The micro-Resistive WELL detector for the phase-2 upgrade of the LHCb muon detector

摘要

The mu-RWELL is a new generation Micro-Pattern Gaseous Detector, composed of two elements: the cathode and the mu-RWELL_PCB including the amplification stage, realized with a polyimide structure micro-patterned with a blind-hole matrix, embedded through a Diamond-Like Carbon (DLC) resistive layer with the readout PCB. Different layouts of the resistive stage have been studied: the simplest one is based on a single DLC layer with edge grounding, suitable for low rate applications (30-40 kHz/cm(2)). More sophisticated schemes are under study for high-rate purposes (up to 2-3 MHz/cm(2)) in order to optimize the performance and the constructive process. For the phase-2 upgrade of the LHCb muon detector the experiment is targeting a luminosity of 2 x 10(34) cm(-2) s(-1), with strong requirements on the robustness and detection efficiency of the muon system. We report on the ongoing R&D, showing also the latest measured performances of the new high-rate versions of the detector.