Study of gain variation as a function of physical parameters of GEM foil

TL;DR

This paper investigates how the gain of GEM foils varies with physical parameters like hole diameter, using simulations to inform quality assurance for detector upgrades in high-energy physics experiments.

Contribution

It presents a simulation-based study of gain variation as a function of hole geometry in GEM foils, aiding detector quality assurance.

Findings

Gain varies with hole diameter.

Simulation results inform quality control.

Insights into electric field effects inside GEM holes.

Abstract

The ALICE experiment at LHC has planned to upgrade the TPC by replacing the MWPC with GEM based detecting elements to restrict the IBF to a tolerable value. However the variation of the gain as a function of physical parameters of industrially produced large size GEM foils is needed to be studied as a part of the QA procedure for the detector. The size of the electron avalanche and consequently the gain for GEM based detectors depend on the electric field distribution inside the holes. Geometry of a hole plays an important role in defining the electric field inside it. In this work we have studied the variation of the gain as a function of the hole diameters using Garfield++ simulation package.