JEF meeting, February 16, 2024

Meeting time and location:

• 9:30 am EST (JLab time) remote only
• Connection information

Agenda

• Preparation of parts for ECAL -- Sasha
  • - signal cables - done
  • - signal patch panel [1] - done
  • - HV cables: received 165 cables 1445 in total
  • - HV distribution boards: in preparation
  • - LV cables: 100 cables received, 250 cables in total
  • - LV distribution boards. Received 4 boards, performed initial cehck, need to solder connectors [2]
  • - Optical fibers and parts for the trigger/DAQ have been ordered
• Ongoing projects -- Sasha, all
  • - Testing and labeling cables, 100 short LV cables tested and labeled during this week.
  • - Prepare modules for the TAC and prototypes (using crystals with some imperfections)
    • 26 modules for TAC [3] and 35 modules [4] for the beam tests are ready
  • - Radiation tests of the PMT active base [5]
    • Finished tests, working on the tech note
  • - Inventory database and GUI for installed electronics
  • - Summer Students (2023)
• Testing of PMT dividers -- Sasha / Vlad / George
  • - Testing procedure [6]
  • - ePASS submitted and approved
  • - George from the DSG continued testing dividers
  • - Have tested 637 + 134 = 771 dividers (about 100 available for testing) [7].
  • - Spare PMTs, have about 20, likely need more for the future (order 30 more )?
• Installation of the FCAL2 detector & integration to GlueX -- Sasha / Vlad
  • Detector installation [8][9][10]
  • Installation of the LMS
    • 175 fibers installed during this week (488 in total) [11] [12]
  • Cable and divider installation [13][14][15]
  • Still no power on the ECAL platform (expect delay with the development of the trigger/DAQ)
  • Detector installation page
• Analysis/Simulation
  • Rough draft of Feb. collaboration talk -- Simon
  • updates -- ig

Minutes

Attendees: Sasha, Bill, Igal, Liping, Vlad, Laveen, Zisis, Stjepan, Olga, Susan, Jane, Jon, S.T.

• Chris S. fabricating dividers, George J. from detector support group testing them (134 last week)
  • ~100 to be tested
  • Fabrication quality improved (only one "bad", already fixed)
• Expect to use 3x amplier ~10x10 array around beam pipe due to high rate
  • Also plan to run at lower HV than others
• Cables/dividers installed up to third row from bottom of insert
  • Desigining tool for replacing dividers: laparoscopy grasping forceps
  • Testing dividers in place with HV (make light tight first)
• LMS installation continues
  • Needed to order face shield due to UV light backsplash
  • Fibers ordered into bundles, clamped and clamps attached to plexiglas
  • Position of integrating sphere to be fixed
  • Some bad fibers identified, moved to side
• S.T. showed look at simulation of a small inner TOF counter covering the hole not covered by the regular TOF
  • Rates in 1 mm wide strips look manageable
  • Need to check impact of new veto on golden channel
• Beam test in March: only GEMTRD studies, nothing else turned on
  • Hopefully no significant activation in inner region of insert
• Igal studying golden channel using low level objects (not DReactionFilter)
  • Chi^2 test to select best candidate per event
  • BCAL veto needed to get rid of ω background
  • TOF veto not as effective as originally thought after TOF bug in simulation found and fixed
  • Working with Daniel L. on machine learning algorithm