Difference between revisions of "JEF meeting, December 18, 2020"

From GlueXWiki
Jump to: navigation, search
(Minutes)
 
(9 intermediate revisions by 3 users not shown)
Line 22: Line 22:
 
=Agenda=
 
=Agenda=
 
* SICCAS crystals
 
* SICCAS crystals
*: -[https://halldweb.jlab.org/wiki/index.php/Module_Design Preparation for module fabrication]
+
*: -[https://halldweb.jlab.org/detectors/fcal2/crystals/QA_check/second_batch_10_2020/transmission Transmission measurement, second batch]
*: -[https://halldweb.jlab.org/wiki/index.php/Module_Design Preparation for module fabrication]
+
*: - [https://halldweb.jlab.org/detectors/fcal2/module_fabrication/prepare_for_construction/first_modules.jpg  1st fabricated modules]
 +
*: - [https://halldweb.jlab.org/wiki/index.php/Module_Design Preparation for module fabrication]
 
* COMCAL tests, TAC running, etc.
 
* COMCAL tests, TAC running, etc.
 
* Data analysis
 
* Data analysis
 
* Simulations
 
* Simulations
 
* Contributions to next year's April APS/GHP meetings?
 
* Contributions to next year's April APS/GHP meetings?
 +
* Contributions to [https://indico.jlab.org/event/413/ 1st workshop on new light physics and photon-beam experiments]
 +
 +
=Minutes=
 +
Attendees: Jane,Zisis,Jared,Liping,Phil,Sasha,Tim B.,Igal,Bill B.
 +
* Sasha continued the light transmittance measurements: [https://halldweb.jlab.org/detectors/fcal2/crystals/QA_check/second_batch_10_2020/transmission/Plot%206.png 5 good + 5 discolored]
 +
** Two crystals below spec at 360 nm but okay at higher wavelengths
 +
** Agree with SICCAS measurements -- no red flags
 +
** Will try UV curing in January
 +
** Meet with SICCAS representative in January to provide feedback?
 +
* Completed construction of 4 crystal modules, one with PMT
 +
** Rusty-looking module was constructed 6 months ago - should we add a layer of paint?
 +
** Have enough components for 12 modules
 +
** Will be getting assistance from Tim W.'s group for mass production
 +
** Josh working on ESR preshaping -- can do 2 at time in our oven, but Hall C has a larger oven
 +
** Need to check cookie size (we make them ourselves)
 +
** Open question is temperature control for brazing and amount of flux
 +
*** Work on procedure in coming weeks
 +
* 25% tariff for crystals still an issue, could impact order of next batch
 +
** May need smaller insert size
 +
* PMT base design converging, tests to measure linearity of amplifier
 +
** Maybe we don't need the 3x amplifier?
 +
*Loan agreement with U. Regina is moving forward

Latest revision as of 09:15, 21 December 2020

Meeting time and location= 8:30 am EST (JLab time) Bluejeans only


Connection instructions

We are using BlueJeans Video/Audio conferencing. Our meeting ID number is 992533564. Click "Expand" for more details.

  • Make sure you have created a BlueJeans account via your JLab CUE account using this link:
  • If connecting via Web Browser: click this link (no passcode is needed):
  • If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"
  • If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above

Agenda

Minutes

Attendees: Jane,Zisis,Jared,Liping,Phil,Sasha,Tim B.,Igal,Bill B.

  • Sasha continued the light transmittance measurements: 5 good + 5 discolored
    • Two crystals below spec at 360 nm but okay at higher wavelengths
    • Agree with SICCAS measurements -- no red flags
    • Will try UV curing in January
    • Meet with SICCAS representative in January to provide feedback?
  • Completed construction of 4 crystal modules, one with PMT
    • Rusty-looking module was constructed 6 months ago - should we add a layer of paint?
    • Have enough components for 12 modules
    • Will be getting assistance from Tim W.'s group for mass production
    • Josh working on ESR preshaping -- can do 2 at time in our oven, but Hall C has a larger oven
    • Need to check cookie size (we make them ourselves)
    • Open question is temperature control for brazing and amount of flux
      • Work on procedure in coming weeks
  • 25% tariff for crystals still an issue, could impact order of next batch
    • May need smaller insert size
  • PMT base design converging, tests to measure linearity of amplifier
    • Maybe we don't need the 3x amplifier?
  • Loan agreement with U. Regina is moving forward