ITER 15 MA方案相对于α鱼骨的线性稳定性
Linear stability of the ITER 15 MA scenario against the alpha fishbone
摘要：
利用非线性混合动力学-磁流体动力学程序XTOR-K对ITER 15 MA基线方案\cite{ITERB}上的$n=m=1$ α-鱼骨形动力学-磁流体动力学模式的稳定性进行了分析。在\cite{Brochard2018}和XTOR-K的线性模拟中用线性模型计算的复频率$ω+ iγ$之间发现定量一致性。线性模型和XTOR-K模型在相空间中的进动共振位置相同。用XTOR-K对ITER 15 MA方案进行的线性混合模拟表明，这种配置可能对alpha鱼骨模式不稳定。具有平坦q剖面且轴上安全系数略低于1的动力学-MHD平衡的鱼骨阈值介于$β_{α,thres}/β_{tot} = 6-10\%$之间，而ITER上预期的β比为$β_α/β_{tot} = 15-20\%$ \cite{ITERB}。
英文摘要：
The stability of the $n=m=1$ alpha-fishbone kinetic-MHD mode on the ITER 15 MA baseline scenario \cite{ITERB} is analyzed using the nonlinear hybrid Kinetic-MHD code XTOR-K. Quantitative agreement is found between the complex frequencies $ω+ iγ$ computed with the linear model in \cite{Brochard2018} 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 $β_{α,thres}/β_{tot} = 6-10\%$, whereas the expected beta ratio on ITER is $β_α/β_{tot} = 15-20\%$ \cite{ITERB}.
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