A new data concentrator for the CMS muon barrel track finder

The CMS muon trigger will undergo considerable enhancements in preparation for the LHC run-2. In order to improve rate reduction and efficiency the full muon trigger chain will be completely redesigned: the plan is to move from a redundant scheme, where the three sub-detectors (CSC, DT, RPC) have a separate track finder, to three geographical track finders (barrel, endcap and overlap) that combine trigger primitives of each sub-detector. In particular, the Muon Barrel Track Finder (MBTF) will host a new algorithm, that aggregating DT and RPC trigger data, will be able to improve the fake rejection and the muon momentum measurement. This report will focus on the adaptive layer of the MBTF called Twin Mux. Its primary role will be to merge, arrange and fan-out the slow optical links from the chambers in faster links (10 Gbps). It will realize a full connectivity matrix between the on-detector electronics and the MBTF allowing for different processing schemes. The Twin Mux will be implemented in μTCA form factor compliant with all the CMS standards in terms of clock distribution, slow control and data acquisition. The Twin Mux will be centered around a powerful Virtex-7 FPGA able to exchange data on up to 96 optical lanes. The gigabit connectivity on the backplane will guarantee the connection with the central DAQ, allowing the adoption of the Twin Mux as a read out board for DT as well.