JEF meeting, February 7, 2025

Connection

Meeting time and location:

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

Agenda

Preparation of parts for ECAL -- Sasha

-New LMS light source is ready [1]. Will be installed and checked during next week. Parts for holding reference PMTs are ready.

-Installation of the FCAL2 detector & integration to GlueX -- Sasha, All

• Implementing ECAL into the GlueX DAQ [2]

- Six VTPs have been installed, firmware loaded

- Testing GTP trigger using individual ECAL VXS crates [3]

• Commissioning the entire detector using the LMS (signal waveforms)

- Signal waveforms after resolving issues with the ECAL modules [4]

- Long-term stability check [5]

List of cosmic runs

• ECAL HV interlock check [6]
• HV module failed during cosmic run [7]
• Tuning HV settings [8]
• Material in front of the ECAL, TOF absorber [9][10]
• Temperature scan in the ECAL divider region [11][12][13]

Fans replaced in the central region [14]

Lower detector high voltages [15]

Temperature of the NPS detector[16]

2 temperature sensors in the divider region connected, fan included into the detector interlock [17] -- Josh, Bobby

Temporary temperature sensors installed in the ECAL region [18]

• Preparing for the run -- Sasha

Page for shift Takers

ECAL in the Experimental Safety Assessment Document (ESAD)

EPAS for Maintenance of the Hall D ECAL (Jlab-PTW-5236)

• Safety briefings - Vlad, Sasha
• FCAL2 Engineering Meetings
• Detector installation page

Restoring PS test setup [19]

Working on the plan for testing calorimeter prototype

ECAL commissioning -- Sasha, All Calibrations

- Update on calibration with cosmic ray -- Zhikun

Abstract for the SPIE conference

Preparations for readiness review

• FCAL2 software -- Simon

Minutes

Attendees: Jane, Zhikun, Liping, Igal, Sasha, Axel, Mac, Drew, Bill, Zisis, Olga, Vlad, S.T.

• During long cosmic run found voltages off due to tripping HV interlock
  • Over-temperature due to slight shift in position of fans
  • Ran with lower ADC threshold, possible due to recalibration of baseline
• Zhikun showed the results of analyzing recent cosmic runs
  • Updated HV settings (3rd iteration) to bring peak positions closer to 8 counts above baseline
    • Considering setting calibration peak at 10-12 counts
    • HV limit = 1.05 kV, could in principle raise to 1.1-1.2 kV
• New firmware for global trigger needed to be installed on replacement GTP
• Storing archive of signal waveforms from LMS to help tracking health of detector over time
  • Run with current LMS, then with upgraded LED light source
• We discussed preparations for the readiness review
  • Impact of temperature gradient on non-linearity of response, pulse shape, light response, ...
    • How long to wait for stability after access and restoration of HV?
  • Simon showed some draft slides on software status