Dynamics of zonal flows in helical systems

被引：81

作者：

Sugama, H ^{[1
]}

Watanabe, TH ^{[1
]}

机构：

[1] Grad Univ Adv Studies, Natl Inst Fus Sci, Toki 5095292, Japan

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.94.115001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A theory for describing collisionless long-time behavior of zonal flows in helical systems is presented and its validity is verified by gyrokinetic-Vlasov simulation. It is shown that, under the influence of particles trapped in helical ripples, the response of zonal flows to a given source becomes weaker for lower radial wave numbers and deeper helical ripples while a high-level zonal-flow response, which is not affected by helical-ripple-trapped particles, can be maintained for a longer time by reducing their bounce-averaged radial drift velocity. This implies a possibility that helical configurations optimized for reducing neoclassical ripple transport can simultaneously enhance zonal flows which lower anomalous transport.

引用

页数：4

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