ATLAS RPC Cosmic Ray Teststand at INFN Lecce

We describe the design and functionality of the cosmic ray teststand built at INFN Lecce for ATLAS RPC quality control assurance.Comment: XXIV Physics in Collisions Conference (PIC04), Boston, USA, June 2004, 3 pages, LaTex, 2 eps figures. MONP0

The Cherenkov Telescope Array Large Size Telescope

The two arrays of the Very High Energy gamma-ray observatory Cherenkov Telescope Array (CTA) will include four Large Size Telescopes (LSTs) each with a 23 m diameter dish and 28 m focal distance. These telescopes will enable CTA to achieve a low-energy threshold of 20 GeV, which is critical for important studies in astrophysics, astroparticle physics and cosmology. This work presents the key specifications and performance of the current LST design in the light of the CTA scientific objectives.Comment: 4 pages, 5 figures, In Proceedings of the 33rd International Cosmic Ray Conference (ICRC2013), Rio de Janeiro (Brazil). All CTA contributions at arXiv:1307.223

Design of the FCC-hh Muon Detector and Trigger System

The design of a muon detector and first-level muon trigger system for the FCC-hh baseline experiment is presented. The baseline FCC-hh detector configuration with a solenoid magnet system providing a field integral of 18 Tm over a wide pseudorapidity interval and a muon system around the solenoid and the calorimeter system is assumed. In order to identify muons with high momentum resolution one needs to measure the muon incidence angle at the entry point of the muon system with an angular resolution better than 100 µrad. This precision can be achieved with chambers with two quadruple layers which are separated by a 1.5 m thick spacer structure and contain 15 mm diameter aluminium drift tubes filled with Ar:CO(93:7) at 3 bars absolute pressure. Each drift-tube chamber is combined with a double layer of thin-gap RPC chambers which provide bunch crossing identification with better than 1 ns time resolution, muon trigger seeds, and coordinate measurement along the tubes

Conceptual design of the ATLAS EM muon chamber support structures

The conceptual design of the support structures of the EM muon chambers is presented. On each side of the detector the EM chambers are arranged in four layers: one layer of MDTs and the three layers of TGCs. The chambers are mounted on four individual wheel structures per side. The four wheels are inclined by 1.23% and suspended from two longitudinal beams parallel to the beam axis. In order to allow for the opening of the ATLAS detector the wheels can be displaced longitudinally over a distance of 6 m. In addition individual wheels can be separated from each other by up to 1 m for maintenance purposes

Upgrades of the ATLAS Muon Spectrometer with New Small-Diameter Drift Tube Chambers

Small diameter muon drift-tube (sMDT) chambers with 15 mm tube diameter provide excellent spatial resolution like the MDT chambers with 30 mm tube diameter used in the ATLAS muon spectrometer so far, but can be operated at ten times higher background rates and allow for the instrumentation of regions where MDT chambers do not fit in. In April 2014 two BME and in January 2016 another 12 BMG sMDT chambers have been installed in the middle layer of the barrel muon detector and are operational since then in order to increase the acceptance for precision muon momentum measurement using three chamber layers. An unprecedently high sense wire positioning accuracy of 5 micron (rms) has been achieved. In the next long LHC shutdown 2019-2020, 16 BIS78 sMDT chambers will be installed in the barrel inner layer in the transition region to inner endcap layer to make room for the installation of new RPC muon trigger chambers in order to reduce the accidential trigger rate in this region as required for operation at HL-LHC. This is a pilot project for the complete replacement of the MDT chambers in the small sectors of the barrel inner layer by integrated sMDT-RPC detectors (BIS1-6) in the ATLAS upgrade for HL-LHC

CombLines for Assembly of MDT Chambers for ATLAS Experiment

A description of manufacturing technique of comblines for drift tubes gluing during assembly of MDT chambers for ATLAS experiment is presented. Under the requirements of quality control, tolerances of the coordinates of signal wires in assembled chambers should not exceed 20 micron. The comblines for tube fixation that were made satisfy these requirements. The gluing procedure of the combs is described, results of control measurements during comb manufacturing are given, and also the diagram of distribution of the signal wire coordinates in the assembled chamber "Module0" is shown

Study of the ATLAS MDT spectrometer using high energy CERN combined test beam data

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