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- W1967886386 abstract "We investigated characteristics of a density peak observed in a magnetic field B0 lower than 100 G in the case of using helicon plasma sources with particular wavelength. For B0 > 30 G, the antenna launches an electromagnetic wave as a slow wave, the phase velocity of which becomes close to the electron thermal velocity under the density-peak condition for various gas pressures. The Landau damping frequency is higher than the electron–neutral and the electron–ion collision frequencies, which indicates that the wave produces the plasma via Landau damping at low B0. The wavelengths estimated from the density ne and B0 for the density peaks agree with those of the electromagnetic field generated by helicon antennas of various lengths. The measured density is found to vary under the condition of the agreement between wavelengths of the propagating wave and the antenna-excited field during the density increase. One of the causes of the density peak appearing as a function of B0 is considered to be the wavelength variation and the corresponding change of phase velocity of the slow wave which is enabled to propagate in the plasma by the introduction of B0." @default.
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- W1967886386 date "2007-09-03" @default.
- W1967886386 modified "2023-10-16" @default.
- W1967886386 title "Experimental characterization of a density peak at low magnetic fields in a helicon plasma source" @default.
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- W1967886386 doi "https://doi.org/10.1088/0963-0252/16/4/007" @default.
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