基于嵌入式EPICS的中子监测仪研制

针对合肥光源（HLS-Ⅱ）辐射防护与安全需求，且合肥光源的控制系统是基于EPICS架构，为减少辐射监测系统中间的环节，提高合肥光源人身安全联锁可靠性，研制了基于嵌入式EPICS控制系统的中子监测仪。中子监测仪的关键部件-探测器选用BF₃针对合肥光源（HLS-Ⅱ）辐射防护与安全需求，研制了基于嵌入式EPICS的中子监测仪，用于场所与环境辐射场中子的监测。合肥光源的控制系统是基于EPICS架构，为减少辐射监测系统中间的环节，提高合肥光源人身安全联锁可靠性，研制了基于嵌入式EPICS控制系统的中子监测仪。中子监测仪的关键部件-探测器选用BF₃正比计数管，通过对正比计数管产生的微弱电信号加2 kV的正高压偏置，交流耦合介入前置放大器放大，后输出固定宽度的脉冲信号。信号由CORTEX-M3电路计数，后经CORTEX-A8电路处理后将数据发布到局域网。利用镅铍中子源和合肥光源现场辐射环境对所研制的监测仪性能进行了初步测试，结果表明，该监测仪达到设计要求，可用于中子监测。

Development of a neutron monitor based on embedded EPICS

Aiming at the radiation protection and safety requirements of HLS-II (HLS-Ⅱ), a neutron monitor based on embedded EPICS was developed for neutron monitoring of radiation field and environment. The control system of HLS-II is based on EPICS (Experimental Physics and Industrial Control System) architecture. In order to reduce the middle link of the radiation monitoring system and improve the reliability of the personal safety chain of HLS-II, a neutron monitor based on embedded EPICS control system was developed. The key component of the neutron monitor-detector is the BF₃ proportional counter tube. By adding a 2 kV positive high voltage bias to the weak electrical signal generated by the proportional counter tube, the AC coupling intervenes in the preamplifier for amplification, and then outputs a pulse signal with a fixed width. The signal is counted by the CORTEX-M3 circuit, and then processed by the CORTEX-A8 circuit to publish the data to the local area network. The performance of the developed monitor has been preliminarily tested by using Am-Be neutron source and on-site radiation environment of HLS-II. The results show that the monitor meets the design requirements and can be used for neutron monitoring.