May 16 – 20, 2022
Europe/Zurich timezone

Reduction of high voltage discharge in GEM detectors for the ME0 station of the CMS forward muon system

May 17, 2022, 7:00 PM
Experimental poster Upgrade & Future Projects Poster Session I


Salwa Mohamed (ENHEP Egyptian Network of High Energy Physics (EG))


The Phase 2 upgrade of the CMS muon spectrometer will include the installation of three new muon stations based on Gas Electron Multiplier (GEM) technology. One of the three stations, ME0, will increase the acceptance for muon detection in the region 2.03 < |η| < 2.82 where there is a high radiation background. When triple-GEM detectors, including ME0, operate at high gain, there are occasional discharges within the transfer gaps that are likely followed by less-common secondary discharges, and may cause irreversible damage to the detector. ME0 has the advantage of using double-segmented GEM foils that help lower the probability of high voltage discharges, and in turn, protect the detector and maintain high detection efficiency. To optimize the ME0 design, we studied the performance of several configurations of GEM foil design and high voltage filters regarding discharge propagation, rate capability, and crosstalk.

Primary authors

Salwa Mohamed (ENHEP Egyptian Network of High Energy Physics (EG)) Tamer Elkafrawy (Florida Institute of Technology (US)) Jeremie Alexandre Merlin (INFN-Bari)

Presentation materials