Performance Studies of Bulk Micromegas of Different Design Parameters

TL;DR

This study compares the performance of various bulk Micromegas detectors with different design parameters, analyzing how changes in amplification gap and mesh pitch affect key detector characteristics through experiments and simulations.

Contribution

It provides a detailed comparison of Micromegas detectors with different design parameters using experimental measurements and numerical simulations, which is novel in understanding their performance.

Findings

Gain varies with amplification gap and mesh pitch.

Energy resolution depends on detector geometry.

Simulations closely match experimental results.

Abstract

The present work involves the comparison of various bulk Micromegas detectors having different design parameters. Six detectors with amplification gaps of $64,~128,~192,~220 ~\mu\mathrm{m}$ and mesh hole pitch of $63,~78 ~\mu\mathrm{m}$ were tested at room temperature and normal gas pressure. Two setups were built to evaluate the effect of the variation of the amplification gap and mesh hole pitch on different detector characteristics. The gain, energy resolution and electron transmission of these Micromegas detectors were measured in Argon-Isobutane (90:10) gas mixture while the measurements of the ion backflow were carried out in P10 gas. These measured characteristics have been compared in detail to the numerical simulations using the Garfield framework that combines packages such as neBEM, Magboltz and Heed.