Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (11): 110602-110602.doi: 10.11889/j.0253-3219.2015.hjs.38.110602

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Radiation monitoring system for EAST tokamak

LI Kai ZHONG Guoqiang HU Liqun LIU Guangzhu ZHOU Ruijie PU Neng   

  1. (Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China)
  • Received:2015-09-15 Revised:2015-10-20 Online:2015-11-10 Published:2015-11-13

Abstract: Background: During the experiment of Experimental Advanced Superconducting Tokamak (EAST), reaction of D-D may generate neutrons with energy of 2.45 MeV, and bremsstrahlung gamma rays and neutron activated gamma rays as well. Purpose: The aim is to study the radiation of neutrons and gamma rays in the EAST hall during the running of EAST tokamak and obtain the radiation doses under different modes and parameters by implementing a radiation monitoring system to diagnose some plasma parameters and ensure the radiation safety of the personnel and the environment around EAST. Methods: In consideration of the highly and transient radiation doses of neutrons and gamma rays contrast to the lowly environmental background during the plasma discharge in the EAST hall, the combination of high ranging and fast responding detectors are adopted in the EAST hall whilst high sensitivity and stability detectors are deployed in the environment. Thirteen monitoring points were selected around the EAST, each point contains a neutron detector and a gamma ray detector. Combination of Ethernet and twisted pair are adopted for the data transmission, and the radiation monitoring software based on LabVIEW was developed. Results: A radiation monitoring system of EAST tokamak was successfully built to monitor and save the real-time radiation dose rates of each detector, and to produce an alarm signal when abnormal dose rate happens. The radiation monitoring system had run stably for more than three months during the EAST experiment in the spring of 2015, and obtained many useful experimental data on fusion radiation safety and protection. Conclusion: The radiation monitoring system can well monitor the radiation around the EAST tokamak, and provide a platform for the future study of radiation safety and protection of the fusion reactor.

Key words: EAST, Tokamak, Radiation monitoring, Neutron, Gamma ray