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Observation of turbulent-driven shear flow in a cylindrical laboratory plasma device

机译:圆柱形实验室等离子设备中湍流驱动的剪切流的观测

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A turbulent-generated azimuthally symmetric radially sheared plasma fluid flow is observed in a cylindrical magnetized helicon plasma device with no external sources of momentum input. A turbulent momentum conservation analysis shows that this shear flow is sustained against dissipation by the turbulent Reynolds stress generated by collisional drift fluctuations in the device. In the wavenumber domain this process is manifested via a nonlinear transfer of energy from small scales to larger scales. Simulations of collisional drift turbulence in this device have also been carried out and clearly show the formation of a shear flow quantitatively similar to that observed experimentally. The results integrate experiment and first-principle simulations and validate the basic theoretical picture of drift-wave/shear flow interactions.
机译:在没有外部动量输入源的圆柱形磁化螺旋等离子体设备中,观察到湍流产生的方位角对称的径向剪切等离子体流体流。湍流动量守恒分析表明,该剪切流通过装置中碰撞漂移波动产生的湍流雷诺应力而得以抵抗耗散。在波数域中,该过程通过能量从小尺度到大尺度的非线性传递而得以体现。还已经对该装置中的碰撞漂移湍流进行了模拟,并且清楚地显示了与实验观察到的定量相似的剪切流的形成。结果将实验和第一性原理模拟相结合,并验证了漂移波/剪切流相互作用的基本理论图。

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