CMS Hadron Forward Calorimeter Phase I Upgrade Status

The CMS Hadronic Forward Calorimeter has undergone upgrade maintenance during the LHC Long Shutdown 1. The Hamamatsu R7525 PMTs have been replaced with Hamamatsu R7600U-200-M4 PMTs, which have thinner window glass that reduces window- hit events. The R7600 PMTs also have multi-anode readout feature...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 587; no. 1; pp. 12007 - 12
Main Author Onel, Yasar
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.01.2015
Subjects
Anodes
Calibration
Electronics
Energy recovery
Hadrons
Large Hadron Collider
Physics
Quantum efficiency
Shutdowns
Solenoids
Solvents
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Summary:The CMS Hadronic Forward Calorimeter has undergone upgrade maintenance during the LHC Long Shutdown 1. The Hamamatsu R7525 PMTs have been replaced with Hamamatsu R7600U-200-M4 PMTs, which have thinner window glass that reduces window- hit events. The R7600 PMTs also have multi-anode readout feature to further enable discrimination of window-hits while also allowing the recovery of true signal energy. Higher quantum efficiency of the R7600 PMTs improves calorimeter resolution. The new PMTs were tested and calibrated; new PMT baseboards were designed and tested, and can be configured to readout 1, 2, or 4 anodes of the R7600. New radiation hard (100Gy) QIE front-end electronics were designed for reading out the new PMTs and include a TDC with < 800ps resolution. New back-end electronics based on the microTCA industrial standard have been tested.
Bibliography:ObjectType-Article-1
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ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/587/1/012007