Instituto de Instrumentación para Imagen Molecular (I3M), Centro Mixto CSIC-Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.
Nuclear Engineering Unit, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 8410501, Israel.
Sensors (Basel). 2021 Jan 19;21(2):673. doi: 10.3390/s21020673.
This article describes the event detection system of the NEXT-White detector, a 5 kg high pressure xenon TPC with electroluminescent amplification, located in the Laboratorio Subterráneo de Canfranc (LSC), Spain. The detector is based on a plane of photomultipliers (PMTs) for energy measurements and a silicon photomultiplier (SiPM) tracking plane for offline topological event filtering. The event detection system, based on the SRS-ATCA data acquisition system developed in the framework of the CERN RD51 collaboration, has been designed to detect multiple events based on online PMT signal energy measurements and a coincidence-detection algorithm. Implemented on FPGA, the system has been successfully running and evolving during NEXT-White operation. The event detection system brings some relevant and new functionalities in the field. A distributed double event processor has been implemented to detect simultaneously two different types of events thus allowing simultaneous calibration and physics runs. This special feature provides constant monitoring of the detector conditions, being especially relevant to the lifetime and geometrical map computations which are needed to correct high-energy physics events. Other features, like primary scintillation event rejection, or a double buffer associated with the type of event being searched, help reduce the unnecessary data throughput thus minimizing dead time and improving trigger efficiency.
本文介绍了位于西班牙 Canfranc 地下实验室（LSC）的 NEXT-White 探测器的事件检测系统。该探测器是一个 5 公斤高压氙气 TPC，采用电致发光放大技术。探测器基于一个光电倍增管（PMT）平面进行能量测量，以及一个硅光电倍增管（SiPM）跟踪平面进行离线拓扑事件过滤。事件检测系统基于 CERN RD51 合作框架下开发的 SRS-ATCA 数据采集系统，旨在基于在线 PMT 信号能量测量和符合探测算法来检测多个事件。该系统在 FPGA 上实现，已成功在 NEXT-White 运行期间运行和发展。事件检测系统在该领域带来了一些相关的新功能。实现了分布式双事件处理器，可同时检测两种不同类型的事件，从而允许同时进行校准和物理运行。此特殊功能提供了对探测器状态的持续监控，对于需要校正高能物理事件的寿命和几何地图计算尤为重要。其他功能，如初级闪烁事件拒绝，或与正在搜索的事件类型相关的双缓冲区，有助于减少不必要的数据吞吐量，从而最小化死时间并提高触发效率。
