Difference between revisions of "JEF meeting, March 25, 2022"

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* Preparation for mass production of FCAL2 modules -- Sasha
 
* Preparation for mass production of FCAL2 modules -- Sasha
 
** PMT selection
 
** PMT selection
*** Olga checked PMT diameter of 360 newly received PMTs. Many PMTs from the last shipment (210 pcs) were tight (about 40%)
+
*** Olga checked PMT diameter of [https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/3_24_22/pmt_recently_checked.jpg  360 newly received PMTs]. Many PMTs from the last shipment (210 pcs) are [https://halldweb.jlab.org/detectors/fcal2/pmt/exchanged/pmt_diameter_check.jpg tight] (about 40%)
*** These PMTs were exchanged with NPS  
+
*** These PMTs were [https://halldweb.jlab.org/wiki-private/index.php/PMT_for_FCAL_insert#Delivered_PMTs exchanged] with NPS. 40 more PMTs were selected with Vlad and are ready for exchange when purchase spares.
 +
*** Total number of PMTs: ordered and received: 1510, 140 installed on CCAL.
 +
**** Need to order about 100 (?) spare modules.
 +
**** These PMTs are also used in different test setups
 +
** Production of Silicon cookies
 +
*** Received three fixtures to prepare silicon cookies [https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/3_24_22/silicon_cookie_fixture.jpg (42 dishes in each fixture)]; Olga will take two fixtures to the GWU.
 +
*** Olga [https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/3_24_22/production_of_sc.jpg produced three sets of silicon cookies] during her visit to Jlab. She will take equipment to the GWU today.
 +
*** Contract with the GWU is under preparation.
 +
** DSG group:  continue preshaping ESR reflectors (18 a day), and wrapping crystals (about 6 a day)
 +
** Chris A. is brazing brass straps, Bobby is honing PMT housings.
 +
** Igal is cutting Tedlar and ESR foils
 
* Module fabrication  -- Sasha
 
* Module fabrication  -- Sasha
 
**[https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/module_fabrication.pdf  Modules fabricated by Arshak and Sasha] [https://docs.google.com/document/d/1upI9M_RNR4qipzwg-SmxmzkqoCDU294x7Y3jT5M6DVY/edit (list on Google Drive)] (grand total 209)
 
**[https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/module_fabrication.pdf  Modules fabricated by Arshak and Sasha] [https://docs.google.com/document/d/1upI9M_RNR4qipzwg-SmxmzkqoCDU294x7Y3jT5M6DVY/edit (list on Google Drive)] (grand total 209)
** [https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/3_24_22/modules_in_tedf_3__22.jpg  Fabricated modules in TEDF ]
+
** [https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/3_24_22/modules_in_tedf_3_24_22.jpg  Fabricated modules in TEDF ]
 
** [https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/fcal_fabrication.pdf  Status of fabrication ]
 
** [https://halldweb.jlab.org/detectors/fcal2/module_fabrication/status/fcal_fabrication.pdf  Status of fabrication ]
* Light Monitoring System -- Arshak
+
* Light Monitoring System [[March 25 LMS update]] -- Arshak
* COMCAL tests, TAC running, etc.
+
* COMCAL tests, TAC running, etc. -- Sasha
 +
** Discussion at the CPP engineering meeting regarding using assembled modules (an array of 3x3) as a TAC) during the CPP run
 
* Data analysis
 
* Data analysis
 
* Simulations
 
* Simulations
 +
 +
=Minutes=
 +
Attendees: Bill, Zisis, Arshak, Tegan, Igal, Jon, Liping, Olga, Phil, Jane, Sasha, S.T.
 +
*Arshak gave an update on the LMS
 +
** Illuminated a small plexiglas plate with light from 2 blue LEDs from 10 fibers injected on one side and looked at the light uniformity across the plate
 +
** Saw noticeable gradient in the measured light the further the probe was from the fibers, as expected, but relatively uniform in a column near the center, and an increase in the column furthest from the source due to reflection
 +
** Plan to illuminate the plate with additional fibers on the opposite side of the current set of fibers
 +
** Plan to build a larger scale prototype
 +
* Sasha reported plan to purchase 100 PMT spares -- plan to ask Hamamatsu to pre-select for diameter given the relatively large fraction of tubes from a recent batch that were too wide
 +
** Trades with NPS to get their smaller diameter PMTs
 +
** Also plan to order 200 new sockets
 +
* Fabrication of modules continues -- now up to 209
 +
* Plan to build 28(?) new PMT dividers by summer, all dividers for FCAL-II ordered by fall?
 +
* We had some discussion about the state of the single-block TAC and the possibility of building a 3x3 array using lead tungstate crystals
 +
** Test setup downstream of FCAL?
 +
* Lab has switched to MedCon-3:  Sasha will check what this means for students in the summer (Phil potentially has students he could send but needs to know soon)
 +
* Sasha to meet with Tim regarding cables/patch panels for FCAL-II

Latest revision as of 08:21, 28 March 2022

Meeting time and location

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

Agenda

  • Preparation for mass production of FCAL2 modules -- Sasha
    • PMT selection
      • Olga checked PMT diameter of 360 newly received PMTs. Many PMTs from the last shipment (210 pcs) are tight (about 40%)
      • These PMTs were exchanged with NPS. 40 more PMTs were selected with Vlad and are ready for exchange when purchase spares.
      • Total number of PMTs: ordered and received: 1510, 140 installed on CCAL.
        • Need to order about 100 (?) spare modules.
        • These PMTs are also used in different test setups
    • Production of Silicon cookies
    • DSG group: continue preshaping ESR reflectors (18 a day), and wrapping crystals (about 6 a day)
    • Chris A. is brazing brass straps, Bobby is honing PMT housings.
    • Igal is cutting Tedlar and ESR foils
  • Module fabrication -- Sasha
  • Light Monitoring System March 25 LMS update -- Arshak
  • COMCAL tests, TAC running, etc. -- Sasha
    • Discussion at the CPP engineering meeting regarding using assembled modules (an array of 3x3) as a TAC) during the CPP run
  • Data analysis
  • Simulations

Minutes

Attendees: Bill, Zisis, Arshak, Tegan, Igal, Jon, Liping, Olga, Phil, Jane, Sasha, S.T.

  • Arshak gave an update on the LMS
    • Illuminated a small plexiglas plate with light from 2 blue LEDs from 10 fibers injected on one side and looked at the light uniformity across the plate
    • Saw noticeable gradient in the measured light the further the probe was from the fibers, as expected, but relatively uniform in a column near the center, and an increase in the column furthest from the source due to reflection
    • Plan to illuminate the plate with additional fibers on the opposite side of the current set of fibers
    • Plan to build a larger scale prototype
  • Sasha reported plan to purchase 100 PMT spares -- plan to ask Hamamatsu to pre-select for diameter given the relatively large fraction of tubes from a recent batch that were too wide
    • Trades with NPS to get their smaller diameter PMTs
    • Also plan to order 200 new sockets
  • Fabrication of modules continues -- now up to 209
  • Plan to build 28(?) new PMT dividers by summer, all dividers for FCAL-II ordered by fall?
  • We had some discussion about the state of the single-block TAC and the possibility of building a 3x3 array using lead tungstate crystals
    • Test setup downstream of FCAL?
  • Lab has switched to MedCon-3: Sasha will check what this means for students in the summer (Phil potentially has students he could send but needs to know soon)
  • Sasha to meet with Tim regarding cables/patch panels for FCAL-II