Plasma and Fusion Research

Volume 16, 2403049 (2021)

Regular Articles

Numerical Simulation Study of the Magnetic Flux Tube Expansion on the Divertor Plasma Parameters by the LINDA Code
Md. Shahinul ISLAM, Yousuke NAKASHIMA1), Seiji ISHIGURO, Kazuo HOSHINO2), Akiyoshi HATAYAMA2), Hiroki HASEGAWA and Mizuki SAKAMOTO
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
1)
Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
2)
Graduate School of Science and Technology, Keio University, Hiyoshi, Yokohama 223-8522, Japan
(Received 22 October 2020 / Accepted 16 February 2021 / Published 19 March 2021)

Abstract

In this research, we investigate the effect of magnetic flux tube expansion on the divertor plasma parameters by using the fluid code “LINDA”. A comparison between the cylindrical flux tube (without the magnetic flux expansion) and the expansion magnetic flux tube has been undertaken. The aim of the study is to understand the impact of magnetic field expansion on the divertor physics by using the LINDA fluid code. The plasma density (ni) is decreased and parallel velocity is increased (ui||) toward the target plate with the expansion of magnetic field lines near the target plate. The heat and particle fluxes are reduced significantly on the target plate in the case of the expansion mesh configuration. For the case of cylindrical mesh, advection becomes stronger with the decreasing distance from the target plate. In the case of expansion mesh, diffusion is stronger with the decreasing distance from the target plate. These outcomes clearly indicate the effect of the magnetic field structure on the divertor plasma parameters.

Keywords

fluid simulation, LINDA code, plasma detachment, magnetic flux expansion, heat flux, ion flux

DOI: 10.1585/pfr.16.2403049

Full Text

PDF format (1.3Mbytes) PDF Download

References

  • [1] P.C. Stangeby, Plasma Phys. Control. Fusion 43, 223 (2000).
  • [2] A. Loarte et al., Nucl. Fusion 47, S203 (2007).
  • [3] A. Kallenbach et al., Plasma Phys. Control. Fusion 58, 045013 (2016).
  • [4] S. Takamura et al., J. Plasma Fusion Res. 4, 138 (2001).
  • [5] N. Ohno, Plasma Phys. Control. Fusion 59, 034007 (2017).
  • [6] M.S. Islam et al., Nucl. Mater. Energy 18, 182 (2019).
  • [7] M.S. Islam et al., Fusion Eng. Des. 125, 216 (2017).
  • [8] M.S. Islam et al., Plasma Phys. Control. Fusion 61, 125005 (2019).
  • [9] M.S. Islam et al., Plasma Fusion Res. 13, 3403080 (2018).
  • [10] M.S. Islam et al., Contrib. Plasma Phys. 58, 805 (2018).
  • [11] M.S. Islam et al., Plasma Phys. Control. Fusion 59, 125010 (2017).
  • [12] B.J. Braams, NET Rep. 68 EURFU/X-80/87/68, CEC, Brussels (1987).
  • [13] D.E. Post et al., J. Nucl. Mater. 220, 143 (1995).