Difference between revisions of "JEF meeting, December 9, 2022"

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***https://userweb.jlab.org/~aasatury/Fcal_LMS/beam_test/4_5_6.gif
 
***https://userweb.jlab.org/~aasatury/Fcal_LMS/beam_test/4_5_6.gif
 
* '''Simulations/Analysis'''
 
* '''Simulations/Analysis'''
 +
 +
=Minutes=
 +
Attendees: Sasha, Arshak, Phil, Igal, Malte, Jane, Jon, Liping, Azizah, Bill, Zisis, Axel
 +
* Arshak presented progress on measuring cross talk due to LMS plexiglas plate using 3x3 setup in PS test stand in hall
 +
** PbW04 module in center, dummies with just ESR wrapping on left and right, long light guides on top and bottom
 +
** Front face blocked on on side of center, open on other side
 +
** Light guides still present for dummies
 +
** Secondary lepton beam hits ~center of crystal, in coincidence with PS tile
 +
*** Could be centered a little better
 +
** Almost the same amplitudes of signals on left and right tubes = almost no cross talk
 +
*** Small asymmetry is seen -- suggest swapping which face is closed
 +
*** Could do test without light guides on left and right
 +
*** Look at energy distribution of possible cross talk?
 +
** Redo test with a true 3x3 prototype of crystals?
 +
* COMCAL will be disassembled next year -- leave a 5x5 array for tests with new PMT dividers?
 +
* Still continuing to receive Crytur crystals, expect more by end of year, and expect new batch in May of next year
 +
* Wrapping of existing crystals continues -- 30 more to go
 +
* Mindy from detector support group soldering wires to PMT sockets
 +
* Inventory of parts needed for module fabrication looks good
 +
* Grand total fabricated modules = 1371, hope for 1400 by end of year
 +
* Bench tests for PMT dividers (two versions: bypassed amplifier and 3x amplifier) ongoing
 +
** Concern: NPS experience with higher gain amplifier (20x vs 3x) = large noise level, 200 MHz frequency -- do we need to be concerned?  Probably not due to smaller gain amplifier
 +
** Noise tests inside FCAL dark room
 +
*** With bypassed amplifier: FCAL HV off: low noise;  FCAL HV on: some noise spikes
 +
*** With 3x amplifer:  see CANBUS activity and higher amplitude noise level with FCAL HV off, increases with FCAL HV on
 +
**** Still looks like ~3 mV threshold should be possible
 +
*** Bring 3x3 crystal prototype into dark room?
 +
*** Use shielded cables for CANBUS?
 +
* Need to give green light to Fernando regarding PMT divider order soon
 +
* Patch panel design:  separation of HV and LV
 +
* List of summer students is growing:
 +
** 2 from Lamar, 2 from URegina, up to 4 from UNCW, 1 from GWU
 +
** Lab will support students at some level
 +
** Sasha anticipates needing 11 students for 3 months

Revision as of 10:44, 12 December 2022

Meeting time and location:

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

Agenda

Minutes

Attendees: Sasha, Arshak, Phil, Igal, Malte, Jane, Jon, Liping, Azizah, Bill, Zisis, Axel

  • Arshak presented progress on measuring cross talk due to LMS plexiglas plate using 3x3 setup in PS test stand in hall
    • PbW04 module in center, dummies with just ESR wrapping on left and right, long light guides on top and bottom
    • Front face blocked on on side of center, open on other side
    • Light guides still present for dummies
    • Secondary lepton beam hits ~center of crystal, in coincidence with PS tile
      • Could be centered a little better
    • Almost the same amplitudes of signals on left and right tubes = almost no cross talk
      • Small asymmetry is seen -- suggest swapping which face is closed
      • Could do test without light guides on left and right
      • Look at energy distribution of possible cross talk?
    • Redo test with a true 3x3 prototype of crystals?
  • COMCAL will be disassembled next year -- leave a 5x5 array for tests with new PMT dividers?
  • Still continuing to receive Crytur crystals, expect more by end of year, and expect new batch in May of next year
  • Wrapping of existing crystals continues -- 30 more to go
  • Mindy from detector support group soldering wires to PMT sockets
  • Inventory of parts needed for module fabrication looks good
  • Grand total fabricated modules = 1371, hope for 1400 by end of year
  • Bench tests for PMT dividers (two versions: bypassed amplifier and 3x amplifier) ongoing
    • Concern: NPS experience with higher gain amplifier (20x vs 3x) = large noise level, 200 MHz frequency -- do we need to be concerned? Probably not due to smaller gain amplifier
    • Noise tests inside FCAL dark room
      • With bypassed amplifier: FCAL HV off: low noise; FCAL HV on: some noise spikes
      • With 3x amplifer: see CANBUS activity and higher amplitude noise level with FCAL HV off, increases with FCAL HV on
        • Still looks like ~3 mV threshold should be possible
      • Bring 3x3 crystal prototype into dark room?
      • Use shielded cables for CANBUS?
  • Need to give green light to Fernando regarding PMT divider order soon
  • Patch panel design: separation of HV and LV
  • List of summer students is growing:
    • 2 from Lamar, 2 from URegina, up to 4 from UNCW, 1 from GWU
    • Lab will support students at some level
    • Sasha anticipates needing 11 students for 3 months
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