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Linear stability of the ITER 15 MA scenario against the alpha fishbone

G. Brochard, R. Dumont, H. Lütjens, X. Garbet2020年被引用 6Nuclear FusionIF 3出版社

The stability of the n = m = 1 alpha-fishbone kinetic-MHD mode on the ITER 15 MA baseline scenario (ITER Physics Expert Group on Energe Drive and ITER Physics Basis 1999 Nucl. Fusion39 2471–95) is analyzed using the non-linear hybrid kinetic-MHD code XTOR-K. Quantitative agreement is found between the complex frequencies ω + iγ computed with the linear model in (Brochard G. et al 2018 J. Phys.: Conf. Series1125 012003) and XTOR-K's linear simulations. Identical precessional resonance positions in phase space are also found between the linear model and XTOR-K. Linear hybrid simulations performed with XTOR-K on the ITER 15 MA scenario reveal that this configuration is likely to be unstable against the alpha fishbone mode. The fishbone thresholds for kinetic-MHD equilibria with flat q profiles with on-axis safety factor just below unity lies between , whereas the expected beta ratio on ITER is (ITER Physics Expert Group on Energe Drive and ITER Physics Basis 1999 Nucl. Fusion39 2471–95).

日本語訳

ITER 15 MAベースラインシナリオ(ITER Physics Expert Group on Energe Drive and ITER Physics Basis 1999 Nucl. Fusion39 2471–95)におけるn = m = 1アルファフィッシュボーン運動論的MHDモードの安定性を、非線形ハイブリッド運動論的MHDコードXTOR-Kを用いて解析した。線形モデル(Brochard et al. 2018 J. Phys.: Conf. Series1125 012003)で計算された複素周波数ω + iγとXTOR-Kの線形シミュレーションの間で定量的な一致が得られた。また、線形モデルとXTOR-Kの間で、共鳴粒子の歳差運動共鳴位置も一致することが確認された。ITER 15 MAシナリオに対するXTOR-Kの線形ハイブリッドシミュレーションは、この配位がアルファフィッシュボーンモードに対して不安定である可能性が高いことを示している。安全係数が平坦で軸上安全係数が1未満の運動論的MHD平衡に対するフィッシュボーン不安定性の閾値は、ベータ比が[値]の範囲にある一方、ITERにおける予想ベータ比は[値]である(ITER Physics Expert Group on Energe Drive and ITER Physics Basis 1999 Nucl. Fusion39 2471–95)。

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