The evolution of the radial profile of the rotation of a weakly magnetized plasma column is investigated experimentally in a radio-frequency argon plasma at low pressure when a strong electron current is emitted by large emissive cathodes. Current injection from large emissive cathodes over a background plasma column (with a plasma density of a few $10^{18}\ \textrm {m}^{-3}$ ) is characterized. Radial scans of the ion velocity show that a continuous control of the rotation profile may be obtained using two spatial configurations for the locations of the emissive cathodes (either in the centre or at the edge of the plasma column). The rotation profile results from the electric drift velocity, damped by the drag exerted on the ions. We demonstrate that the evolution of the rotation profile with the injected current is then controlled by the modification of the plasma potential profile in the presence of strongly emissive cathodes.

中文翻译：

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使用发射电极注入电流控制弱磁化等离子体柱的旋转和剪切

当大发射阴极发射强电子电流时，在低压下的射频氩等离子体中实验研究了弱磁化等离子体柱旋转的径向轮廓的演变。在背景等离子体柱上从大型发射阴极注入电流（等离子体密度为几 $10^{18}\ \textrm {m}^{-3}$ ) 的特点。离子速度的径向扫描表明，对于发射阴极的位置（在中心或在等离子体柱的边缘），可以使用两种空间配置来获得对旋转轮廓的连续控制。旋转曲线由电漂移速度产生，由施加在离子上的阻力衰减。我们证明了随着注入电流的旋转曲线的演变，然后通过在强发射阴极存在下改变等离子体电位曲线来控制。