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Finite-orbit-width effects on energetic-particle-induced geodesic acoustic mode

高速粒子駆動測地線音響モードの有限軌道幅効果

三木 一弘; 井戸村 泰宏  

Miki, Kazuhiro; Idomura, Yasuhiro

ジャイロ運動論をもとにした固有値解析より高速粒子駆動測地線音響モード(EGAM)の線形特性を調べた。摂動ジャイロ運動論方程式に高速粒子の効果を加えて、EGAMの分散関係を導出した。根の特性はq値によって変化する。有限軌道幅効果を考慮に入れて、EGAMの成長率のビーム強度依存を調べた。解析より、実験装置に典型的なパラメータ領域においては有限軌道幅効果は高々数%と小さいことが分かった。

We identify linear properties of the energetic-particle-induced geodesic acoustic mode (EGAM) using eigenmode analysis based on the gyrokinetic theory. From the perturbed gyrokinetic equation with energetic particles, we derive a dispersion relation of the EGAM. The behaviors of the roots vary depending on the safety factor. Taking into account of the finite-orbit-width (FOW) effects, we examine variations of the growth rates of the EGAM for various beam intensities. The analyses indicate that the FOW effects are small, within several percent of the growth rates, for experimentally relevant machine sizes.

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