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
复制标题
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
影响因子:
2.2
通讯作者:
中科院分区:
文献类型:
--
作者:
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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影响因子:
8.6
作者:
M. Rosenbluth;F. Hinton
通讯作者:
M. Rosenbluth;F. Hinton
影响因子:
2.2
作者:
M. Malkov;P. Diamond;M. Rosenbluth
通讯作者:
M. Malkov;P. Diamond;M. Rosenbluth
影响因子:
2.6
作者:
B. Scott
通讯作者:
B. Scott
DOI:
10.1002/047168175x.ch12
发表时间:
2005-01
期刊:
--
影响因子:
--
作者:
B. Linder
通讯作者:
B. Linder
影响因子:
2.2
作者:
Conway, GD;Scott, B;Kendl, A
通讯作者:
Kendl, A