Role of phase space structures in collisionless drift wave turbulence and impact on transport modeling
Role of phase space structures in collisionless drift wave turbulence and impact on transport modeling
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相空间结构在无碰撞漂移波湍流中的作用及其对输运模型的影响
DOI：
10.1088/1741-4326/57/7/072006
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. Lesur
中科院分区：
文献类型：
--
作者：
Y. Kosuga ;S.-I. Itoh ;P.H. Diamond ;K. Itoh ;M. Lesur
在聚变等离子体中，加热、波粒相互作用等多种机制会导致分布函数偏离麦克斯韦分布，从而形成相空间结构。本文讨论了漂移波湍流的相空间结构对动力学和输运模型的影响。两种情况下的（i）相干孔和（ii）非相干粒化（集群的相关共振粒子有限的寿命时间）进行处理。通过显式计算非线性增长率，分析了它们对驱动亚临界不稳定性的动力学影响。还讨论了纬向流的作用。它解释了如何相空间结构可以与瞬态事件和非扩散运输，在当前的限制研究的问题。
In fusion plasmas, several mechanisms such as heating, wave-particle interaction etc can drive deviations of distribution function from Maxwelian to form phase space structures. This article discusses the impact of phase space structures in drift wave turbulence on dynamics and transport modeling. The two cases of (i) coherent holes and (ii) incoherent granulations (clusters of correlated resonant particles with finite life time) are treated. Their dynamical impact on driving subcritical instability is analyzed by explicitly calculating the nonlinear growth rate. The role of zonal flows is also addressed. It is explained how phase space structures can be related to transient events and non-diffusive transport, issues in current confinement research.