# MPGD simulation in negative-ion gas for direction-sensitive dark matter searches

## TL;DR

This paper develops and validates a simulation method for micro pattern gaseous detectors in negative-ion gases, specifically SF6, to enhance the design of direction-sensitive dark matter detectors using negative-ion TPCs.

## Contribution

It introduces a novel MPGD simulation approach for negative-ion gases with Garfield++, supported by experimental validation, aiding future dark matter detector development.

## Key findings

- Successful simulation of MPGD behavior in SF6 gas
- Experimental validation of gain and energy resolution
- Enhanced understanding for NITPC optimization

## Abstract

Negative-ion time projection chambers (NITPCs) provide the absolute z-position from the arrival-times' difference of several species of negative-ions. This is a strong background reduction method for rare event searches, such as direct dark mater searches. The characteristics of micro pattern gaseous detectors (MPGDs) in negative-ion gas were studied by both experiments and simulations to develop an NITPC for dark matter search experiments. An MPGD simulation method for the negative-ion gas with Garfield++, which has not yet been established, was developed. We present herein the MPGD simulation results in negative-ion gas, $\mathrm{SF_{6}}$ gas, together with the experimental results, such as gain, energy resolution, and signal creation from the MPGD for future NITPC optimization.