Design and optimization of resistive anode for a two-dimensional imaging triple-GEM detector

TL;DR

This paper presents the design and optimization of a resistive anode for a 2D imaging triple-GEM detector, combining simulations and experiments to improve spatial resolution and imaging performance.

Contribution

It introduces an optimized resistive anode design with specific resistance ratios and pad dimensions, enhancing detector performance over previous configurations.

Findings

Optimal resistance ratio of pad to strip should be >5

Pad surface resistivity nonuniformity should be <20%

Spatial resolution of about 105 μm achieved with 6mm pad width

Abstract

The optimization of resistive anode for two dimensional imaging detectors which consists of a series of high resistive square pads surrounding by low resistive strips has been studied by both numerical simulations and experimental tests. It has been found that to obtain good detector performance, the resistance ratio of the pad to the strip should be larger than 5, the nonuniformity of the pad surface resistivity had better be less than $20\%$, a smaller pad width leads to a smaller spatial resolution and when the pad width is $6mm$, the spatial resolution ($\sigma$) can reach about $105{\mu}m$. Based on the study results, a 2-D GEM detector prototype with the optimized resistive anode is constructed and a good imaging performance is achieved.