Abstract
In 2015 the first full size resistive-strip Micromegas modules for the ATLAS New Small Wheel upgrade will be realized. The goal is to provide precision muon tracking with spatial resolution below 100 μm on trapezoidal four-layer detector modules with areas between 2 and 3 m2. This poses stringent limits on the overall accuracy of the modules with respect to strip positioning and planarity. Each module is built as a quadruplet of four resistive strip Micromegas layers, constructed from stiff sandwich panels. An assembly procedure has been developed to build the panels and modules with the required mechanical precision of 30 μm along the precision coordinate and 80 μm perpendicular to the chamber. The construction and quality assurance procedures ensure good module quality verified by checks done during the construction and the chamber assembly.
Highlights
ATLAS is a multi-purpose detector at the Large Hadron Collider (LHC) at CERN [1] with almost full solid angle coverage
In the central region of the endcap station, in the so called Small Wheel, that is closest to the interaction point, Cathode Strip Chambers are used
Resistive Plate Chambers provide the trigger in the barrel and Thin Gap Chambers in the endcap region of the muon spectrometer
Summary
ATLAS is a multi-purpose detector at the Large Hadron Collider (LHC) at CERN [1] with almost full solid angle coverage. The muon system represents the outermost layer of the detector It consists of separate tracking and triggering chambers in toroidal magnetic fields, enabling a standalone muon momentum measurement [2]. Resistive Plate Chambers provide the trigger in the barrel and Thin Gap Chambers in the endcap region of the muon spectrometer. The background hit rates by photons and neutrons increase and can reach up to 15 kHz/cm in the forward region of the muon spectrometer. In order to preserve the current muon triggering capabilities and momentum determination accuracy, the muon detectors in the Small Wheel need to be replaced. These chambers are shown in figure 1. The construction and quality control procedures for the first full size Micromegas modules of the New Small Wheel are described and discussed
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