Preliminary test results of LAr prototype detector

TL;DR

This paper presents initial test results of a liquid argon detector prototype designed for WIMP dark matter detection, focusing on its technology, calibration, and operational stability.

Contribution

It introduces a liquid argon detector prototype with specific cooling and purification systems, and reports its calibration results for dark matter detection applications.

Findings

Light yield of 1.591±0.019 p.e./keV for 511 keV gamma rays

Stable temperature maintenance within 0.1 K fluctuations

Successful calibration with Na$^{22}$ source

Abstract

WIMPs are a well-motivated galactic dark matter candidate. Liquid argon (LAr) is an attractive target for the direct detection of WIMPs. The LAr prototype detector is designed to study the technology and property of LAr detector. The prototype detector have an active volume containing 0.65 kg of liquid argon. The liquid nitrogen(LN) cooling system allows the temperature of liquid argon to be maintained at the boiling point (87.8 K) with fluctuations less than 0.1 K. The prototype was calibrated with a Na$^{22}$ source, with the light yield 1.591$\pm$0.019 p.e./keV for the 511 keV gamma rays using the domestic-made argon purification system.