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arXiv 2202.02722physics.plasm-ph
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旋转圆柱螺旋放电等离子体的离子声不稳定性

The ion acoustic instability of the rotating cylindrical helicon discharge plasma

V. V. Mikhailenko, Hae June Lee, V. S. Mikhailenko

摘要:

考虑圆柱形几何形状以及螺旋波和等离子体的径向不均匀性,建立了由圆柱对称(方位角模数m=0)螺旋波产生的圆柱形等离子体的动力学理论。该理论揭示了由螺旋电场的径向不均匀性引起的具有径向不均匀角速度的电子的方位角稳定旋转的宏观效应。结果表明,这种剪切旋转以及电子密度和温度的不均匀性是导致非均匀圆柱形等离子体高频离子声不稳定性的主要原因。这种不稳定性在空间上局限于螺旋波电场和等离子体密度的强梯度的区域中,其中它比由螺旋波中的电子相对于离子的振荡运动驱动的参数不稳定性更强。

英文摘要:

The kinetic theory for the cylindrical plasma, produced by the cylindrically symmetric (azimuthal mode number m=0) helicon wave, is developed with accounting for the cylindrical geometry and the radial inhomogeneity of the helicon wave and plasma. This theory reveals macroscale effect of the azimuthal steady rotation of electrons with a radially inhomogeneous angular velocity, caused by radial inhomogeneity of the helicon electric field. It is found that this sheared rotation as well as the electron density and temperature inhomogeneity are responsible for the development of the high frequency ion acoustic instability of the inhomogeneous cylindrical plasma. This instability is spatially localized in the region of strong gradients of the helicon wave electric field and of the plasma density, where it is more stronger than the parametric instabilities driven by the oscillating motion of the electrons relative to ions in the helicon wave.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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