Observation of an Upper-Hybrid Soliton

Cho, Teruji; Tanaka, Shigetoshi

doi:10.1103/physrevlett.45.1403

Cited by 28 publications

(27 citation statements)

References 16 publications

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“…In the electron cyclotron frequency regime, PDI was observed around the upper hybrid resonance 64 . Upper hybrid soliton can also form around the resonance 65,66 , which may have implications for the mode conversion physics. Therefore, it is not obvious that the linear theory should be valid for all our results, and larger deviation from the linear theory at higher wave intensity observed here may be an indication of nonlinear wave physics being involved in the pertinent mode conversion process.…”

Section: Wave Intensity Dependencementioning

confidence: 99%

Measurements of ion cyclotron range of frequencies mode converted wave intensity with phase contrast imaging in Alcator C-Mod and comparison with full-wave simulations

et al. 2012

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Radio frequency waves in the ion cyclotron range of frequencies (ICRF) are widely used to heat tokamak plasmas. In ICRF heating schemes involving multiple ion species, the launched fast waves convert to ion cyclotron waves or ion Bernstein waves at the two-ion hybrid resonances. Mode converted waves are of interest as actuators to optimise plasma performance through current drive and flow drive. In order to describe these processes accurately in a realistic tokamak geometry, numerical simulations are essential, and it is important that these codes be validated against experiment. In this study, the mode converted waves were measured using a phase contrast imaging technique in D-H and D-3 He plasmas. The measured mode converted wave intensity in the D-3 He mode conversion regime was found to be a factor of ∼50 weaker than the full-wave predictions. The discrepancy was reduced in the hydrogen minority heating regime, where mode conversion is weaker.a)

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Section: Wave Intensity Dependencementioning

confidence: 99%

Measurements of ion cyclotron range of frequencies mode converted wave intensity with phase contrast imaging in Alcator C-Mod and comparison with full-wave simulations

et al. 2012

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“…Besides, the EUH waves can be modulated by non-resonant density and magnetic field perturbations due to the ponderomotive force effect. The resulting modulational instabilities can be the cause of density and magnetic field profile modifications [6,10], as well as responsible for the formation of envelope EUH solitons [2,3,[10][11][12] and EUH wave collapse [13][14][15][16] Some of these nonlinear effects have been observed both in laboratory and numerical experiments [13,[17][18][19][20] A critical review of solitons and nonlinear waves in magnetized plasmas has been presented by Pécseli [10]. Observations by instruments on board CLUSTER spacecraft reveal the signature fast magnetosonic waves [22] as well as of slow magnetosonic solitons [23].…”

Section: Introductionmentioning

confidence: 99%

Analytical and simulation studies of nonlinear effects caused by upper-hybrid waves in plasmas

Eliasson

Shukła

2003

Physics of Plasmas

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Nonlinear interactions between large amplitude upper-hybrid waves and low-frequency electromagnetic waves in a magnetized plasma have been considered. Specifically, the decay of upper-hybrid waves into lower-hybrid and magnetosonic waves, as well as the modulational instabilities leading to the formation of density cavities which trap upper-hybrid wave envelopes, are investigated both theoretically and numerically. It is found that the three-wave process between two upper-hybrid waves and the lower-hybrid wave, which is the fastest growing instability of the system, is important for the generation of waves of small wave numbers, via the self-interaction of the generated decay products from the three-wave interaction. A comparison between the theory of the parametric decay, simulations of a generalized Zakharov system of equations modeling the interaction between upper-hybrid, lower-hybrid and magnetosonic (fast Alfvénic) waves is presented. Comparisons are made with a simulation of the fully electromagnetic Vlasov–Maxwell system for ions and electrons where a sudden onset of cavities and long wavelength magnetosonic wave emission could be seen, similar as in the simulation of the Zakharov-type system

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“…Specifically, it has been shown that the ponderomotive force of uh waves can excite a variety of parametric instabilities, including decay and modulational interactions. 2,11 It is a widely held view that the long term evolution of modulational instabilities can be responsible for uh envelope solitons 1-4 and uh wave collapses, 5,9 which have been observed in laboratory 6,8 and space environments.…”

mentioning

confidence: 99%

“…© 2003 American Institute of Physics. ͓DOI: 10.1063/1.1615241͔ Several authors [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] have studied the nonlinear interactions between upper-hybrid ͑uh͒ waves and low-frequency electrostatic and electromagnetic waves in an electron-ion plasma. Specifically, it has been shown that the ponderomotive force of uh waves can excite a variety of parametric instabilities, including decay and modulational interactions.…”

mentioning

confidence: 99%

Dynamics of nonlinearly coupled upper-hybrid waves and modified Alfvén modes in a magnetized dusty plasma

Shukła

Stenflo

2003

Physics of Plasmas

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The nonlinear interaction between a large amplitude electrostatic upper-hybrid (uh) wave and Rao’s modified Alfvén mode in a uniform dusty magnetoplasma is considered. The wave equation for the uh wave envelope in a background of electron density and compressional magnetic field perturbations due to the Alfvén mode is presented, and an equation for the latter in the presence of the uh wave ponderomotive force is derived. A nonlinearly coupled uh wave and driven Rao’s modified Alfvén mode equations are then used to investigate the parametric instabilities of a constant amplitude uh pump wave, and the formation of spiky uh wave solitons. The relevance of our investigation to space plasmas is discussed.

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Observation of an Upper-Hybrid Soliton

Cited by 28 publications

References 16 publications

Measurements of ion cyclotron range of frequencies mode converted wave intensity with phase contrast imaging in Alcator C-Mod and comparison with full-wave simulations

Measurements of ion cyclotron range of frequencies mode converted wave intensity with phase contrast imaging in Alcator C-Mod and comparison with full-wave simulations

Analytical and simulation studies of nonlinear effects caused by upper-hybrid waves in plasmas

Dynamics of nonlinearly coupled upper-hybrid waves and modified Alfvén modes in a magnetized dusty plasma

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