[show abstract][hide abstract] ABSTRACT: The Compact Muon Solenoid (CMS) detector is described. The detector operates at the Large Hadron Collider (LHC) at CERN. It was conceived to study proton-proton (and lead-lead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 1034 cm−2 s−1 (1027 cm−2 s−1). At the core of the CMS detector sits a high-magnetic-field and large-bore superconducting solenoid surrounding an all-silicon pixel and strip tracker, a lead-tungstate scintillating-crystals electromagnetic calorimeter, and a brass-scintillator sampling hadron calorimeter. The iron yoke of the flux-return is instrumented with four stations of muon detectors covering most of the 4π solid angle. Forward sampling calorimeters extend the pseudorapidity coverage to high values (|η| ≤ 5) assuring very good hermeticity. The overall dimensions of the CMS detector are a length of 21.6 m, a diameter of 14.6 m and a total weight of 12500 t.
Journal of Instrumentation 08/2008; 3(08):S08004. · 1.66 Impact Factor
[show abstract][hide abstract] ABSTRACT: In order to check the system aspects of the forward–backward MSGC tracker designed for the future CMS experiment at LHC, 38 trapezoidal MSGC counters assembled in six multi-substrates detector modules were built and exposed to a muon beam at the CERN SPS. Results on the gain uniformity along the wedge-shaped strip pattern and across the detector modules are shown together with measurements of the detection efficiency and the spatial resolution.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 01/1999;
[show abstract][hide abstract] ABSTRACT: We describe comparative laboratory and beam test measurements of identical MSGC and GEM-equipped MSGCs. Both kinds of detectors have been tested under exactly the same conditions, using radioactive sources and muon beams. The principal aim of this comparative study was to evaluate the operating conditions for the same resulting gain. Results on efficiencies and spatial resolution are presented. Possible applications of GEM-equipped MSGCs in the LHC environment and the R&D studies needed are discussed.
[show abstract][hide abstract] ABSTRACT: We report on the performance of Micro-Gap Chambers is manufactured at Strasbourg. We present measurements of gain as a function of various operating parameters, such as high voltages and various gas mixtures. With the optimal mixture of Ne–DME (70–30%), a cathode voltage of −500V and a drift voltage of −2900V, a gain of ∼3000 is achieved. Performance of Micro-Gap Chambers is compared to that of Micro-Strip Gas Chambers.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment - NUCL INSTRUM METH PHYS RES A. 01/1998; 414(2):283-288.
[show abstract][hide abstract] ABSTRACT: The CMS MF1 milestone was set in order to evaluate system aspects of the CMS forward-backward MSGC tracker, to check the design and feasibility of mass production and to set up assembly and test procedures. We describe the construction and the experience gained with the operation of a system of 38 MSGC detectors assembled in six multi-substrate detector modules corresponding to the geometry of the forward-backward MSGC tracker in CMS. These modules were equipped with MSGCs mounted side by side, forming a continuous detector surface of about 0.2 m2. Different designs were tried for these modules. The problems encountered are presented with the proposed solutions. Operation conditions for the 38 MSGCs are reported from an exposure to a muon beam at the CERN SPS. Gain uniformity along the wedge-shaped strip pattern and across the detector modules are shown together with the detection efficiency, the spatial resolution, alignment and edge studies.