Commissioning and running experience with the CMS GE1/1 system

The CMS GE1/1 system was installed in October 2020 as part of the CMS endcap muon system upgrades for the high-luminosity LHC. Since then, GE1/1 has been commissioned, and it is now participating in the CMS data taking of the LHC Run 3. The 144 GE1/1 detectors are read-out by the VFAT3 chip, which communicates with the mu TCA backend through the versatile link. Each detector is equipped with 24 VFAT3, 3 GBTx, 3 VTRx, 2 VTTx, and a Virtex-6 FPGA. In this contribution, we present the commissioning and the running experience acquired over 2 years of operations with the CMS GE1/1 system. The electronics performance results are presented with an emphasis on the main issues encountered and how they have been addressed. We also briefly discuss the status of the future GE2/1 and ME0 GEM stations.

Automated summary

The CMS GE1/1 system was installed in October 2020 for the CMS endcap muon system upgrades. It has been commissioned and is now being used for data taking in the LHC Run 3. The system consists of 144 GE1/1 detectors read-out by VFAT3 chip, which communicates with the mu TCA backend. Each detector is equipped with VFAT3, GBTx, VTRx, VTTx, and a Virtex-6 FPGA. This paper presents the commissioning and running experience of the CMS GE1/1 system over 2 years of operations, focusing on the electronic performance and addressing the main issues encountered. The status of future GE2/1 and ME0 GEM stations is also briefly discussed.