JEF meeting, May 3, 2024
From GlueXWiki
Meeting time and location:
- 9:30 am EST (JLab time) remote only
- Connection information
- 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: waiting for about 160 cables (will need to test, label, and bundle)
- - LV distribution boards [2]. Have to populate with connectors, and design a box around the PCB
- - Chris S. is working on the prototype of the LED board. Currently 5 blue LEDs, consider to add red LEDs as well
- Ongoing projects
- Testing of PMT dividers -- Sasha / Vlad / George / Mindy
- Installation of the FCAL2 detector & integration to GlueX -- Sasha / Vlad / Hakob / Laveen
- Installation of the LMS has been completed [6]
- Installation and testing cables and dividers [7][8]
- All crates are connected to the network switch Ethernet switch [9]
- Preparing for testing installed dividers
- Detector installation page
- Preparation for beam tests with the PS
- measure shower beam profile
- shower reconstruction between PbWO4 and LG
- Other hardware projects
- --prototype of the ECAL veto counter
- --study shower profile using PS (also transition region between lead tungstate and LG modules (?) )
- FCAL2 poster for open house?
- JEF/ECAL/FCAL poster
- Analysis/Simulation
- eta to ggpi0's update -- ig
Minutes
Attendees: Igal, Liping, Olga, Laveen, Bill, Sasha, Vlad, Stjepan, Zisis, Jane, Jon, S.T.
- Laveen reported that 50 more LV cables have been labelled and tested, still need 110
- 6 layers of PMT dividers have been installed and tested
- Dark room made dark using tedlar and plates
- Bypassed amplifier
- Set 1kV HV (close to nominal voltage; expect ~920V when have amplifier installed)
- Issue with CAEN HV interlock needs to be resolved
- Use LMS with 7V on LEDs to provide light input, look at signals on oscilloscope
- Found a few problems: swapped signal cables; one HV cable not able to hold HV, needed to be swapped out
- Ethernet cables for 7 crates have been installed, connected all crates to switch
- 6 layers of PMT dividers have been installed and tested
- PMT dividers all fabricated and tested
- Plan to increase number with regulator removed
- Plan to install and test one layer of PMTs at a time; can do one layer every 1-2 days
- Need HV control to be implemented in CSS
- Chiller installation underway, need final plumbing, would like to be operational for full testing of insert (okay for now for short-duration testing)
- Igal gave an update on η→π0γγ
- Went over GAMS results
- Highest measured BR for η→π0γγ
- Saw η'→ωγ, ω→π+π-π0 but ω→π0γ not shown
- Strict cuts to isolate signal
- Went over A2 results
- Background due to 2π0
- Suppress η→3π0 background with shower effective radius cut
- η' possible good reference channel
- Discussed contributions to η→2γ peaking background (shower splitting + conversions (which we can suppress using TOF veto))
- Introduce PINN (physics-informed neutal network)
- Looked at spring 2017 data -- no obvious signal seen
- Went over GAMS results