江门中微子实验的低能量阈值和多信使触发系统
A Low-energy Threshold and Multi-messenger Trigger System for the JUNO Experiment
中文总结 AI 辅助
介绍江门中微子实验的多信使触发系统,通过提供更低能量阈值和独立监测能力扩展全局触发功能,运行中实现约110±10keV有效阈值,还开发天体物理监测器等,对约250kpc内超新星中微子爆发敏感。
中文摘要 AI 辅助
江门中微子实验(JUNO)是一个20千吨的液体闪烁体中微子探测器,位于中国广东江门地下650米(1800米水等效)处。它主要用于反应堆中微子测量,自2025年起开始采集数据。凭借同类中最大的质量和出色的能量分辨率,JUNO是高精度测量MeV中微子的领先观测站。标准的全局触发系统是JUNO的主要触发装置。我们提出了一种新开发的多信使触发系统,通过提供更低的能量阈值和独立监测能力来扩展全局触发的功能。在2025年运行期间,它实现了约110±10keV的有效能量阈值,提供了适合低能事件分析的低阈值配置。该系统显示出进一步将阈值降低到远低于100keV的潜力。基于多信使触发系统,开发了一个天体物理监测器来接收和处理来自其他信使(如引力波观测)的外部警报。集成了一个瞬态中微子爆发监测器来检测短时间尺度的中微子爆发事件,并能够实时监测瞬态天体物理现象。该系统对距离约250kpc内的核心坍缩超新星产生的中微子爆发敏感。
英文摘要
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20-kiloton liquid scintillator neutrino detector, located 650 meters (1800 m.w.e.) underground in Jiangmen, Guangdong, China. JUNO is primarily designed for reactor neutrino measurements and has been taking data since 2025. With the largest mass of its kind and an excellent energy resolution, JUNO is a leading observatory for high-precision measurements of MeV neutrinos. The standard global trigger system serves as the primary trigger for JUNO. We present a newly developed multi-messenger trigger system that extends the capabilities of the global trigger by providing a lower energy threshold and an independent monitoring capability. During the 2025 operation, it achieved an effective energy threshold of approximately 110 +/- 10 keV, providing a lower threshold configuration suitable for low-energy event analysis. The system shows the potential to further reduce the threshold to well below 100 keV. Based on the multi-messenger trigger system, an astrophysical monitor has been developed to receive and process external alerts from other messengers, such as gravitational-wave observations. A Transient Neutrino Burst Monitor is integrated to detect short-time-scale neutrino burst events and enables real-time monitoring of transient astrophysical phenomena. The system is sensitive to neutrino bursts from core-collapse supernovae within a distance of about 250 kpc.