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Monte Carlo simulation of minority ion bootstrap current by off-axis ion cyclotron heating in tokamaks

J.A. Heikkinen, S.K. Sipila1997年被引用 9Nuclear FusionIF 3出版社

The characteristics of the ion current driven by localized minority ion cyclotron heating in tokamaks in the presence of a well enhanced high energy tail are examined by fully toroidal Monte Carlo guiding centre simulations. The contribution of the diamagnetic current to the minority current drive has been found to be of importance as it dominates the resulting fast ion current in the presence of significant toroidal trapping of RF heated minority ions, and also because it is excited even with symmetric launching, thus requiring no directivity in the antenna system. The driven currents from the simulation are compared with a functional form approximating the trapped ion contribution to the minority ion diamagnetic current in the strong heating limit. The bidirectional current profile, the dependence on wave intensity and the increase of the current generation efficiency with electron temperature and with the inverse major radius as predicted by the Monte Carlo simulations are satisfactorily reproduced by the estimate

日本語訳

トカマクにおける局所化された少数派イオンサイクロトロン加熱によって駆動されるイオン電流の特性を、完全トロイダル・モンテカルロ・ガイディングセンターシミュレーションを用いて調べた。少数派イオン電流駆動に対する反磁性電流の寄与は、RF加熱された少数派イオンの顕著なトロイダル閉じ込めが存在する場合に支配的となるため重要であり、また、対称的な励起であっても反磁性電流が発生するため、アンテナ系の指向性は不要となる。シミュレーションによって得られた駆動電流は、強い加熱極限における少数派イオンの反磁性電流への閉じ込め粒子の寄与を近似する関数形と比較された。双方向電流分布、波動強度への依存性、および電子温度と主要半径の逆数に対する電流生成効率の増加は、モンテカルロシミュレーションの結果と推定式によって良好に再現された。

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Ion cyclotron heatingMonte CarloBootstrap current
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