Electron transport and electric field simulations in two-phase detectors with THGEM electrodes

TL;DR

This paper presents simulations of electric fields and electron transport in two-phase detectors with THGEM electrodes, optimizing parameters for dark matter detection applications.

Contribution

It introduces detailed simulation results for THGEM-based two-phase detectors, identifying optimal geometries and voltages for efficient electron transmission and uniform electric fields.

Findings

Optimal THGEM hole diameter and voltage for electron transmission

Electric field uniformity depends on THGEM voltage in the EL gap

Simulations guide detector design for dark matter searches

Abstract

One of the main features of two-phase detectors with electroluminescence (EL) gap being developed in our laboratory for dark matter search is the extensive use of THGEMs (Thick Gas Electron Multipliers). In various versions of the detector, the THGEMs are used as electrodes in the gas and liquid phases to form the drift, electron emission and EL regions, as well as for avalanche amplification of a signal in the gas phase. In this work the simulations of the electric field and electron transport through such THGEM electrodes were performed. In the liquid phase, these simulations allowed to determine the optimal parameters, such as the hole diameter of THGEM and applied voltage across it, that can provide effective transmission of the electrons from the drift region to that of the EL gap. In the gas phase, the effect of the THGHEM voltage on the electric field uniformity in the EL gap was studied.