Revision as of 11:27, 14 April 2025

Connection

Meeting time and location:

ECAL maintenance and performance during the run
- Issue with the FCAL HV module [1]
- Flash ADC scalers during first beam [2]
- Two modules fixed during the accelerator maintenance day [3]
  - ECAL scalers after maintenance day (production at 100 nA on 4.5x10^-4 Al radiator) [4]
- Commissioning of the ECAL trigger [5] [6]
- Issues with the readout crate during two first two production nights [7]
Calibrations
- First look at Compton scattering events in the ECAL [8]
- ECAL/FCAL energy and timing [9]
  - ECAL coverage with 2-arm Compton [10]
Monitoring
Restoring PS test setup [11]
- Assembling PS prototype [12]

Attendees: Liping, Bill, Sasha, Jane, Drew, Axel, S.T.

Working on setting optimum energy scaling w.r.t. the FADC range for the ECAL
- Need to set FADC channel for 9 GeV crystal energy so as to not go out of range due to energy fluctuations
Have new guesses for ECAL HV settings based on Compton analysis; these have not been set yet.
- Use to set global scale
- Maybe ramp up HV a little?
Had failure of one of HV modules for ECAL
5x5 PWO + 5x5 lead glass prototype assembled in COMCAL box, ready for installation in hall
- Using PMT dividers from Hall A for lead glass modules, need adapter for HV connector or replacement

@@ Line 16: / Line 16: @@
 * Calibrations
 ** First look at Compton scattering events in the ECAL [https://logbooks.jlab.org/entry/4352034]
+** ECAL/FCAL energy and timing [https://logbooks.jlab.org/entry/4352404]
 *** ECAL coverage with 2-arm Compton [https://userweb.jlab.org/~andrsmit/files/ECAL/04_11_2025/ecal_compton_coverage.pdf]
 * Monitoring
-** ECAL/FCAL energy and timing [https://logbooks.jlab.org/entry/4352404]
 * Restoring PS test setup [https://halldweb.jlab.org/detectors/fcal2/installation/meetings/08_09_2024/ps_setup.jpg]
 ** Assembling PS prototype [https://halldweb.jlab.org/wiki/index.php/PS_test_setup]