PMT & Divider
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PMTs
- Hamamatsu R4125 PMT:
- 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/.
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]
- - New bases installed in the Hall
- [https://halldweb.jlab.org/detectors/fcal2/dividers/vlad_modify/HV1000V_900uA.docx Latest design of the divider (April 2021, 900 uA at 1 kV)
Documents