4π BaF_2装置的触发系统研究

Study of Trigger System for γ-ray Total Absorption BaF_2 Facility

设计了一套γ全吸收型BaF_2探测装置,用于中子辐射俘获反应截面的在线测量,其中信号测量部分采用了基于高速采集卡的数字化脉冲波形采集技术。并设计了一套触发系统,由触发单元产生的信号作为数据获取系统的外触发控制数据采集,以在数据测量过程中剔除绝大多数本底事件。触发系统采用了符合测量技术,通过多通道、多参数之间的符合测量,实现释放瞬发级联γ射线的中子俘获反应事件的判选和本底的剔除。本文对触发系统的电路设计和实验测试进行了阐述。

The γ-ray total absorption BaF_2 facility was designed to measure the crosssection of neutron radiative capture reaction by online method.The data acquisition system was developed based on flash analog-to-digital converter with an ability of digital waveform acquisition.The trigger system,in which the coincidence measurement technology between multi-channel and multi-parameter was applied,was used to control the data acquisition so as to suppress most of background event,by triggering the data acquisition system.In this paper,the circuit design and experimental test of the trigger system were described.