滨松R8520-506光电倍增管在液氩中的低温性能与长期稳定性

中文摘要 AI 辅助

对七只滨松R8520-506光电倍增管在室温和液氩中进行了表征，以评估其在液氩光读出中的响应和工作稳定性。使用405纳米脉冲光源测量增益、峰谷比、单光电子电荷分辨率和后脉冲，同时在无主动光照条件下通过随机触发获取暗计数数据。在液氩中为期十天的运行期间监测了增益和暗计数稳定性。在母板输入电压为900伏时，液氩中提取的增益比相应室温值高约27.8%至51.3%。对于所有七只管，液氩中的峰谷比更高，单光电子电荷分辨率有所改善。暗计数率在室温下约为143至252赫兹，在液氩中为166至199赫兹，其中三只管增加，四只管减少。液氩中每个选定的主事件检测到的平均后脉冲数约低21.0%至63.6%。增益和暗计数率的十个每日平均值之间的相对标准偏差分别不超过约2.1%和3.3%。这些测量为考虑将R8520-506管作为液氩探测器的光传感器候选提供了定量依据。

英文摘要

Seven Hamamatsu R8520-506 photomultiplier tubes were characterized at room temperature and in liquid argon to evaluate their response and operating stability for liquid-argon light readout. A 405~nm pulsed light source was used to measure gain, peak-to-valley ratio, single-photoelectron charge resolution, and afterpulsing, while dark-count data were acquired with random triggers in the absence of active illumination. Gain and dark-count stability were monitored during a ten-day operating period in liquid argon. At a motherboard input voltage of 900~V, the extracted gains in liquid argon were approximately 27.8\%--51.3\% higher than the corresponding room-temperature values. For all seven tubes, the peak-to-valley ratios were higher and the single-photoelectron charge resolution improved in liquid argon. The dark count rates ranged from approximately 143 to 252~Hz at room temperature and from 166 to 199~Hz in liquid argon, with three tubes showing increases and four showing decreases. The mean number of detected afterpulses per selected primary event was approximately 21.0\%--63.6\% lower in liquid argon. The relative standard deviations across the ten daily means of gain and dark count rate did not exceed approximately 2.1\% and 3.3\%, respectively. The measurements provide a quantitative basis for considering R8520-506 tubes as photosensor candidates for liquid-argon detectors.

发表机构

• Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）
• University of Chinese Academy of Sciences（中国科学院大学）
• Zhengzhou University（郑州大学）

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