Abstract
The high pseudo-rapidity region of the CMS muon system is covered by Cathode Strip Chambers (CSC) only and lacks redundant coverage despite the fact that it is a challenging region for muons in terms of backgrounds and momentum resolution. In order to maintain good efficiency for the muon trigger in this region additional RPCs are planned to be installed in the two outermost stations at low angle named RE3/1 and RE4/1. These stations will use RPCs with finer granularity and good timing resolution to mitigate background effects and to increase the redundancy of the system.
Highlights
The high pseudo-rapidity region of the CMS muon system is covered by Cathode Strip Chambers (CSC) only and lacks redundant coverage despite the fact that it is a challenging region for muons in terms of backgrounds and momentum resolution
The final technique adopted for the upgrade of the CMS Muon System may combine the benefits of the different approaches
Several options for new front-end electronics are being developed, and studies are ongoing to integrate the new electronics into the CMS Trigger and DAQ system
Summary
As RPCs are resistive detectors, increasing the rate capability of the new generation via a reduction of their electrode’s resistivity is a first possibility to be investigated in order to accelerate the charge recombination at the level of the electrode’s surface. Equipping RPCs with more sensitive front-end electronics and moving a part of the amplification to the electronics would allow to work at lower voltages. Another solution would be to improve the current CMS RPC design. Changing the number of electrodes or their thickness could yield a better ratio of induced signal to moving charge. By combining these different techniques, a reduction of the voltage drop over the electrodes is expected with improvements on both rate capability and aging of the detector
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