Simulation on the Transparency of Electrons and Ion Back Flow for a Time Projection Chamber based on Staggered Multiple THGEMs

TL;DR

This paper uses Garfield++ simulations to optimize staggered multi-THGEM structures, significantly reducing ion back flow and increasing electron transparency for improved TPC performance.

Contribution

It introduces novel staggered multi-THGEM strategies with optimized geometries to suppress IBF and enhance electron transparency in TPCs.

Findings

Electron transparency exceeds 90% with optimized large holes.

IBF can be reduced to 0.2% in the 'ACBA' configuration.

Staggered THGEM strategies show potential for future TPC applications.

Abstract

The IBF and the transparent rate of electrons are two essential indicators of TPC, which affect the energy resolution and counting rate respectively. In this paper, we propose several novel strategies of staggered multi-THGEM to suppress IBF, where the geometry of the first layer THGEM will be optimized to increase the electron transparent rate. By Garfield++ simulation, the electron transparency rate can be more than 90% of single THGEM with a optimized large hole. By simulating these configurations of triple and quadruple THGEM structures, we conclude that the IBF can be reduced to 0.2% level in an optimized configuration denoted as "ACBA". This strategy for staggered THGEM could have potential applications in future TPC projects.