The RPC-based proposal for the ATLAS forward muon trigger upgrade in view of super-LHC

TL;DR

This paper proposes an upgraded ATLAS forward muon detector for super-LHC, combining sMDT chambers for precision tracking and mRPC stations for triggering, with modifications to RPCs to meet higher rate and timing demands.

Contribution

It introduces a novel detector layout with specific modifications to RPCs, tailored for super-LHC conditions, and evaluates their performance through detailed studies.

Findings

mRPC timing resolution meets super-LHC requirements

Modified RPCs achieve high rate capability

Detector layout enhances muon detection accuracy

Abstract

The innermost station of the present ATLAS forward muon detector needs to be upgraded for the super-LHC. We present a proposal to replace it with a sandwiched detector composed of several layers of small-radius Monitored Drift Tube chambers (sMDT) for precision tracking measurement and two stations of multi-gap Resistive Plate Chambers (mRPC) for triggering purpose. We describe the layout of the upgraded detector and the trigger strategy. Several modifications to the RPCs used in the ATLAS barrel region are needed to satisfy the super-LHC requirements. Various studies with the proposed mRPC timing resolution, spatial resolution and rate capability have been performed.