Abstract
The increase of luminosity expected by LHC during Phase1 will impose tighter constraints for rate reduction in order to maintain high efficiency in the CMS Level1 trigger system. The TwinMux system is the early layer of the muon barrel region that concentrates the information from different subdetectors: Drift Tubes, Resistive Plate Chambers and Outer Hadron Calorimeter. It arranges the slow optical trigger links from the detector chambers into faster links (10 Gbps) that are sent in multiple copies to the track finders. Results from collision runs, that confirm the satisfactory operation of the trigger system up to the output of the barrel track finder, will be shown.
Highlights
The increase of luminosity expected by LHC during Phase 1 will impose several constrains for rate reduction while maintaining high efficiency in the Compact Muon Solenoid (CMS) Level 1 trigger system
In addition to the Cathode Strip Chambers (CSC) hits the Overlap Muon Track Finder (OMTF) receives Drift Tubes (DT) hits and Resistive Plate Chambers (RPC) hits via the concentrator pre-processor and fan-out (CPPF) and the TwinMux, which provides DT and RPC hits to the Barrel Muon Track Finder (BMTF) [5]
TwinMux is in charge of sending such combined primitive to the BMTF and, in addition, the RPC and DT data are sent to the OMTF after applying a clusterization of the RPC hits
Summary
In view of the increase of luminosity due to Phase upgrade of LHC, the muon trigger chain of CMS underwent considerable improvements. The upgrade introduced a regional segmentation that treats muon tracks separately depending on η It distinguishes a barrel region (low η), an endcap region (high η) and a transition region between them (|η| ∼ 1) called overlap. In the legacy system the muon port card, the sector collector, and the link boards sent the CSC, DT and RPC hits or primitives to the respective track finders (pattern comparator in RPC case). In the upgraded system hits from the CSCs are sent to the Endcap Muon Track Finder. In addition to the CSC hits the OMTF receives DT hits and RPC hits via the CPPF and the TwinMux, which provides DT and RPC hits to the Barrel Muon Track Finder (BMTF) [5]. At present (during Run-II) CPPF has not been deployed yet and HO is not connected to TwinMux yet
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