Field dependence of electronic recoil signals in a dual-phase liquid xenon time projection chamber

TL;DR

This study measures how light and charge signals in a dual-phase liquid xenon detector vary with electric field, providing insights into detector performance for particle physics experiments.

Contribution

It offers detailed measurements of light and charge yields, drift velocity, and scintillation decay times across a range of electric fields in a liquid xenon TPC.

Findings

Drift velocity increases with electric field.

Scintillation decay time decreases at higher fields.

Electron lifetime and diffusion constants are characterized.

Abstract

We present measurements of light and charge signals in a dual-phase time projection chamber at electric fields varying from 10 V/cm up to 500 V/cm and at zero field using 511 keV gamma rays from a $^{22}$Na source. We determine the drift velocity, electron lifetime, diffusion constant, and light and charge yields at 511 keV as a function of the electric field. In addition, we fit the scintillation pulse shape to an effective exponential model, showing a decay time of 43.5 ns at low field that decreases to 25 ns at high fields.