[Halld-pid] Minutes, GlueX Start Counter Meeting, November 3, 2011

[Mark M. Ito]

People,

Find the minutes at 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_3,_2011 
and as text below.

   -- Mark
   _____



GlueX Start Counter Meeting, November 3, 2011

Minutes

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

MOU

    The MOU has been signed by all parties at FIU and at JLab and is thus
    official! The FIU copy on the way back to Werner.

Plastic Craft Pieces

    The scintillator samples were sent back to Plastic Craft for
    re-polishing. No word yet from them on progress.

Mechanical Design

    Eric showed several views of possible positions for the 4x4 SiPM arrays
    with respect to the start counter. See ???view 1, view 2, view 3, view
    4, and view 5. This staggered arrangement has the disadvantage that the
    light guides come in two lengths.

    We also discussed other arrangements
      * two counters into one 4x4 array. This is the arrangement that
        Fernando Barbosa suggested as a possiblity. Each counter would be
        directed into a 2x4 sub-array of the 4x4 array being used by the
        BCAL. Each sub-array would be electrically independent, i. e., have
        a different summing circuit than that for the BCAL SiPM's. Fernando
        thought design of the accompanying pre-amp would not be difficult.
        No need to stagger the SiPM's in this case.
      * array that matches the start counter. Werner and Elton
        (independently) mentioned having an array that matches the area of
        the counters better, say 1x5 or 1x4. This would simplify the shape
        of the light guides and would fit inside the CDC without
        staggering.

    We need to research what arrangements are available from Hamamatsu. No
    one at the meeting had a definite idea about what they offer. We were
    also not able to assess how hard it would be to build electronics for
    SiPM's with alternate array configurations.

Simulation Status

    Puneet has surveyed and understood the processes we have in sim-recon
    now for hit generation (hdgeant), smearing (mcsmear), and
    reconstruction (dana). See [30]his slides for details and plots
    obtained from events generated with the particle gun.

Retrieved from 
https://halldweb1.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_3,_2011

References

   30. 
https://halldweb1.jlab.org/talks/2011-4Q/start_counter/khetarpal_sc_hdgeant.pdf