Operation and Performance of the Upgraded CMS Calorimeter Trigger in LHC Run 2

The Large Hadron Collider (LHC) at CERN is preparing for the physics program for Run 2. The center-of-mass energy has risen from 8 to 13 TeV and the instantaneous luminosity will increase for both proton and heavy-ion running. This will make it more challenging to trigger on interesting events since the number of interactions per crossing (pile-up) and the overall trigger rate will be significantly larger than LHC Run 1. The Compact Muon Solenoid (CMS) experiment has installed a two-stage upgrade to their Calorimeter Trigger to ensure that the trigger rates can be controlled and the thresholds can stay low, so that physics data collection will not be compromised. The first-stage upgrade is installed and includes new electronics and duplicated optical links so that the LHC Run 1 CMS calorimeter trigger is still functional and algorithms can be developed while data taking continues. The second-stage will fully replace the calorimeter trigger at CMS with AMC form-factor boards and an optical link system, and require that the updates to the calorimeter back-ends, the source of the trigger primitives, are also installed and operational. The stage-2 systemâ??s boards will utilize Xilinx Virtex 7 FPGAs and have hundreds of high-speed links operating at up to 10 Gbps to maximize data throughput. The integration, commissioning, operation, and performance of stage-1 for 2015 data taking and stage-2 for triggering in 2016 will be described.