[Table of Contents]

Plasma and Fusion Research

Volume 6, 2402107 (2011)

Regular Articles

Experimental Check of Deceleration of Neutral Beam-Injected Energetic Ions in the HL-2A Tokamak
Mitsutaka ISOBE, Yi LIU1), Guoliang YUAN1), Yipo ZHANG1), Jinwei YANG1), Wei CHEN1), Qingwei YANG1), Xuru DUAN1), Shigeru MORITA and Kazuo TOI
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
1)
Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
(Received 27 December 2010 / Accepted 18 March 2011 / Published 27 July 2011)

Abstract

Short pulses of a deuterium neutral beam (NB) with a duration of less than ∼ 5 ms were co-injected into magnetohydrodynamic (MHD)-quiescent ohmic deuterium plasmas of the HL-2A tokamak to study the variation of the slowing-down time in two different electron temperature environments. Analyses were made for the decay rate of D-D neutrons produced by beam-plasma interaction following NB turn-off, i.e., experimentally observed neutron decay rates were compared with those predicted by a classical slowing-down model. The results suggest the beam ions decelerate without significant loss in the HL-2A tokamak in round terms. When the critical energy for beam ions is higher than the beam injection energy, it seems that a small fraction of the beam ions is lost.

Keywords

HL-2A, NBI, deuterium, energetic ion, neutron, beam blip

DOI: 10.1585/pfr.6.2402107

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References

  • [1] W.W. Heidbrink and G.J. Sadler, Nucl. Fusion 34, 535 (1994).
  • [2] A. Fasoli et al., Nucl. Fusion 47, S264 (2007).
  • [3] W. Chen et al., Nucl. Fusion 50, 084008 (2010).
  • [4] W.W. Heidbrink et al., Nucl. Fusion 28, 1987 (1988); W.W. Heidbrink, Phys. Fluids B 2, 4 (1990).
  • [5] W.W. Heidbrink et al., Phys. Fluids B 3, 3167 (1991).
  • [6] K. Tobita et al., Nucl. Fusion 34, 1097 (1994); K. Tobita et al., Nucl. Fusion 35, 1585 (1995).
  • [7] M. Isobe et al., J. Plasma Fusion Res. SERIES 1, 366 (1998).
  • [8] M. Isobe et al., Chin. Phys. Lett. 26, 105201 (2009).
  • [9] He Liu et al., Plasma Sci. Technol. 11, 613 (2009).
  • [10] J.W. Yang et al., Plasma Sci. Technol. 7, 2860 (2005).
  • [11] J.D. Strachan et al., Nucl. Fusion 21, 67 (1981).
  • [12] S. Günter et al., Nucl. Fusion 47, 920 (2007).
  • [13] W.W. Heidbrink et al., Phys. Rev. Lett. 103, 175001 (2009).

This paper may be cited as follows:

Mitsutaka ISOBE, Yi LIU, Guoliang YUAN, Yipo ZHANG, Jinwei YANG, Wei CHEN, Qingwei YANG, Xuru DUAN, Shigeru MORITA and Kazuo TOI, Plasma Fusion Res. 6, 2402107 (2011).