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Consequences of toroidal effects in lower hybrid heating of tokamaks

S. Bernabei, D.W. Ignat1982年被引用 16Nuclear FusionIF 3出版社

The lower hybrid slow wave tends to follow magnetic field lines. Therefore, a generalization of Snell's Law modifies the wavelength along the magnetic field as the wave moves inward from an exciter through regions of varying magnetic field strength. Predicting the consequences requires a numerical treatment, which has been developed in recent years by several authors. This paper searches for some general statements on the problem by analysing many particular cases, without allowing for scattering, multiple traverses of the plasma radius and non-linear effects. We find that the range of parameters suitable for ion heating varies from that predicted by simple estimates and is dependent on launch position; and that electron heating including current drive is best pursued with unidirectional launching from a coupler at the top (or bottom) of the torus if the wave frequency is close to the linear mode conversion condition.

日本語訳

低ハイブリッド低速波は磁力線に沿って進む傾向がある。したがって、スネルの法則の一般化により、励起器から内側へ進む波が磁場強度の変化する領域を通過する際の波長の変化が記述される。その結果を予測するには数値的取り扱いが必要であり、近年いくつかの研究者によって開発が進められている。本論文では、多数の具体的事例を分析することにより、散乱、プラズマ半径の複数回横断、非線形効果を考慮せずに、いくつかの一般的な命題を探求する。イオン加熱に適したパラメータ範囲は、単純な予測から得られる範囲とは異なり、励起位置に依存することが見出された。また、電子加熱(電流駆動を含む)は、波の周波数が線形モード変換条件に近い場合、トーラス上部(または下部)の結合器からの一方向励起によって最も効果的に達成される。

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