鱼骨诱导的α粒子输运计算ITER 15 MA基线方案，使用非线性混合动力学MHD代码XTOR-K。研究了两种极限情况，以分析鱼骨不稳定性的特征区域：弱动力驱动极限和强动力驱动极限。在这两个制度中，恢复的n = m = 1鱼骨不稳定性的特征，如一个强大的向上/向下啁啾的模式频率，与共振运输的捕获和通过α粒子。在模拟中考虑了n = m = 0剪切极向和环向等离子体旋转的影响。剪切不可忽略，这意味着鱼骨模式频率具有径向依赖性，影响波粒共振条件。在两个非线性制度，围绕岁差和通过共振相空间孔和块结构观察。当不同的模式频率上下啁啾时，这些结构保持附着于谐振。在非线性阶段，个别共振捕获粒子的运输被确定为链接到模式粒子同步。在此基础上，提出了粒子输运与模式主导下啁啾非线性耦合的部分机制。α粒子在q = 1表面内外的整体传输是模拟之间初始粒子数的2-5%。α功率的损失被发现直接等于α粒子的损失。
英文摘要：
The fishbone-induced transport of alpha particles is computed for the ITER 15 MA baseline scenario, using the nonlinear hybrid Kinetic-MHD code XTOR-K. Two limit cases have been studied, in order to analyse the characteristic regimes of the fishbone instability : the weak kinetic drive limit and the strong kinetic drive limit. In both those regimes, characteristic features of the n = m = 1 fishbone instability are recovered, such as a strong up/down-chirping of the mode frequency, associated with a resonant transport of trapped and passing alpha particles. The effects of the n = m = 0 sheared poloidal and toroidal plasma rotation are taken into account in the simulations. The shear is not negligible, which implies that the fishbone mode frequency has a radial dependency, impacting the wave-particle resonance condition. Phase space hole and clump structures are observed in both nonlinear regimes, centered around the precessional and passing resonances. These structures remains attached to the resonances as the different mode frequencies chirp up and down. In the nonlinear phase, the transport of individual resonant trapped particles is identified to be linked to mode-particle synchronization. On this basis, a partial mechanism for the nonlinear coupling between particle transport and mode dominant down-chirping is proposed. The overall transport of alpha particles inside out the q = 1 surface is of order 2-5% of the initial population between the simulations. The loss of alpha power is found to be directly equal to the loss of alpha particles.
Comprehensive evaluation of the linear stability of Alfvén eigenmodes driven by alpha particles in an ITER baseline scenario
阿尔文本征模的线性稳定性在聚变产生的α粒子的存在下进行了彻底评估的两个变种的ITER基线方案，这在他们的核心和基座温度显着不同。一个系统的方法，考虑所有可能的本征模为一个给定的磁平衡，并确定其增长率由于α粒子驱动器和朗道阻尼燃料离子，氦灰和电子。这种广泛的稳定性研究是有效地进行，通过使用一个专门的工作流程，从混合MHD漂移动力学代码$\mbox{CASTOR-K}$（Borba D.和Kerner W. 1999 J. Comput.物理学${\bf 153}$ 101; Nabais F. ${\it et\,al}$ 2015血浆科学技术${\bf 17}$ 89），其可以快速评估本征模的线性增长率。结果发现，在上述ITER方案中增长最快的不稳定性是核心本地化，低剪切环形阿尔文本征模。最大的增长率发生在具有较高的核心温度的方案变体中，其具有最高的α粒子密度和密度梯度，对于具有环形模式数$n\approx30$的本征模式。虽然这些本征模遭受显着的辐射阻尼，这也是评估，它们的增长率仍然大于那些最不稳定的本征模中发现的ITER基线方案的变化与较低的核心温度，有$n\approx15$，不受辐射阻尼。
Helical Core Formation and MHD Stability in ITER-Scale Plasmas with Fusion-born Alpha Particles
National Institute for Quantum Science and Technology, Rokkasho Institute for Fusion Energy（量子科学技术研究机构，六所聚变能源研究所）；National Institute for Quantum Science and Technology, Naka Institute for Fusion Science and Technology（量子科学技术研究机构，那波聚变科学与技术研究所）
