Coupling of a Trivelpiece-Gould wave to a new type of electromagnetic wave observed around the electron cyclotron frequency in an inhomogeneous plasma column

Cabral, J. M. S.

doi:10.1088/0741-3335/31/2/012

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Microwave interferometry is a powerful tool to enable us to obtain a snapshot of the electric and magnetic fields. Mode structures of the waves in plasmas have been investigated with direct observation by using interferometry systems such as lock-in amplifier [11]. The waveform profiles of electric/ magnetic fields give us various characteristics of the wave, i.e.…”

Section: Diagnostic System Of Waves In Plasmasmentioning

confidence: 99%

Direct observation of transition to electron Bernstein waves from electromagnetic mode by three mode-conversion scenarios in the dipole confinement torus plasma

Uchijima

Takemoto

Morikawa

et al. 2015

Plasma Phys. Control. Fusion

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Direct measurement experiments on the mode conversion to the electron Bernstein wave (EBW) have been conducted in dipole confinement torus plasmas for three excitation scenarios; i.e. perpendicular injections of an eXtraordinary mode (X-mode) from the low-and high-magnetic-field sides, and the oblique injection of an Ordinary mode (O-mode) from the low-magnetic-field side. By inserting probe antennas into plasmas, wave propagation has been directly measured. At plasma conditions for the EBW excitation, several characteristics which indicate the mode conversion to the EBWs have been observed; i.e. a short wavelength wave, an electrostatic and longitudinal mode, backward propagation at the upper hybrid resonance (UHR) region. Meanwhile, the wavelengths experimentally observed might be slightly longer than those of theoretical prediction. In the case of the oblique injection of the O-mode, it has been identified that the window of the injection angle for the excitation of the EBW would be quite limited, and the optimum angle seems to be roughly in agreement with theory. These experimental results might support that the electromagnetic waves injected outside of torus plasmas reach to the UHR region and convert wave characteristics to the EBWs for three excitation scenarios.

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Section: Diagnostic System Of Waves In Plasmasmentioning

confidence: 99%

Direct observation of transition to electron Bernstein waves from electromagnetic mode by three mode-conversion scenarios in the dipole confinement torus plasma

Uchijima

Takemoto

Morikawa

et al. 2015

Plasma Phys. Control. Fusion

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Oblique propagation of longitudinal spin-electron acoustic waves under the influence of the Coulomb exchange interaction and the quantum Bohm potential

Andreev

2019

Physics of Plasmas

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Influence of the exchange interaction on the properties of the spin-electron acoustic waves at the oblique propagation of waves relatively to the external magnetic field in the magnetically ordered metals is studied. The spectra of the Langmuir wave and the Trivelpiece-Gould wave are also considered. It is well-known that there are two branches of spectrum of the spin-electron acoustic waves in this regime. Change their properties under influence of the exchange interaction is studied. The quantum Bohm potential is included either. The exchange interaction and quantum Bohm potential gives opposite contributions, but they do not compensate each other since they have different dependence on the wave vector. This competition creates a non-monotonical behavior of the Trivelpiece-Gould wave spectrum. The concavity changes in the monotonic spectra of the Langmuir wave and the SEAWs are found.

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Nonlinear Trivelpiece–Gould waves: Recurrence, harmonic cascade, and sidebands

Cabral¹,

Lapão²,

Mendonça³

1993

Physics of Fluids B: Plasma Physics

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A theoretical and experimental study of Trivelpiece–Gould waves propagating in a magnetized plasma column is presented in this paper. In the experiments, these waves are excited by a radio frequency (rf) source, which also serves to create the plasma. Observation of nonlinear effects includes space and time recurrence effects, a wave spectrum containing a large number (up to 25) harmonics, and low-frequency sidebands. The theoretical model explains the recurrence effects as a consequence of multiple nonlinear interactions between the fundamental wave and its harmonics. A good agreement is found between theory and the experiments.

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Coupling of a Trivelpiece-Gould wave to a new type of electromagnetic wave observed around the electron cyclotron frequency in an inhomogeneous plasma column

Cited by 3 publications

References 17 publications

Direct observation of transition to electron Bernstein waves from electromagnetic mode by three mode-conversion scenarios in the dipole confinement torus plasma

Direct observation of transition to electron Bernstein waves from electromagnetic mode by three mode-conversion scenarios in the dipole confinement torus plasma

Oblique propagation of longitudinal spin-electron acoustic waves under the influence of the Coulomb exchange interaction and the quantum Bohm potential

Nonlinear Trivelpiece–Gould waves: Recurrence, harmonic cascade, and sidebands

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