[Halld-pid] Start Counter Meeting Minutes, March 21, 2013

[Mark M. Ito]

Find the minutes below and at

https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_March_21,_2013#Minutes
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GlueX Start Counter Meeting, March 21, 2013
Minutes

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

Review minutes from previous meeting

    We went over the [19]minutes from the March 7th meeting.

    Eric reports that he re-did the gain measurement and indeed the ×5
    amplifier was there for the previous measurement. He has sent Fernando
    detailed information on the new measurement. Essentially the old
    results need to be scaled by a factor of 5.

Counter Construction

    Eric heard from Chuck Hurlbut of Eljen. They have reported that their
    first attempt at bending scintillators for us did not work. The bars
    did not hold their intended shape; on cooling they relaxed back
    somewhat toward their original flat shape. They are exploring
    modifications to their procedures including make a new bending fixture
    and trying different temperatures. Eric will check this week with them
    on progress.

    We should talk to Youri about the procedure that he used. FIU also had
    success with their bending procedure in the past. They heated the
    entire bar with weights used to hold the shape.

    Eric is working on the desing of the asssembly jig. He has an initial
    concept that he will discuss with Werner.

Light pulsing system or not?

    We discussed the need for a light pulsing system. We reached a
    consensus that there would likely not be much advantage to having one
    that could not be satisfied with cosmics or simply looking at noise
    from the SiPMs. These will tell you if the counters are alive. The
    start counter is not an energy measuring device so gain calibration is
    not a huge issues. Even if it were it would require a considerable
    effort to implement a system that would help with calibration.

    We reached a consensus that a light pulser system does not make sense.
    We will proceed without one in our plans.

Installation Document

    We talked about producing an installation document for planning when
    the start counter arrives in the Hall.

    On a related issue, we discussed the commissioning target and how it
    interfaces with the start counter. Chuck will ask Tim about how far
    along plans for that target are.

Contract

    Werner discovered that there was a person in the Dean's office at FIU
    that was sitting on the proposal. It seems to be moving now. He found
    that having a MOU to refer to has helped expedite the process. He
    assigned a nominal start date and end date for the project: April 1,
    2013 to March 31, 2014.

    [Added in press: Werner reports that the proposal now has an official
    project number and has started moving through the system.]

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References

   19. 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_March_7,_2013#Minutes

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