Propagation of Ion Cyclotron Harmonic Wave

Ault, E. R.

doi:10.1063/1.1692875

Cited by 26 publications

(4 citation statements)

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“…The propagation domain is larger for NIBW, and there is already experimental observation of these waves, in particular by Ault and Ikezi. 2 Finally, Landau damping due to electrons was observed experimentally by Hirose, Alexeff, and Jones. 6 In the experiment the wave is excited by an antenna of finite length L. Although the antenna is perfectly aligned parallel to the magnetic field, because of the finite geometry it excites a set of modes with wave vector k having small k^ components.…”

mentioning

confidence: 86%

“…We obtained an Ohmic-heating current column isolated from the wall of the vacuum vessel by the separatrix of the Heliotron magnetic field 1 without using a material limiter in the experiment on the Heliotron B. 2 The separatrix region in the helical Heliotron field 1 * 3 ' 4 is also expected to act as a natural limiter, since the outermost closed magnetic surface is located inside the helical conductor without crossing the wall of the vacuum vessel. Similar methods have been proposed to remove the limiter recently.…”

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confidence: 99%

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Dispersion and Cyclotron Damping of Pure Ion Bernstein Waves

Schmitt

1973

Phys. Rev. Lett.

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confidence: 86%

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confidence: 99%

Dispersion and Cyclotron Damping of Pure Ion Bernstein Waves

Schmitt

1973

Phys. Rev. Lett.

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“…The ES ICW dispersion relation exhibits a cut-off behavior (k.L_ 0) as co_ D.i. 5 In a two-ionspecies plasma, the wave exhibits a resonance behavior (k±_ ,,,,) as it approaches the ion-ion hybrid frequency, c.Oih, and the lower hybrid frequency, = _pi, from below. 9…”

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confidence: 99%

Investigation of electrostatic waves in the ion cyclotron range of frequencies in L-4 and ACT-1

Ono¹

1993

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Electrostatic waves in the ion cyclotron range of frequencies (ICRF) were studied in the Princeton L-4 and ACT-I (the Advanced Concept Torus-1) devices for approximately ten years, from 1975 to 1985. The investigation began in the L-4 linear device, looking for the • parametric excita.'ion of electrostatic ion cyclotron waves in multi-ion-species plasmas. In addition, this investigation verified multi-ion-species effects on the electrostatic ion cyclotron wave dispersion relation including the ion-ion hybrid resonance. Finite-Larmor-radius modification of the wave dispersion relation was also observed, even for ion temperatures of , Ti = 1/40 eV (~the room temperature!). Taking advantage of the relatively high field and long device length of L-4, the existence of the cold electrostatic ion cyclotron wave (CES ICW) was verified. This branch occurs below the ion cyclotron frequency and, in a two-ion-lP species plasma, shows a resonance at the ion-ionhybrid frequency. With the arrival of the ACT-1 toroidal device, finite-Larmor-radius (b'LR) waves were studied in a relatively collisionless warm-ion hydrogen plasma. Detailed investigations of ion Bernstein waves (IBW) included the verification of mode-transformation in their launching, their wave propagation characteristics, their absorption, and the resulting ion heating. This basic physics activity played a crucial role in developing a new reactor heating concept termed ion Bernstein wave heating 0BWH).Experimentalresecach in the lower hybrid frequency range confirmed the existence of FLR effects near the lower hybrid resonance, predicted by Stix in 1965. In a neon plasma with a carefully placed phased wave exciter, the neutralized ion Bernstein wave was observed for the f'u'sttime. Using a fastwave ICRF antenna, two parasitic excitation processes for IBW -parametric instabilityand density-gradient-drivenexcitation --were also discoverezLIn the concluding section of this paper, a possible application of externally launched = electrostatic waves is suggested for helium ash removal from fusion reactor plasmas.

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“…Electrostatic ion cyclotron (EIC) waves identified by D'Angelo and Motley 12 have been studied extensively. [13][14][15][16][17][18][19][20][21][22][23] A general background and the history of research on EIC waves can be found 2 in the appropriate literature 24 and recent papers. 25,26 The effect of collisions with neutrals on EIC waves was investigated by Suszcynsky et al 27,28 They showed experimentally that EIC waves could be excited even when the collision frequency and the ion cyclotron frequency are comparable, demonstrating the existence of EIC waves in weakly ionized plasmas in the bottom of the E region in the Earth's ionosphere.…”

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Plasma–neutral coupling allows electrostatic ion cyclotron waves to propagate below ion cyclotron frequency

Terasaka

Yoshimura

2022

Physics of Plasmas

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The effect of ion-neutral collisions on the propagation characteristics of electrostatic ion cyclotron (EIC) waves in a partially ionized plasma is investigated. The dispersion relation of EIC waves is derived using a fluid model taking neutral dynamics into account.The propagation properties of EIC modes, including the damping factor, are examined for various ionization degrees and collision frequencies, which determine the momentum transferred from ions to neutral particles. It is found that the motion of neutral particles driven by plasma-neutral coupling leads to an increase in the effective ion mass, and consequently, EIC waves can propagate even below the ion cyclotron frequency. In a hot neutral gas, the gas-thermal mode can also propagate as well as the EIC mode. The possibility of observing in the laboratory and the Earth's ionosphere is discussed.

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Propagation of Ion Cyclotron Harmonic Wave

Abstract: Low-frequency electrostatic waves which propagate across the magnetic field are studied experimentally. The observed dispersion relation agrees with that of the ion cyclotron harmonic wave. Strong damping of the wave is observed.

Cited by 26 publications

References 4 publications

Dispersion and Cyclotron Damping of Pure Ion Bernstein Waves

Dispersion and Cyclotron Damping of Pure Ion Bernstein Waves

Investigation of electrostatic waves in the ion cyclotron range of frequencies in L-4 and ACT-1

Plasma–neutral coupling allows electrostatic ion cyclotron waves to propagate below ion cyclotron frequency

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