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

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 936; pp. 497 - 498
• Main Authors: Morello, G., Bencivenni, G., De Oliveira, R., Felici, G., Gatta, M., Poli Lener, M., Ochi, A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 21-08-2019
• Subjects: [formula omitted]-RWELL; Micro-pattern Gas Detectors; Tracking detectors; μ-RWELL; Micro-pattern Gas Detectors; Tracking detectors
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2018.11.078

The μ-RWELL is a new generation Micro-Pattern Gaseous Detector, composed of two elements: the cathode and the μ-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/cm2). More sophisticated schemes are under study for high-rate purposes (up to 2–3 MHz/cm2) 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 2×1034 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.