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Turbulence and transport suppression scaling with flow shear on the Large Plasma Device

机译:大型等离子设备上带有流动剪切的湍流和输运抑制结垢

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摘要

Continuous control over azimuthal flow and shear in the edge of the Large Plasma Device (LAPD) [W. Gekelman, Rev. Sci. Instr. 62, 2875 (1991)] has been achieved using a biasable limiter. This flow control has allowed a careful study of the effect of flow shear on pressure-gradient-driven turbulence and particle transport in LAPD. The combination of externally controllable shear in a turbulent plasma along with the detailed spatial diagnostic capabilities on LAPD makes the experiment a useful testbed for validation of shear suppression models. Motivated by these models, power-law fits are made to the density and radial velocity fluctuation amplitudes, particle flux, density-potential crossphase, and radial correlation length. The data show a break in the trend of these quantities when the shearing rate (γ s = ? V θ / ? r) is comparable to the turbulent decorrelation rate (1 / τ ac). No one model captures the trends in the all turbulent quantities for all values of the shearing rate, but some models successfully match the trend in either the weak (γ s τ ac < 1) or strong (γ s τ ac > 1) shear limits.
机译:连续控制大型等离子设备(LAPD)边缘中的方位角流动和剪切[W. Gekelman,牧师指令62,2875(1991)]已使用可偏置的限制器实现。这种流量控制允许仔细研究流量剪切对LAPD中压力梯度驱动的湍流和颗粒传输的影响。湍流等离子体中外部可控制的剪切力与LAPD上详细的空间诊断功能相结合,使该实验成为验证剪切力抑制模型的有用测试平台。通过这些模型,可以对密度和径向速度波动幅度,粒子通量,密度-势相和径向相关长度进行幂律拟合。数据显示,当剪切速率(γs =?Vθ/?r)与湍流去相关率(1 /τac)可比时,这些量的趋势出现了变化。没有一个模型能够捕获所有剪切速率值的所有湍流量的趋势,但是有些模型可以成功地匹配弱(γsτac <1)或强(γsτac> 1)剪切极限下的趋势。 。

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