JEF meeting, March 22, 2024
From GlueXWiki
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 short cables: received, checked, labeled (last week)
- - HV long cable, 18 ready (out of 36)
- - HV distribution boards: in preparation
- - LV cables: 100 cables received, 640 cables in total
- - LV distribution boards [2]. Have to populate with connectors, and design a box around the PCB
- Ongoing projects -- Sasha / Vlad / Hakob / Laveen
- Testing of PMT dividers -- Sasha / Vlad / George
- - Testing procedure [6]
- - About 1420 dividers have been fabricated (Chris, Armen, Mindy)
- - Started removing power regulators on the newly fabricated dividers
- - George has recently tested 142 dividers (1063 have been tested in total) [7].
- - Adding ECAL (and updating FCAL) translation table in the TT.DB (needed for EPICS scalers)
- Installation of the FCAL2 detector & integration to GlueX -- Sasha / Vlad / Hakob / Laveen
- Preparing safety documents. The following ePASes have been submitted and approved -- Sasha and Vlad
- Installation of the ECAL LMS
- Installation of cables and dividers,
- Beam tests with the PS test setup
- Preparing ECAL cables (EEL126)
- Fabrication of calorimeter prototypes (EEL126)
- Testing ECAL dividers (EEL118) (approved in January)
- Installation of the LMS
- 1132 fibers have been installed [8]
- Cable and divider installation [9][10][11]
- Power installation on the platform has been completed [12]
- Detector installation page
- Other hardware projects
- --prototype of the ECAL veto counter
- --study shower profile using PS (also transition region between lead tungstate and LG modules (?) )
- Preparing safety documents. The following ePASes have been submitted and approved -- Sasha and Vlad
- Analysis/Simulation
- Generated bggen eta->pi0gg events with JEF geometry for background studies [16] -- Stjepan
Minutes
Attendees: Bill, Liping, Stjepan, Vlad, Sasha, Axel, Laveen, Olga, Igal, Jane, S.T.
- Beam test in Hall-D events on 3/15/24, radiation survey of beam line in FCAL showed no activation problem
- Cabling continued in EEL
- 100 more LV cables arrived, now have 640
- Laveen worked on bundling and labeling cables
- PMT divider fabrication continues, now have 1420
- George from detector support group continues testing them, now have 1063 tested dividers
- Some dividers (~5) needed to be repaired
- Some dividers produced lower amplitied (~20% level, maybe natural spread?)
- LMS installation was on hold during beam test, but have installed 1132 fibers as of meeting
- Will resume in April
- Discussed asking for money to build TOF veto counter for inner region not covered by existing TOF scintillators
- Narrow scintillator bars with wavelength shifting fibers + SiPM readout ?
- Use discriminators + TDCs instead of flashADCs to cut down cost of electronics
- Discussed idea to measure shower profile in transition region between lead tunstate and lead glass blocks
- Pair spectrometer setup in hall
- Have 5x5 ECAL-style modules + many FCAL lead glass blocks
- Need to consider how to power Cockroft-Walton bases for lead glass modules
- Plan to build 5x5 TAC using COMCAL-style housing + electronics
- Plan to refurbish old fiber-based profiler?
- Summer students: expect 1 from GW, 2 from UNCW
- Stjepan gave an update on studies of backgrounds in the π0γγ channel using bggen
- Used default analysis library/DReactionFilter cuts but added cut on χ^2/ndf from kinematic fit
- Igal suggested not to use default cuts but develop own, studying one-by-one with figure-of-merit