Commissioning of CMS Forward Hadron Calorimeters with Upgraded Multi-anode PMTs and $u$TCA Readout
February 06, 2017
April 19, 2017
The high flux of charged particles interacting with the CMS Forward Hadron Calorimeter PMT windows introduced a significant background for the trigger and offline data analysis. During Long Shutdown 1, all of the original PMTs were replaced with multi-anode, thin window photo- multiplier tubes. At the same time, the back-end electronic readout system was upgraded to μ TCA readout. The experience with commissioning and calibration of the Forward Hadron Calorimeter is described as well as the μTCA system. The upgrade was successful and provided quality data for Run 2 data-analysis at 13 TeV.
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