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Detector Upgrade R&D of the CMS Hadronic Endcap and Forward Calorimeters

Summary: Detector Upgrade R&D of the CMS Hadronic
Endcap and Forward Calorimeters
Ugur Akgun (for the CMS Collaboration)
Abstract­The CMS Hadronic Endcap (HE) and Hadronic
Forward (HF) calorimeters cover the pseudorapidity range of
from 1.4 to 5 on both sides of the CMS detector, contributing to
superior jet and missing transverse energy resolutions. Here we
discuss possible upgrade scenarios for both calorimeters. Recent
studies revealed abnormally high amplitude signals due to punch
through charged particles, mostly muons, producing Cherenkov
photons at the HF calorimeter PMT window. Our studies show
that these events can be eliminated either by using the timing
properties, or replacing the HF PMTs with new generation four
anode PMTs. As the integrated luminosity of the LHC increases,
the scintillator tiles used in the CMS Hadronic Endcap
calorimeter will lose their efficiency. This report outlines two
possible radiation hard upgrade scenarios based on replacing the
HE scintillators with quartz plates.
HE Compact Muon Solenoid (CMS) [1] is a general-


Source: Akgun, Ugur - Department of Physics and Astronomy, University of Iowa


Collections: Physics