Commissioning of a hybrid readout TPC test set-up and gas gain simulations

TL;DR

This paper reports on the development and commissioning of a hybrid readout TPC with optical and charge detection, and introduces a gas gain parametrization to streamline future simulations, enhancing high-resolution particle tracking for neutrino experiments.

Contribution

It presents the commissioning of a hybrid TPC setup with gas electron multipliers and develops an analytical gas gain model validated by measurements.

Findings

Successful commissioning of a hybrid TPC with optical and charge readout.

Development of a validated analytical gas gain parametrization.

Potential for improved particle tracking in neutrino experiments.

Abstract

A hybrid readout Time Projection Chamber (TPC) has a simultaneous optical- and charge readout. The optical readout provides 2D images of particle tracks in the active volume, whilst the charge readout provides additional information on the particle position perpendicular to the image plane. A hybrid readout TPC working at high pressure is an attractive device for physics cases where an excellent space point resolution and a high target density is required as e.g. measuring a neutrino beam at the source of a long baseline neutrino oscillation experiment. In this paper we present two different lines of work towards the goal of developing hybrid TPC technology: a) Commissioning of a set-up with gas electron multipliers employing optical and charge readout. b) An analytical parametrisation of the gas gain for a multi wire proportional chamber based on garfield++ simulations, which - when validated with measurements - allows to skip these simulations in the future altogether.