PMT & Divider

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PMTs

  • Hamamatsu R4125 PMT:
Specs
gain-HV
socket
Dynode location
Hamamatsu PMT manual
  • 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/.
Prototype of the PMT housing (magnetic field shielding)



PMT Active Base


Modified Active Bases (2020)

Three active bases were modified by V.Popov. They were installed and testes using the CCAL
(including resistor values for different amplifier gains)
  • New modifications: (1) modify resistors to limit divider current below 1 mA (2) Increase voltages on first dynodes
- New bases installed in the Hall
Divider current after installation [1]
- Corresponding voltages
- Resistor values[2]


Documents

PMT lifetime studies at FNAL