A hybrid structure gaseous detector for ion backflow suppression*

TL;DR

This paper introduces a novel hybrid gaseous detector combining GEM and Micromegas to effectively suppress ion backflow in time projection chambers for future colliders, demonstrating promising experimental results.

Contribution

It presents a new hybrid detector design that integrates GEM and Micromegas for improved ion backflow suppression and higher gas gain in TPCs.

Findings

Achieved energy resolution better than 27% at 5.9 keV.

Demonstrated ion backflow ratio below 0.2% at gain of 5000.

Validated the feasibility of the hybrid detector with experimental tests.

Abstract

A new concept for a hybrid structure gaseous detector module with ion backflow suppression for the time projection chamber in a future circular collider is presented. It is a hybrid structure cascaded Gas Electron Multiplier (GEM) with a Micromegas detector. Both Micromegas and GEM have the capability to naturally reduce most of the ions produced in the amplification region. The GEM also acts as the preamplifer device and increases gas gain together with the Micromegas. Feasibility tests of the hybrid detector are performed using an ${}^{55}$Fe X-ray source. The energy resolution is better than 27% for 5.9 keV X-rays. It is demonstrated that a backflow ratio better than 0.2% can be reached in the hybrid readout structure at a gain of 5000.