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Alpha-Particle Confinement Control of the Geodesic Winding of LHD-Type Fusion Reactors

Tsuguhiro WATANABE

National Institute for Fusion Science, Toki 509-5292, Japan

(Received 15 November 2012 / Accepted 9 April 2013 / Published 19 June 2013)

Abstract

It is calculated that the geodesic winding D-shaped helical magnetic field configuration can actively control the confinement and exhaust of alpha particles. A trapped particle orbit diagram (TPOD), which shows the presence of re-entering particles and specifies the loss-cone depth, is obtained from the deeply trapped particle orbits in a helical mirror magnetic field. The loss-cone depth becomes shallow when the magnetic axis is shifted to the inner side. On the other hand, the loss-cone depth can reach to the magnetic axis when the magnetic axis is shifted fairly to the outer side. Active control of the confinement and exhaust of 3.52 MeV alpha particles by controlling the magnetic axis position is also confirmed by collisionless orbit calculations.

Copyright (c) 2013 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

LHD, FFHR, geodesic winding, 3.52 MeV alpha particle, ash exhaust

DOI: 10.1585/pfr.8.2403072

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References

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This paper may be cited as follows:

Tsuguhiro WATANABE, Plasma Fusion Res. 8, 2403072 (2013).