Dynamics of turbulent transport dominated by the geodesic acoustic mode near the critical gradient regime

Dynamics of turbulent transport dominated by the geodesic acoustic mode near the critical gradient regime
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临界梯度区域附近的测地声学模式主导的湍流输运动力学

DOI:
10.1063/1.2908742
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发表时间:
2008-05
期刊:
影响因子:
2.2
通讯作者:
--
中科院分区:
物理与天体物理3区
文献类型:
--
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基于全局Landau流体模拟和扩展的捕食者-被捕食者模型分析,研究了测地线声学模(GAMs)对托卡马克等离子体中临界梯度区附近环形离子温度梯度湍流及其输运的影响.一种新型的间歇动力学的运输伴随着发射和传播的GAM,即,GAM不透明度[K.三木等人,物理学评论快报99,145003(2007)]中所描述的。当湍流能量超过临界值时,由空间传播的GAM的开始触发间歇性爆发。GAM在传播过程中受到无碰撞阻尼,并将局部湍流能量非局部地转移到宽径向区域。定常纬向流由于非阻尼剩余部分在多个准周期间歇爆发周期的积累而逐渐增加,并最终淬灭湍流,导致线性临界梯度的非线性上移,即Dimits...
The effects of geodesic acoustic modes (GAMs) on the toroidal ion temperature gradient turbulence and associated transport near the critical gradient regime in tokamak plasma are investigated based on global Landau-fluid simulations and extended predator-prey modeling analyses. A new type of intermittent dynamics of transport accompanied with the emission and propagation of the GAMs, i.e., GAM intermittency [K. Miki et al., Phys. Rev. Lett. 99, 145003 (2007)], has been found. The intermittent bursts are triggered by the onset of spatially propagating GAMs when the turbulent energy exceeds a critical value. The GAMs suffer collisionless damping during the propagation and nonlocally transfer local turbulence energy to wide radial region. The stationary zonal flows gradually increase due to the accumulation of non-damped residual part over many periods of quasi-periodic intermittent bursts and eventually quench the turbulence, leading to a nonlinear upshift of the linear critical gradient; namely, the Dimits...
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