Latest revision as of 14:52, 13 January 2025

Connection

Meeting time and location:

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

Agenda

Preparation of parts for ECAL -- Sasha

-New PCB and parts for the LMS light source arrived to the lab. The LMS board will be assembled and tested during next week.

-Consider to install two more temperature sensors (will try to fix the old ones first), a few sensors have been ordered

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

• Implementing ECAL into the GlueX DAQ [1]

- Initial version of the VTP firmware ready. Started testing using a setup with one VTP during the holiday break (some progress has been made)

- VTPs installed on all ECAL VXS crates [2]

- Use new version of DAQ, VTP included as a DAQ component. Will be updated on the entire detector after the ECAL commissioning

• All HV distribution boards have been installed [3] [4] [5] [6] [7]

-Replace one HV module (problems with the interlock) [8]

• Update signal translation table [9]
• Update mapping of the ECAL high voltages and spare HV cables [10]
• Implement ECAL HV interlock based on the newly installed temperature sensors in the divider region
• Toook cosmic data with the entire detector powered [11][12]
• Temperature of the ECAL modules [13][14] [15][16]

Previous temperature scan in the ECAL divider region [17][18][19] [20][21]

• Safety documents and preparing for the run

Page for shift Takers

ECAL in the Experimental Safety Assessment Document (ESAD)

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

ECAL commissioning -- Sasha, All

Calibrations

• Gain calibration [22]
• Low-level timing
• Timing with respect to other detectors

Analysis/Simulation

Minutes

Attendees: Xiaolin, Bill, Axel, Sasha, Zhikun, Igal, Zisis, Tim W., Drew, Liping, Olga, Phil, S.T.

• Upgrade of LMS light source to use 25 LEDs underway
  • PCB arrived, needs to be populated
    • Assemble and test week of January 13
  • Driver has been updated
• New temperature sensors have been ordered
• All VTPs (replacing CTPs for 7 crates) have been installed
  • New VTP firmware now implemented, tested energy summation for 1 VTP
  • Integration into full DAQ system underway
• Cables for reference PMTs for LMS installed
• All HV distribution boards installed, cabling complete
  • Several issues found (holes too small, connectors missing locking clip, etc.), these have been addressed
  • One HV channel could not hold desired voltage, use spare connector
  • One HV module had interlock problem, now fixed
  • Signal translation table updated
  • Whole detector checked using scaler rates produced by LMS
  • Ran cosmic ray data over winter break
  • Ran HV scan
• Temperature sensors installed in upper corners of insert
• 2 additional fans have been installed
  • Fans in center region are weaker than the new ones
  • Would like to add fans to interlock system
• Temperature profile for lead glass region shows hot spots
• Temperature on face of lead tungstate modules rises to 30C after HV(=1.04 kV on all) on for a while
  • Is heat being propagated through the pipe? Sasha blocked the aperture and saw no difference
  • Is head being propagated through the pipe material? Working on concept for cooling the pipe down
  • Is heat begin propagated through the lead tungstate modules themselves? Seems likely.
    • Gradient in z through the module is an issue due to the dependence of light output on temperature, likely to cause distortion of shower profile
  • Relaxation time and time to stabilize after toggling HV is on the scale of hours
  • Cooling power not sufficient: increase fan power? Lower chiller temperature?
• Zhikun looked at recent cosmic data, saw some nice tracks
  • Fitted amplitude distributions using Landau distribution convoluted with Gaussian, use to estimate new voltage settings