Difference between revisions of "PMT & Divider"

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(PMT Active Base)
(PMT Active Base)
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* New modifications: (1) modify resistors to limit divider current below 1 mA  (2) Increase voltages on first dynodes
 
* New modifications: (1) modify resistors to limit divider current below 1 mA  (2) Increase voltages on first dynodes
:: - [https://halldweb.jlab.org/detectors/fcal2/dividers/vlad_modify/New_DIV.pdf  Resistor values][https://halldweb.jlab.org/detectors/fcal2/dividers/vlad_modify/divider_resistors.xlsx ]
+
:: - [https://halldweb.jlab.org/detectors/fcal2/dividers/vlad_modify/New_DIV.pdf  Resistor values]
:: - [https://halldweb.jlab.org/detectors/fcal2/dividers/vlad_modify/Test_Vlads_new_resistor_values.pdf  Corresponding voltages]
+
 
:: - [https://logbooks.jlab.org/entry/3844449 New bases installed in the Hall]  Divider current after installation [https://logbooks.jlab.org/entry/3844569]  
 
:: - [https://logbooks.jlab.org/entry/3844449 New bases installed in the Hall]  Divider current after installation [https://logbooks.jlab.org/entry/3844569]  
 +
[https://halldweb.jlab.org/detectors/fcal2/dividers/vlad_modify/divider_resistors.xlsx ]
 +
:: - [https://halldweb.jlab.org/detectors/fcal2/dividers/vlad_modify/Test_Vlads_new_resistor_values.pdf  Corresponding voltages]
 +
  
 
* [https://halldweb.jlab.org/DocDB/0049/004981/004/amp_lin.pdf Linearity test of the modified amplifier (gain 3)]
 
* [https://halldweb.jlab.org/DocDB/0049/004981/004/amp_lin.pdf Linearity test of the modified amplifier (gain 3)]

Revision as of 15:13, 4 May 2021

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
- Resistor values
- New bases installed in the Hall Divider current after installation [1]

[2]

- Corresponding voltages


Documents

PMT lifetime studies at FNAL