Integrated tokamak modelling with the fast-ion Fokker-Planck solver adapted for transient analyses
Integrated tokamak modelling with the fast-ion Fokker-Planck solver adapted for transient analyses
复制标题
集成托卡马克建模与适用于瞬态分析的快离子 Fokker-Planck 求解器
DOI：
10.1088/0741-3335/57/9/095007
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M Honda and S Ide
中科院分区：
文献类型：
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作者：
M Toma;K Hamamatsu;N Hayashi;M Honda and S Ide
集成的托卡马克模型能够模拟整个放电周期，这对于设计先进的托卡马克等离子体是必不可少的。为此，我们扩展了集成的代码主题，使其更适合快速部分的瞬态分析。快速离子的福克-普朗克求解器与体输运求解器集成到TOPICS中，使快速离子和体等离子体的时间演化相互一致，并与平衡磁场一致。快速离子溶解器同时处理中性束注入离子和α粒子。由于相空间的降维，快速离子求解器的并行化以及其计算轻量化使长时间的瞬态分析能够在几十秒的顺序中进行。比较了快离子的福克-普朗克计算，并证实了与蒙特卡罗计算后的轨道很好地吻合。将集成代码应用于JT-60SA和ITER的爬坡模拟，验证了其在瞬态分析中的能力和有效性。在综合模拟中，给出了快速离子、等离子体分布和平衡磁场的耦合演化。此外，还讨论了对快离子的电加速效应。
Integrated tokamak modelling that enables the simulation of an entire discharge period is indispensable for designing advanced tokamak plasmas. For this purpose, we extend the integrated code TOPICS to make it more suitable for transient analyses in the fast-ion part. The fast-ion Fokker–Planck solver is integrated into TOPICS at the same level as the bulk transport solver so that the time evolutions of the fast ion and the bulk plasma are consistent with each other as well as with the equilibrium magnetic field. The fast-ion solver simultaneously handles neutral beam-injected ions and alpha particles. Parallelisation of the fast-ion solver in addition to its computational lightness owing to a dimensional reduction in the phase space enables transient analyses for long periods in the order of tens of seconds. The fast-ion Fokker–Planck calculation is compared and confirmed to be in good agreement with an orbit following a Monte Carlo calculation. The integrated code is applied to ramp-up simulations for JT-60SA and ITER to confirm its capability and effectiveness in transient analyses. In the integrated simulations, the coupled evolution of the fast ions, plasma profiles, and equilibrium magnetic fields are presented. In addition, the electric acceleration effect on fast ions is shown and discussed.