Characterization of Plasma Production by $m=0$ Standing Helicon Waves

概要

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Excitation of $m=0$ standing helicon waves (SHWs) of $N=1$ and 3 modes ($m$ is the azimuthal mode number and $N$ is the number of half-wavelengths in the axial direction) and production of high-density plasmas of the order of $n_{\text{p}}\simeq 10^{13}$ cm3 have been investigated in a short cylindrical plasma column of 10 cm length [M. Nisoa, Y. Sakawa and T. Shoji: Jpn. J. Appl. Phys. 38 (1999) L777]. Excitation of different $N$ modes of SHWs has caused an abrupt density jump with rf power $P_{\text{rf}}$ and axial static magnetic field $B_{0}$. The power-balance equation is solved using the $n_{\text{p}}$ dependence of plasma loading resistance $R$ obtained numerically from a two-dimensional wave code. Calculated $P_{\text{rf}}$ and $B_{0}$ dependence of stable $n_{\text{p}}$ agrees well with measured ones. Measured hollow (parabolic) $n_{\text{p}}$ profile caused by the excitation of $N=1$ ($N=3$, 5 and travelling helicon wave) mode is explained in terms of the perpendicular (parallel) component of wave electric field $E_{\bot}$ ($E_{z}$). Power absorption due to $E_{\bot}$ and $E_{z}$ is dominant for the hollow and parabolic $n_{\text{p}}$ profiles, respectively.
2001-05-15