Abstract
A key component of the CMS (Compact Muon Solenoid) experiment is its muon system. The tracking and triggering of muons in the central part relies on Drift Tube (DT) chambers. In 2013 and 2014 a number of improvements and upgrades were implemented, in particular concerning the readout and trigger electronics. The increase of luminosity expected by LHC will impose several constraints for rate reduction while maintaining high efficiency in the CMS Level 1 trigger system. In order to exploit the muon detector redundancy, a new trigger system has been designed. The TwinMux system is the early layer of the muon barrel region that combines the primitives information from different subdetectors: DT, Resistive Plate Chambers (RPC) and Outer Hadron Calorimeter (HO). Regarding the long term operation of the DT system, in order to cope with up to a factor 2 nominal LHC luminosity, several improvements will be implemented. The in-chamber local electronics will be modified to cope with the new rate and radiation environment. This paper will present, along with the main system improvements implemented in the system, the first performance results from data collected at 13 TeV center-of-mass energy during 2016, confirming the satisfactory operation of both DT performance and the TwinMux system. A review of the present status and plans for the DT system upgrades will be also described.
Highlights
Wheel 0The Drift Tube (DT) efficiency to detect a single hit (Fig.4) was defined and measured as the ratio between the number of detected and expected hits
A key component of the CMS (Compact Muon Solenoid) experiment is its muon system
The TwinMux system is the early layer of the muon barrel region that combines the primitives information from different subdetectors: Drift Tube (DT), Resistive Plate Chambers (RPC) and Outer Hadron
Summary
The DT efficiency to detect a single hit (Fig.4) was defined and measured as the ratio between the number of detected and expected hits. The position of expected hits was determined using sets of well reconstructed track segments: at least 7 or at least 3 hits were required to be associated to a segment, in the φ and θ view respectively The intersection of such a high quality track segment with a DT layer determined the position of the expected hit. In the θ layers the resolution is always better than 500 μm except in the external wheels of MB1 (because of the track inclination and the effect of the transverse component of the magnetic field [2])
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