Construction and Test of New Precision Drift-Tube Chambers for Upgrades of the ATLAS Muon Spectrometer in 2016/17

TL;DR

This paper details the design, construction, and testing of new small-diameter Muon Drift Tube chambers for the ATLAS detector upgrade, enhancing rate capability and precision for improved muon detection.

Contribution

It introduces a new design and optimized assembly methods for sMDT chambers with improved wire positioning accuracy, suitable for mass production and detector upgrade.

Findings

Chambers achieved wire positioning accuracy below ten microns.

Enhanced rate capability and compact design enable coverage of uninstrumented regions.

Chambers are ready for installation in the 2016/17 LHC upgrade shutdown.

Abstract

Small-diameter Muon Drift Tube (sMDT) chambers have been developed for the ATLAS muon detector upgrade. They possess an improved rate capability and a more compact design with respect to the existing chambers, which allows to equip detector regions uninstrument at present. The chamber assembly methods have been optimized for mass production, while the sense wire positioning accuracy is improved to below ten microns. The chambers will be ready for installation in the winter shutdown 2016/17 of the Large Hadron Collider. The design and construction of the new sMDT chambers for ATLAS will be discussed as well as measurements of their precision and performance.