Dynamic plasma behaviour excited by m=+or-1 helicon wave

Shinohara, Shunjiro; Miyauchi, Yoko; Kawai, Yoshinobu

doi:10.1088/0741-3335/37/9/007

Cited by 62 publications

(67 citation statements)

References 10 publications

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“…[15][16][17] As described in Sec. II, guided helicon waves have a nonvanishing wavenumber k Ќ perpendicular to the external magnetic field B 0 due to the transverse boundary conditions.…”

Section: A Helicon Wave Field and Helicon Dispersionmentioning

confidence: 99%

Helicon mode formation and radio frequency power deposition in a helicon-produced plasma

Niemi

Krämer

2008

Physics of Plasmas

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Time- and space-resolved magnetic (B-dot) probe measurements in combination with measurements of the plasma parameters were carried out to investigate the relationship between the formation and propagation of helicon modes and the radio frequency (rf) power deposition in the core of a helicon plasma. The Poynting flux and the absorbed power density are deduced from the measured rf magnetic field distribution in amplitude and phase. Special attention is devoted to the helicon absorption under linear and nonlinear conditions. The present investigations are attached to recent observations in which the nonlinear nature of the helicon wave absorption has been demonstrated by showing that the strong absorption of helicon waves is correlated with parametric excitation of electrostatic fluctuations.

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“…[15][16][17] As described in Sec. II, guided helicon waves have a nonvanishing wavenumber k Ќ perpendicular to the external magnetic field B 0 due to the transverse boundary conditions.…”

Section: A Helicon Wave Field and Helicon Dispersionmentioning

confidence: 99%

Helicon mode formation and radio frequency power deposition in a helicon-produced plasma

Niemi

Krämer

2008

Physics of Plasmas

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“…Thus, according to equation (5), relative variations between loading measurements due to changes in the self-resonance are expected to be insignificant. The absolute value of the loading measurements have uncertainties of up to 15%, mainly due to the uncertainty in the estimates of ω a , but relative uncertainties for measurements made with the same antenna are expected to be somewhat less than this value.…”

Section: Loading Measurementsmentioning

confidence: 99%

Helicon wave excitation with rotating antenna fields

Miljak

Chen

1998

Plasma Sources Sci. Technol.

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By using phased bifilar antennas, helicon waves have been excited by applying fields which rotate either in space or in time, or both simultaneously. The direction of rotation is made to favor either m = +1 or m = -1 waves, where m is the azimuthal mode number, and m is measured directly. Rotation in time is found to be more effective than rotation in space and makes possible a direct comparison of m = ±1 excitation. An m = -1 structure was seen only in the antenna near-field, while m = +1 modes propagate far downstream. Up to 2 kW of RF power, density profiles and antenna loading measurements show that m < 0 (left-hand) waves are poorly coupled, and m = +1 (right-hand) waves are necessary for good plasma production. Loading results indicate that antennas also couple to absorption mechanisms unrelated to helicon waves.

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“…Helicon discharge is known as a method which easily produces high density plasma with relatively low input power [10][11][12][13][14]. It has also been mentioned that the helicon plasma achieves a high ionization degree, which is an advantage for the target plasma of the beam-metastable population measurement.…”

Section: -3mentioning

confidence: 99%

“…Although many methods are available for the production of high density plasmas, the structure of electrode or antenna is limited so that the neutral beam can penetrate through the high density plasma. Helicon discharge using a cylindrically or axially winded antenna [10][11][12][13][14] is a candidate of the plasma production, which produces high density plasma and enables the beam to pass through the plasma.…”

Section: Introductionmentioning

confidence: 99%

Development of a Helicon Plasma Source for the Measurement of He* Component in a He0 Beam

Okamoto

Iwazaki

Isono

et al. 2008

Plasma and Fusion Research

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A high density plasma source using helicon discharge was designed for the measurement of the population ratio of the metastable state and ground state in a helium neutral beam. The required density of the plasma source was investigated in terms of the rate coefficient relevant to the beam-plasma interaction. The charge-exchange for the metastable state is a dominant process in a beam-energy range of 30-300 keV for the beam attenuation, promising the measurement of the metastable fraction in the helium neutral beam using this plasma source. The first plasma with the electron density of 3.4 × 10 12 cm −3 and the electron temperature of 10 eV was successfully produced in argon gas.

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Dynamic plasma behaviour excited by m=+or-1 helicon wave

Cited by 62 publications

References 10 publications

Helicon mode formation and radio frequency power deposition in a helicon-produced plasma

Helicon mode formation and radio frequency power deposition in a helicon-produced plasma

Helicon wave excitation with rotating antenna fields

Development of a Helicon Plasma Source for the Measurement of He* Component in a He0 Beam

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