CMS Hadron Forward Calorimeter Phase I Upgrade Status

16th International Conference on Calorimetry in High Energy Physics

Onel, Yasar^1

University of Iowa, 203 Van Allen Hall, Iowa City

IA

52242, United States^1

关键词: Back ends;    Calorimeter resolutions;    Front end electronics;    Industrial standards;    MicroTCA;    Radiation hard;    Signal energy;    Window glass;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/587/1/012007/pdf
DOI  :  10.1088/1742-6596/587/1/012007

来源: IOP

【 摘 要 】

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