Abstract
A full-size prototype of a Micromegas precision tracking chamber for the upgrade of the ATLAS detector at the LHC Collider has been built between October 2015 and April 2016. This paper describes in detail the procedures followed in the construction of the components of the chamber in various INFN laboratories and the final assembly in the Laboratori Nazionali di Frascati (LNF). In addition, the results of the chamber exposure to a particle beam at SPS/H8 at CERN in June 2016 are presented. The performances obtained in the construction and the results of the test beam are compared with the requirements set in order to sustain the high radiation levels expected during the data-taking of the LHC in the next years.
Highlights
In order to benefit from the expected high luminosity that will be provided by the Phase-I and High-Luminosity upgrades of LHC [1], the inner-Preprint submitted to Nuclear Instruments and Methods in Physics Research Section A most station of the ATLAS Muon Spectrometer in the small-sectors at large pseudorapidity η 2 (called the forward region (Small Wheel) will be replaced
Ground radiation environment The performances were checked in a test beam at while reconstructing muon tracks with high preci- CERN in June 2016
The Readout boards, the most important. Both the drift and read-out Printed Circuit Boards (PCB) are manufacand critical part of the detector, are constituted by tured by the industry with the resistive layers being an FR4 layer with etched readout copper strips, re- produced by Kobe University in Japan [11] and desistive strips and pillars, giving rise to the read-out livered to the PCB contractor. 4
Summary
In order to benefit from the expected high luminosity that will be provided by the Phase-I and High-Luminosity upgrades of LHC [1], the inner-. Ground radiation environment (up to 15 kHz/cm2) The performances were checked in a test beam at while reconstructing muon tracks with high preci- CERN in June 2016. In the following we present at first the general trigger. 1 trigger track segments have to be reconstructed panels (Sec.5), and the chamber assembly (Sec.). For this purpose a new set of detectors test beam facility, are described in Sec.. Have been designed and are being constructed for the conclusions are shown in Sec.. The New Small Wheel (NSW) [2]. The NSW chambers use two technologies, one primarily devoted to the Level-1 trigger function
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