Difference between revisions of "JEF meeting, January 20, 2023"

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* '''Simulations/Analysis'''
 
* '''Simulations/Analysis'''
 
* '''Talk on JEF at GHP conference'''
 
* '''Talk on JEF at GHP conference'''
 +
 +
=Minutes=
 +
Attendees:  Axel, Bill, Sasha, Arshak, Olga, Liping, Susan, Igal, S.T.
 +
* We agreed that Bill would give a talk on JEF at the GHP meeting.  A draft of an abstract has been circulated.
 +
* Only 1 Crytur crystal remains to be fabricated into an FCAL-2 module
 +
* 48 crystals have been removed from the COMCAL and stripped of wrapping
 +
** Most of the caps for fiber insertion have been removed
 +
** These crystals are to be converted into FCAL-2 modules
 +
* Inner part of the COMCAL will not be used for FCAL-2 due to likely radiation damage
 +
* Grand total FCAL2-modules = 1410
 +
* Mindy from the detector support group will continue wrapping and soldering wires into sockets
 +
* Will install a 5x5 prototype of FCAL2 modules into COMCAL instrumented with new PMT dividers w/ active base
 +
** Chris S. has built 25 new dividers
 +
** Plan to install in hall for beam tests to perform rate measurements, use as TAC, study linearity
 +
* Summer students:  ~6 have registered, expect a student from Colin Gleason
 +
* Hoping to get ~25% time from Vlad B. during summer
 +
* RTV for making cookies has arrrived; Bill will take to Olga
 +
* Arshak has been checking light uniformity of 250 micron diameter fibers (alternate approach to LMS, to be compared to plexiglas plate approach)
 +
** Attached bundle to integrating sphere, look at individual fiber light output
 +
** First results do not look very uniform: ~30% variation, with one outlier even worse (see [https://userweb.jlab.org/~aasatury/Fcal_LMS/250mkm/250mkm_fiber.jpg])
 +
*** Suspect due to polishing of fiber end -- could be improved with different procedure?
 +
*** Consider using 500 micron diameter fibers instead?  1 mm fibers demonstrated to work, but are more difficult to bend and contribute more material in front of insert
 +
** Will probably need to have a bundle of fibers with enough spares, pick and choose to get the desired uniformity

Revision as of 15:53, 20 January 2023

eeting time and location:

  • 9:30 am EST (JLab time) remote only
  • Zoom meeting ID: 161 050 9142 Passcode: 004965

Agenda

Minutes

Attendees: Axel, Bill, Sasha, Arshak, Olga, Liping, Susan, Igal, S.T.

  • We agreed that Bill would give a talk on JEF at the GHP meeting. A draft of an abstract has been circulated.
  • Only 1 Crytur crystal remains to be fabricated into an FCAL-2 module
  • 48 crystals have been removed from the COMCAL and stripped of wrapping
    • Most of the caps for fiber insertion have been removed
    • These crystals are to be converted into FCAL-2 modules
  • Inner part of the COMCAL will not be used for FCAL-2 due to likely radiation damage
  • Grand total FCAL2-modules = 1410
  • Mindy from the detector support group will continue wrapping and soldering wires into sockets
  • Will install a 5x5 prototype of FCAL2 modules into COMCAL instrumented with new PMT dividers w/ active base
    • Chris S. has built 25 new dividers
    • Plan to install in hall for beam tests to perform rate measurements, use as TAC, study linearity
  • Summer students: ~6 have registered, expect a student from Colin Gleason
  • Hoping to get ~25% time from Vlad B. during summer
  • RTV for making cookies has arrrived; Bill will take to Olga
  • Arshak has been checking light uniformity of 250 micron diameter fibers (alternate approach to LMS, to be compared to plexiglas plate approach)
    • Attached bundle to integrating sphere, look at individual fiber light output
    • First results do not look very uniform: ~30% variation, with one outlier even worse (see [4])
      • Suspect due to polishing of fiber end -- could be improved with different procedure?
      • Consider using 500 micron diameter fibers instead? 1 mm fibers demonstrated to work, but are more difficult to bend and contribute more material in front of insert
    • Will probably need to have a bundle of fibers with enough spares, pick and choose to get the desired uniformity
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