Radio-frequency wave interchange stability experiments below the ion cyclotron frequency

J. J. Browning; N. Hershkowitz; T. Intrator; R. Majeski; S. Meassick

doi:10.1063/1.858948

Radio-frequency wave interchange stability experiments below the ion cyclotron frequency

J. J. Browning, N. Hershkowitz, T. Intrator, R. Majeski, S. Meassick

Electrical Engineering Department

University of Wisconsin

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

It has been demonstrated in the Phaedrus-B tandem mirror [Phys. Fluids 31, 714 (1988)] that radio-frequency (rf) waves applied below the ion cyclotron frequency (ω/Ω_i≈0.75) can stabilize a mirror plasma against the interchange instability. Results presented here demonstrate stabilization over a range of frequencies (0.65<ω/Ω_i/ <0.8) with the ℳ_MHD = - 1 instability stabilized and higher-order (|ℳ_MHD |>2) low-amplitude modes present. Radial profiles of the rf magnetic fields at a number of axial locations as well as parallel wavenumber measurements indicate ℳ_rf = - 1 slow shear Alfvén wave excitation over this frequency range. Measurements at frequencies below 0.75Ω_i, indicate attenuation of rf waves by gas baffles and a gas box.

Original language	English
Pages (from-to)	1692-1701
Number of pages	10
Journal	Physics of Fluids B
Volume	1
Issue number	8
DOIs	https://doi.org/10.1063/1.858948
State	Published - 1989

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title = "Radio-frequency wave interchange stability experiments below the ion cyclotron frequency",

abstract = "It has been demonstrated in the Phaedrus-B tandem mirror [Phys. Fluids 31, 714 (1988)] that radio-frequency (rf) waves applied below the ion cyclotron frequency (ω/Ωi≈0.75) can stabilize a mirror plasma against the interchange instability. Results presented here demonstrate stabilization over a range of frequencies (0.65<ω/Ωi/ <0.8) with the ℳMHD = - 1 instability stabilized and higher-order (|ℳMHD |>2) low-amplitude modes present. Radial profiles of the rf magnetic fields at a number of axial locations as well as parallel wavenumber measurements indicate ℳrf = - 1 slow shear Alfv{\'e}n wave excitation over this frequency range. Measurements at frequencies below 0.75Ωi, indicate attenuation of rf waves by gas baffles and a gas box.",

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T1 - Radio-frequency wave interchange stability experiments below the ion cyclotron frequency

AU - Browning, J. J.

AU - Hershkowitz, N.

AU - Intrator, T.

AU - Majeski, R.

AU - Meassick, S.

PY - 1989

Y1 - 1989

N2 - It has been demonstrated in the Phaedrus-B tandem mirror [Phys. Fluids 31, 714 (1988)] that radio-frequency (rf) waves applied below the ion cyclotron frequency (ω/Ωi≈0.75) can stabilize a mirror plasma against the interchange instability. Results presented here demonstrate stabilization over a range of frequencies (0.65<ω/Ωi/ <0.8) with the ℳMHD = - 1 instability stabilized and higher-order (|ℳMHD |>2) low-amplitude modes present. Radial profiles of the rf magnetic fields at a number of axial locations as well as parallel wavenumber measurements indicate ℳrf = - 1 slow shear Alfvén wave excitation over this frequency range. Measurements at frequencies below 0.75Ωi, indicate attenuation of rf waves by gas baffles and a gas box.

AB - It has been demonstrated in the Phaedrus-B tandem mirror [Phys. Fluids 31, 714 (1988)] that radio-frequency (rf) waves applied below the ion cyclotron frequency (ω/Ωi≈0.75) can stabilize a mirror plasma against the interchange instability. Results presented here demonstrate stabilization over a range of frequencies (0.65<ω/Ωi/ <0.8) with the ℳMHD = - 1 instability stabilized and higher-order (|ℳMHD |>2) low-amplitude modes present. Radial profiles of the rf magnetic fields at a number of axial locations as well as parallel wavenumber measurements indicate ℳrf = - 1 slow shear Alfvén wave excitation over this frequency range. Measurements at frequencies below 0.75Ωi, indicate attenuation of rf waves by gas baffles and a gas box.

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JO - Physics of Fluids B

JF - Physics of Fluids B

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Radio-frequency wave interchange stability experiments below the ion cyclotron frequency

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