Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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A new Langmuir probe design to measure plasma properties and toroidal correlations on the EAST

  • Liuxin Li (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Wei Zhang (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Xinjun Zhang (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Lunan Liu (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Ning Yan (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Ning Yan (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Sichun Qiu (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Liangliang Li (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Zhengshuyan Wang (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Yuhao Jiang (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Chengming Qin (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences) ;
  • Ghassan Antar (American University of Beirut)
  • Received : 2024.01.24
  • Accepted : 2024.06.16
  • Published : 2024.11.25
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Abstract

We introduce a novel fast-reciprocating probe head installed on the EAST (Experiment Advanced Superconducting Tokamak) containing 12 graphite tips. This allows us to measure a variety of plasma parameters such as the plasma density, temperature, and space potential in the scrape-off layer (SOL). We will also acquire the data at high frequency thus measuring the ion saturation current, Isat, and the floating potential, Vf, average and fluctuating values. Moreover, with poloidally separated tips, we measure the poloidal electric field, Eθ, at two toroidal locations, assuming a plasma flow dominated by the E×B drift this leads to the determination of the radial velocity. As a consequence, the turbulent radial flux will thus be determined. In the parallel direction, we have four tips that are aligned parallel with the magnetic field lines, thus making an angle of 4°24' to the horizontal direction. This unique design should allow the measurement of the toroidal wavenumber, kφ, a quantity rarely obtained in tokamaks. This new probe, with 7 tips for measuring the ion saturation current and 4 tips to measure the floating potentials, was used on the EAST during the 2023 summer campaign. We present the first experimental results obtained during an L-mode plasma.

Keywords

Acknowledgement

The authors would like to thank the EAST tokamak team members for the EAST operation and experimental support, and other individuals for the design and fabrication of the fast-reciprocating probe system. This work was supported by the National Natural Science Foundation of China under grant No. 12175273, 12105184, 11975265, the National Magnetic Confinement Fusion Energy Development Research project under grant No. 2022YFE03190200, 2019YFE03070000, and the Comprehensive Research Facility for Fusion Technology Program of China under Contract No. 2018-000052-73-01001228.

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