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arXiv physics/0410164physics.plasm-ph
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低磁场中单模螺旋波产生等离子体

Plasma production by helicon waves with single mode number in low magnetic fields

Genta Sato, Wataru Oohara, Rikizo Hatakeyama

摘要:

使用方位角模式数为$|m|$ = 1的三种类型的螺旋波激励天线在低磁场(0-10 mT)中进行射频放电。在相位螺旋天线的情况下,等离子体密度的最明显峰值仅在几mT处产生,其中具有$|m| = 1$的螺旋波纯粹被激发并传播。基于色散关系的分析很好地解释了密度峰现象之间的对应关系天线的一个波长和螺旋波长。$m=+1$螺旋波即使在高磁场中也能传播,在高磁场中没有观察到密度峰,但$m=-1$螺旋波消失。从理论上可以预期,$m=-1$螺旋波在低密度区表现出截止行为,[M. Kramer,Phys. Plasmas 6,1052(1999)],并且实验观察到的$m=-1$螺旋波的截止与计算值一致。

英文摘要:

Radio-frequency discharges are performed in low magnetic fields (0-10 mT) using three types of helicon-wave exciting antennas with the azimuthal mode number of $|m|$ = 1. The most pronounced peak of plasma density is generated in the case of phased helical antenna at only a few mT, where the helicon wave with $|m| = 1$ is purely excited and propagates. An analysis based on the dispersion relation well explains the density-peak phenomenon in terms of the correspondence between the antenna one-wavelength and the helicon wavelength. The $m=+1$ helicon wave propagates even in high magnetic fields where the density peaks are not observed, but the $m=-1$ helicon wave disappers. It is expected theoretically that the $m=-1$ helicon wave shows cutoff behavior in a low density region, [M. Kramer, Phys. Plasmas 6, 1052 (1999)], and the cutoff of $m=-1$ helicon wave experimentally observed coincides with the calculated one.

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