Plasma and Fusion Research

Volume 13, 1403119 (2018)

Regular Articles

Analytic Representation for Parallel Flow of Hot Ions Produced by Tangential Neutral Beam Injection
Junya SHIRAISHI, Takahiro SUZUKI, Naoaki MIYATO1) and Go MATSUNAGA
National Institutes for Quantum and Radiological Science and Technology, Naka 311-0193, Japan
1)
National Institutes for Quantum and Radiological Science and Technology, Rokkasho 039-3212, Japan
(Received 7 June 2018 / Accepted 12 September 2018 / Published 23 October 2018)

Abstract

Tangential neutral beam injection deposits momentum in a fusion plasma, which produces macroscopic flow of bulk particles. Concurrently, equilibrium distribution of hot ions produced by the injection is determined by collisions with the bulk particles. Through these processes, macroscopic flow of hot ions can be produced. Effects of the flow of hot ions have not been focused on since their inertial force is thought to be much smaller than the bulk one due to smallness of density of hot ions. In this study, we derive an analytic representation for parallel flow of hot ions. From the analytic representation, we find that amplitude of the parallel flow is determined by three parameters, injection speed, injection pitch angle, and electron temperature. Also we find that the inertial force of hot ions is not negligible even if the density of hot ions is much smaller than that of bulk ions.

Keywords

hot ion, flow, neutral beam injection, slowing-down distribution, inertial force of hot ions

DOI: 10.1585/pfr.13.1403119

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References

  • [1] J.D. Gaffey, Jr., J. Plasma Phys. 16, 149 (1976).
  • [2] L. Chen, R.B. White and M.N. Rosenbluth, Phys. Rev. Lett. 52, 1122 (1984).
  • [3] F. Porcelli, R. Stankiewicz, W. Kerner and H.L. Berk, Phys. Plasmas 1, 470 (1994).
  • [4] G.Z. Hao, A.K. Wang, Y.Q. Liu and X.M. Qiu, Phys. Rev. Lett. 107, 015001 (2011).
  • [5] J. Shiraishi, N. Miyato, G. Matsunaga, M. Toma, M. Honda, T. Suzuki, M. Yoshida, N. Hayashi and S. Ide, Nucl. Fusion 57, 126051 (2017).
  • [6] P. Helander and D.J. Sigmar, Collisional Transport in Magnetized Plasmas (Cambridge University Press, Cambridge, 2002) Chap. 3.
  • [7] I.S. Gradshteyn and I.M. Ryzhik, Tables of Integrals, Series, and Products, Edited by A. Jeffrey and D. Zwillinger (Academic Press, New York, 2007), p. 790.
  • [8] I.S. Gradshteyn and I.M. Ryzhik, Tables of Integrals, Series, and Products, Edited by A. Jeffrey and D. Zwillinger (Academic Press, New York, 2007), p. 315.
  • [9] ITER Physics Expert Group on Energetic Particles, Heating and Current Drive and ITER Physics Editors, Nucl. Fusion 39, 2495 (1999).
  • [10] J. Wesson, Tokamaks, 2nd Ed. (Oxford University Press, Oxford, 1997), Sec. 3.13.