Long-term Temporal Stability of the DarkSide-50 Dark Matter Detector

P. Agnes,I. F. M. Albuquerque，C. Yang,G. Zuzel

JOURNAL OF INSTRUMENTATION（2024）

Cited 0|Views34

Abstract

The stability of a dark matter detector on the timescale of a few years is a key requirement due to the large exposure needed to achieve a competitive sensitivity. It is especially crucial to enable the detector to potentially detect any annual event rate modulation, an expected dark matter signature. In this work, we present the performance history of the DarkSide-50 dual-phase argon time projection chamber over its almost three-year low-radioactivity argon run. In particular, we focus on the electroluminescence signal that enables sensitivity to sub-keV energy depositions. The stability of the electroluminescence yield is found to be better than 0.5%. Finally, we show the temporal evolution of the observed event rate around the sub-keV region being consistent to the background prediction.

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Key words

Dark Matter detectors (WIMPs, axions, etc.),Time projection chambers

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【要点】：本文报告了DarkSide-50暗物质探测器近三年低放射性氩气运行期间性能的历史，特别关注电致发光信号，以提高对亚千电子伏特能量沉积的探测灵敏度，其电致发光产出的稳定性超过0.5%，事件率的时间演变与背景预测一致，突显了该探测器长期时间稳定性。

【方法】：通过分析DarkSide-50双相氩时间投影室在低放射性氩气环境中的运行数据，评估其性能稳定性。

【实验】：实验使用DarkSide-50探测器监测亚千电子伏特能量区域的 event rate，在近三年的运行中保持稳定，数据与背景预测相符。

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