A Novel Self-supporting GEM-based Amplification Structure for a Time Projection Chamber at the ILC

TL;DR

This paper introduces a lightweight, self-supporting GEM-based amplification structure for Time Projection Chambers, improving mechanical stability and coverage while minimizing dead zones, demonstrated through prototype testing with cosmic muons.

Contribution

It presents a novel ceramic grid mounting method for GEM foils that enhances stability and coverage in TPCs, with experimental validation.

Findings

Stable charge measurements achieved

Improved track reconstruction accuracy

Minimal dead zones in the detector design

Abstract

Modern time projection chambers are increasingly based on micro pattern gas detector readout systems. In this paper a self-supporting method used to mount Gas Electron Multiplier foils is presented. It is based on light weight ceramic grids, and promises to cover large readout areas with minimum dead zones and material, while ensuring a flat and mechanically stable mounting. The structure has been tested in a Time Projection Chamber prototype, using cosmic muon tracks. The impact of the mounting structure on the charge measurement, the track reconstruction and the single point resolution is quantified.