Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (7): 0-070606-6.doi: 10.11889/j.0253-3219.2019.hjs.42.070606


Radiation shielding design for X-ray of the CFETR NNBI prototype

Mengting LI1,2,Chundong HU1,2,Yahong XIE1,Yuqing CHEN1(),Bin WU1   

  1. 1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
    2. University of Science and Technology of China, Hefei 230026, China
  • Received:2019-03-11 Revised:2019-05-21 Online:2019-07-10 Published:2019-07-16
  • Contact: Yuqing CHEN
  • About author:LI Mengting, female, born in 1994, graduated from Chengdu University of Technology in 2016, master student, focusing on analysis of radiation characteristics of neutral beam system
  • Supported by:
    Supported by the National Key R&D Program of China (No.2017YFE300101, No.2017YFE0300503), National Natural Science Foundation of China(No.11705229, No.11675215, No.11675216, No.11875290)

Abstract: Background

China fusion engineering test reactor (CFETR) negative ion based neutral beam injection system (NNBI) prototype was designed for hydrogen beam operation. When the NNBI prototype works, the energetic particles collide with the solid targets of the prototype structural material during production and transmission to produce bremsstrahlung. When the CFETR NNBI prototype is designed to operate with a beam energy of 200 keV and beam current of 20 A, the dose rate outside the vacuum wall is higher than the limit dose rates of general worker radiation (10 μSv?h-1).


This study aims to reduce the radiation dose rate of the CFETR NNBI with hydrogen beam energy of 200 keV.


The radiation dose of the prototype was simulated by the radiation shielding theory. The shielding design scheme of sinking the prototype with lead plate was put forward and evaluated.


When the CFETR NNBI is placed underground and shielding layer on the top, the outside dose rate at 1 m from vacuum wall (with 2 cm thickness) of ion source (200 keV, 20 A) is below the limit.


The design scheme can meet the radiation safety standards when the CFETR NNBI prototype operated with radiation shielding.

Key words: CFETR neutral beam test facility, Radiation dose, Radiation shielding

CLC Number: 

  • TL69