Study of Negative-Ion TPC Using {\mu}-PIC for Directional Dark Matter Search

TL;DR

This paper investigates negative-ion TPCs with {}-PIC+GEM systems for dark matter detection, demonstrating gas gain at low pressures and potential improvements in sensitivity and resolution for future experiments.

Contribution

It presents the first study of negative-ion TPCs using {}-PIC+GEM, showing promising gas gain and potential for enhanced dark matter search capabilities.

Findings

Achieved sufficient gas gain with CS₂ and SF₆ gases at low pressures.

Demonstrated potential for improved detector sensitivity.

Indicated prospects for better angular resolution with advanced electronics.

Abstract

Negative-ion time projection chambers(TPCs) have been studied for low-rate and high-resolution applications such as dark matter search experiments. Recently, a full volume fiducialization in a self-triggering TPC was realized. This innovative technology demonstrated a significant reduction in the background with MWPC-TPCs. We studied negative-ion TPC using the {\mu}-PIC+GEM system and obtained sufficient gas gain with CS$_{2}$gas and SF$_{6}$ gas at low pressures. We expect an improvement in detector sensitivity and angular resolution with better electronics.