Influence of radial electric field on trajectories of plug potential bounce ion in the tandem mirror |
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Authors: | K Ishii A Fueki Y Takemura A Kojima H Hagisawa I Katanuma K Yatsu |
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Institution: | (1) Plasma Research Center, University of Tsukuba, 305-8577 Ibaraki, Japan |
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Abstract: | Bouncing ions between the plug potentials play an important role in improvement of the axial confinement in the tandem mirror.
We examined the influence of the radial electric field on the trajectories of the ions passed through the anchor cell with
nonaxisymmetric magnetic configuration on the assumption that the shape of the magnetic flux tube was shifted from the shape
of the equipotential surface of the plasma at the mirror throats of the anchor cells. The discrepancy between the shapes enhanced
the radial drift of the bounce ion. Radial potential profile of the core plasma was controlled by adjustment of the radially
separated endplate potentials, and it was found that the flattened radial potential profile was effective for the decrease
of the radial drift.
Presented at 5th Workshop “Role of Electric Fields in Plasma Confinement and Exhaust”, Montreux, Switzerland, June 23–24,
2002. |
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Keywords: | 52 55 Jd 52 25 Fi |
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