Resonant cavity modes of a bounded helicon discharge

Kyeong Koo Chi; T. E. Sheridan; R. W. Boswell

doi:10.1088/0963-0252/8/3/312

Resonant cavity modes of a bounded helicon discharge

Kyeong Koo Chi, T. E. Sheridan, R. W. Boswell

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79 Citations (Scopus)

Abstract

Five distinct discharge modes are observed in a cylindrically-symmetric helicon reactor. Each mode is characterized by its plasma impedance, wave mode structure, density distribution and floating potential structure. It is shown that the lowest two modes are capacitive (E) and inductive (H), while higher modes are helicon wave (W) modes. Successive wave modes are found to correspond to helicon wave cavity resonances of the plasma-filled vacuum vessel, each with a well defined wavevector, density and impedance. Measured wavevectors and densities are in agreement with the helicon wave dispersion relation. The first helicon discharge mode is found to be an m = ±1 mode, as expected for a double saddle field antenna. Unexpectedly, the second and third helicon modes have an m = 0 azimuthal symmetry.

Original language	English
Pages (from-to)	421-431
Number of pages	11
Journal	Plasma Sources Science and Technology
Volume	8
Issue number	3
DOIs	https://doi.org/10.1088/0963-0252/8/3/312
Publication status	Published - Aug 1999

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title = "Resonant cavity modes of a bounded helicon discharge",

abstract = "Five distinct discharge modes are observed in a cylindrically-symmetric helicon reactor. Each mode is characterized by its plasma impedance, wave mode structure, density distribution and floating potential structure. It is shown that the lowest two modes are capacitive (E) and inductive (H), while higher modes are helicon wave (W) modes. Successive wave modes are found to correspond to helicon wave cavity resonances of the plasma-filled vacuum vessel, each with a well defined wavevector, density and impedance. Measured wavevectors and densities are in agreement with the helicon wave dispersion relation. The first helicon discharge mode is found to be an m = ±1 mode, as expected for a double saddle field antenna. Unexpectedly, the second and third helicon modes have an m = 0 azimuthal symmetry.",

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AU - Sheridan, T. E.

AU - Boswell, R. W.

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N2 - Five distinct discharge modes are observed in a cylindrically-symmetric helicon reactor. Each mode is characterized by its plasma impedance, wave mode structure, density distribution and floating potential structure. It is shown that the lowest two modes are capacitive (E) and inductive (H), while higher modes are helicon wave (W) modes. Successive wave modes are found to correspond to helicon wave cavity resonances of the plasma-filled vacuum vessel, each with a well defined wavevector, density and impedance. Measured wavevectors and densities are in agreement with the helicon wave dispersion relation. The first helicon discharge mode is found to be an m = ±1 mode, as expected for a double saddle field antenna. Unexpectedly, the second and third helicon modes have an m = 0 azimuthal symmetry.

AB - Five distinct discharge modes are observed in a cylindrically-symmetric helicon reactor. Each mode is characterized by its plasma impedance, wave mode structure, density distribution and floating potential structure. It is shown that the lowest two modes are capacitive (E) and inductive (H), while higher modes are helicon wave (W) modes. Successive wave modes are found to correspond to helicon wave cavity resonances of the plasma-filled vacuum vessel, each with a well defined wavevector, density and impedance. Measured wavevectors and densities are in agreement with the helicon wave dispersion relation. The first helicon discharge mode is found to be an m = ±1 mode, as expected for a double saddle field antenna. Unexpectedly, the second and third helicon modes have an m = 0 azimuthal symmetry.

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Resonant cavity modes of a bounded helicon discharge

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