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The Axial Expansion of a Field-Reversed Configuration Plasma as Induced by Neutral-Beam-Injected Fast Ions

TAKAHASHI Toshiki, Naotaka IWASAWA ¹⁾, Takayuki KATO and Yoshiomi KONDOH

Department of Electronic Engineering, Gunma University

1)

SANDEN Corporation

(Received 16 February 2006 / Accepted 17 March 2006 / Published 25 April 2006)

Abstract

An axially expanding motion of a field-reversed configuration plasma can be observed numerically. This motion is induced by fast ions reciprocating between field-null x-points; the ions are injected obliquely from the axial end as neutral beam particles. A two-dimensional hybrid simulation is employed by assuming axisymmetry, where the beam ions are treated as particles and the plasma ions and electrons are treated as fluid. The diamagnetic beam current formed around the x-points and in the open-field region reduces the magnetic pressure, and then the plasma is found to expand axially.

Copyright (c) 2006 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

field-reversed conguration, neutral beam injection, hybrid simulation, diamagnetic beam current, axial expansion

DOI: 10.1585/pfr.1.022

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References

• [1] T. Asai et al., Phys. Plasmas 7, 2294 (2000)
• [2] T. Asai et al., Phys. Plasmas 10, 3608 (2003).
• [3] A.F. Lifschitz et al., Nucl. Fusion 44, 1015 (2004).

This paper may be cited as follows:

TAKAHASHI Toshiki, Naotaka IWASAWA , Takayuki KATO and Yoshiomi KONDOH , Plasma Fusion Res. 1, 022 (2006).