Nonlinear dynamics of transport barrier relaxations in tokamak edge plasmas.
Nonlinear dynamics of transport barrier relaxations in tokamak edge plasmas.
复制标题
托卡马克边缘等离子体中输运势垒弛豫的非线性动力学。
DOI：
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发表时间：
2005
影响因子：
8.6
通讯作者：
Y. Sarazin
中科院分区：
文献类型：
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作者：
P. Beyer;S. Benkadda;G. Fuhr;X. Garbet;P. Ghendrih;Y. Sarazin
利用三维流体湍流模拟，发现了输运势垒间歇性弛豫的一种新机制。这种机制是通用的，因为它只需要一个固定的E x B剪切流。在这里，它被发现，如果流动剪切增加快于线性与加热功率，松弛频率随功率下降。分析研究表明，这种非线性动力学是由有效的速度剪切稳定的时间延迟。
A new mechanism for intermittent relaxations of transport barriers is found by using three dimensional fluid turbulence simulations. This mechanism is generic since it only requires a stationary E x B shear flow. It is found here that if the flow shear increases faster than linearly with heating power, the relaxation frequency decreases with power. An analytical study reveals that this nonlinear dynamics is governed by a time delay for effective velocity shear stabilization.