Abstract
The μ-RWELL is a single-amplification stage resistive Micro-Pattern Gaseous Detector (MPGD) . The detector amplification element is realized with a single copper-clad polyimide foil micro-patterned with a blind hole (well) matrix and embedded in the readout PCB through a thin Diamond-Like-Carbon (DLC) sputtered resistive film. The introduction of the resistive layer, suppressing the transition from streamer to spark, allows to achieve large gains (⩾104) with a single amplification stage, while partially reducing the capability to stand high particle fluxes. The simplest resistive layout, designed for low-rate applications, is based on a single-resistive layer with edge grounding. At high particle fluxes this layout suffers of a non-uniform response. In order to get rid of such a limitation different current evacuation geometries have been designed. In this work we report the study of the performance of several high rate resistive layouts tested at the CERN H8-SpS and PSI πM1 beam test facilities. These layouts fulfill the requirements for the detectors at the HL-LHC and for the experiments at the next generation colliders FCC-ee/hh and CepC.
Highlights
: The μ-RWELL is a single-amplification stage resistive Micro-Pattern Gaseous Detector (MPGD)
In this work we report the study of the performance of several high rate resistive layouts tested at the CERN
The black calibration curve has been obtained by sputtering the DLC on a brand-new Apical® foil, while the open square markers refer to the μ-RWELL 2017 test production done on a pre-dried base material (200◦C for ∼2 hours)
Summary
The DLC sputtering technology is typically used in applications (mechanics, automotive and medical industry) that require surface hardening and reduced abrasive wear. Starting from a target of graphite, magnetron-sputtered on one side of the Apical® foil, the DLC film is eventually obtained with suitable surface resistivity and uniform thickness. The black calibration curve has been obtained by sputtering the DLC on a brand-new Apical® foil, while the open square markers refer to the μ-RWELL 2017 test production done on a pre-dried base material (200◦C for ∼2 hours). Very recent developments [10] at USTC-Hefei (PRC) led to the manufacturing of DLC+Cu sputtered Apical® foils, where additional few microns of copper cover the free surface of the DLC layer. This technology opens the way towards improved high rate μ-RWELL layouts
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