Passive cyclotron current generation with fish‐scale structures

The paper presents a theoretical and a numerical treatment of the problem of passive current drive in a fusion plasma. In such a scenario the current is driven by the self‐generated cyclotron radiation. The necessary asymmetry is introduced with the help of fish‐scale structures on the reflecting wa...

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Bibliographic Details
Published inPhysics of plasmas Vol. 3; no. 11; pp. 4128 - 4139
Main Authors Kernbichler, W., Kasilov, S. V.
Format Journal Article
LanguageEnglish
Published 01.11.1996
Subjects
TOKAMAK DEVICES
FREDHOLM EQUATION
CURRENT−DRIVE HEATING
PHOTONS
WALL EFFECTS
EFFICIENCY
RADIATION TRANSPORT
CYCLOTRON RADIATION
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ISSN1070-664X
1089-7674
DOI10.1063/1.871545

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Summary:The paper presents a theoretical and a numerical treatment of the problem of passive current drive in a fusion plasma. In such a scenario the current is driven by the self‐generated cyclotron radiation. The necessary asymmetry is introduced with the help of fish‐scale structures on the reflecting wall which surrounds the plasma. The problem of the photon equilibrium in a bounded system is the subject of the first part of this paper. The general case of a plasma surrounded by a reflecting wall is presented in the form of a Fredholm integral equation of the second kind. This integral equation is then simplified for small fish‐scale‐like structures on the first wall with the help of a probabilistic approach. A self‐consistent solution for the radiation intensity distribution is obtained numerically for a cylindrical plasma model under such boundary conditions. Based on this and on local current drive efficiencies derived in a companion paper [S. V. Kasilov and W. Kernbichler, Phys. Plasmas, 3, 4115 (1996)], the radial profile of a steady toroidal current as well as overall efficiencies are computed.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.871545