PMT & Divider

PMTs

• Hamamatsu R4125 PMT:

Specs

gain-HV

socket

Dynode location

• Magnetic shielding

• TOSCA calculation (by Sasha Glamazdin)

presentation

(ppt file location /u/group/halld/Subsystems/HFCal/talk/Hybrid_FCal_shield.pptx)

Directory with TOSCA results /u/group/halld/Subsystems/HFCal/.

• Magnetic field measurements

Prototype of the PMT housing (magnetic field shielding)

• Procurement of PMTs in 2019

• PMT testing for Compton Calorimeter (2018)

PMT Active Base

• New Active PMT Base for PbWO4 (Popov, H. Mkrtchyan, presentation at IEEE, Nov 2012)

• Linearity measurements with CCAL

• Test performance of electronics using a 3x3 PWO prototype

• Active base performance at high rate

Modified Active Bases (2020)

Three modified active bases were installed on the CCAL

• Test of modified active bases installed on CCAL (3 modules)

• Estimates of the PMT Anode Current of the CCAL (FCAL2) Modules