Abstract
In this work we present a novel idea for a compact spark-protected single amplification stage Micro-Pattern Gas Detector (MPGD). The detector amplification stage, realized with a structure very similar to a GEM foil, is embedded through a resistive layer in the readout board. A cathode electrode, defining the gas conversion/drift gap, completes the detector mechanics. The new structure, that we call micro-Resistive WELL (μ-RWELL), has some characteristics in common with previous MPGDs, such as C.A.T. and WELL, developed more than ten years ago. The prototype object of the present study has been realized in the 2009 by TE-MPE-EM Workshop at CERN. The new architecture is a very compact MPGD, robust against discharges and exhibiting a large gain (∼ 6 × 103), simple to construct and easy for engineering and then suitable for large area tracking devices as well as huge calorimetric apparata.
Highlights
The main goal of our project is the development of a novel Micro-Pattern Gas Detector (MPGD) by combining in a unique approach the solutions and improvements realized in the last years in the MPGD field: a very compact detector structure, robust against discharges and exhibiting large gains, easy to build, cost effective and suitable for mass production
The μ-RWELL detector investigated in this work shows several advantages: small thickness, effective spark quenching, very simple assembly procedure, besides of good gas gain (G∼6000) and rate capability ranging for X-rays from 100 kHz/cm2 to 600 kHz/cm2 (G∼2000 and a surface resistivity of about 100 MΩ/ )
Larger gas gain could be achieved using thicker kapton foils for the realization of the μ-RWELL structure
Summary
The μ-RWELL prototype, as sketched in figure 1, is realized by merging a suitable etched GEM foil with the readout PCB plane coated with a resistive deposition. The μ-RWELL prototype, as sketched, is realized by merging a suitable etched GEM foil with the readout PCB plane coated with a resistive deposition. In a single-GEM detector only ∼50% of the electron charge produced inside the holes contributes to the formation of the signal, while the rest of the electron charge is collected by the lower side of the GEM foil. In addition the signal in a GEM detector is mainly due to the electron motion, because the ion component is largely shielded by the GEM foil itself and the avalanche is confined in the holes. In a μ-RWELL the whole electron charge produced into the amplification channel is promptly collected on the resistive layer (capacitively coupled with the readout plane) through the copper dot. In figures 5, 6 some details of the μ-RWELL PCB and the prototype are respectively shown
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