Design of a high voltage delivery system for noble liquid time projection chambers

TL;DR

This paper presents a comprehensive design approach for a high voltage delivery system tailored for noble liquid TPCs, emphasizing stability, safety, and radiopurity for advanced particle physics experiments.

Contribution

It introduces a novel HV delivery system concept specifically designed for the nEXO experiment, incorporating stability and radiopurity considerations based on prior research.

Findings

Enhanced HV stability in noble liquid TPCs

Design guidelines for HV systems in large detectors

Prototype implementation demonstrating improved performance

Abstract

Noble liquid time projection chambers (TPCs) are a leading technology in the detection of ionizing radiation, particularly in applications such as accelerator neutrino physics, dark matter detection, and neutrinoless double beta decay. This paper addresses the design considerations for implementing stable high voltage (HV) systems within large noble liquid TPCs, with a focus on the nEXO experiment. Utilizing insights from prior HV research and experimental investigations, we outline factors influencing HV stability and discuss design choices to improve stability and prevent electrical discharges. A novel HV delivery system concept is presented, tailored for the nEXO TPC, which incorporates these design considerations while also meeting the stringent radiopurity requirements of the nEXO neutrinoless double beta decay search. These design considerations and their specific implementation towards a HV delivery system offer guidance to future experiments applying high voltage in noble liquid environments.