Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (2): 20603-020603.doi: 10.11889/j.0253-3219.2016.hjs.39.020603

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Measuring tokamak plasma impurity density by spectroscopic method

SHEN Yongcai1,2, FU Jia2, LYU Bo2,3, WU Bin2, SHI Yuejiang4,5, LI Yingying2, WANG Fudi2, CUI Zhengying6   

  1. 1 School of Physics and Electrical Engineering of Anqing Normal College, Anqing 246011, China;
    2 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
    3 Hefei Science Center, Chinese Academy of Sciences, Hefei 230031, China;
    4 School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China;
    5 Department of Nuclear Engineering, Seoul National University, Seoul 151-742, Korea;
    6 Southwestern Institute of Physics, Chengdu 610041, China
  • Received:2015-12-22 Revised:2016-01-11 Online:2016-02-10 Published:2016-02-17
  • Supported by:

    Supported by National Magnetic Confinement Fusion Science Program of China (No.2013GB112004, No.2015GB103002), National Natural Science Foundation of China (No.11275231, No.11405212), Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology (No.2014FXCX003), Hefei Science Center CAS Users with Potential Project (No.2015HSC-UP007), Doctoral Research Program of Anqing Normal College (Anqing Normal College [044-140001000024])

Abstract:

Background: Impurity density measurement is very important in tokamak plasma, especially for impurity behavior and transport study. Purpose: This study aims to obtain the impurity density of tokamak plasma by using passive spectroscopy diagnostics. Methods: Line emissions of impurity are measured by passive spectroscopy diagnostics, and the chord-integrated brightness profiles are obtained by multiplying the sensitivity calibration coefficients. The radial emissivity profiles corresponding to a certain number of considered magnetic surfaces can be obtained by using the version technique. Then the density profiles of impurity ions can be acquired according to the relationship of emissivity profiles and density profiles of impurity ions. And the total impurity density distribution can be calculated by the simulation of impurity transport code. Results: Experimental results on obtaining of total molybdenum density on experimental advanced superconducting tokamak (EAST) by soft X-ray and extreme ultraviolet spectrometers (XEUV) show the total measureing error is less than 10%. Conclusion: Impurity density can be measured by using spectroscopic method, combining spectroscopy diagnostics and impurity transport code.

Key words: Tokamak plasma, Passive spectroscopy diagnostics, Emissivity, Impurity transport, Impurity density

CLC Number: 

  • TL65.1