[Table of Contents]

Plasma and Fusion Research

Volume 6, 2405130 (2011)

Regular Articles

DT Fusion Ignition of LHD-Type Helical Reactor by Joule Heating Associated with Magnetic Axis Shift
Tsuguhiro WATANABE
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 6 December 2010 / Accepted 30 June 2011 / Published 26 August 2011)


A new concept to achieve current drive with magnetic axis shift, which is caused by vertical magnetic field coil current change in LHD-type magnetic configuration, is proposed. It is confirmed numerically that an LHD-type helical fusion reactor can be ignited by high-current Joule heating. MHD stability of the plasma current in a helical system is analyzed theoretically. Large plasma current that flows in the opposite direction of the helical coil current is MHD stable. Currents with a hollow current profile are more stable than those with a flat-top profile. The central peak current profile will be redistributed to the hollow current profile. A new concept involving the current-driven and current-less hybrid operational scenario of an LHD-type helical reactor is discussed.


LHD, fusion reactor, Joule heating, high beta, MHD stability

DOI: 10.1585/pfr.6.2405130


  • [1] T. Watanabe and A. Sagara, J. Plasma Fusion Res. SERIES 9, 118 (2010).
  • [2] J. Fujita et al., IEEE Trans. Plasma Sci. 9, 180 (1981).
  • [3] K. Sakurai et al., J. Phys. Soc. Jpn. 49, 759 (1980).
  • [4] S. Morimoto et al., Jpn. J. Appl. Phys. 25, 1445 (1986).
  • [5] U. Stroth et al., Nucl. Fusion 36, 1063 (1996).
  • [6] ITER Physics Basis Editors et al., Nucl. Fusion 39, 2137 (1999).
  • [7] T. Watanabe et al., Nucl. Fusion 46, 291 (2006).
  • [8] G. Bateman, MHD Instabilities, (MIT Press, Cambridge, Massachusetts, and London, England, 1980) p.38.
  • [9] T. Watanabe and H. Hojo, Plasma Fusion Res. 5, S2022 (2010).

This paper may be cited as follows:

Tsuguhiro WATANABE, Plasma Fusion Res. 6, 2405130 (2011).