Heating of Plasma Ions in a Tokamak by the Second-Harmonic Ion-Cyclotron Resonance Interaction with Radio-Frequency Waves

Hwang, D. Q.; Hosea, J. C.; Thompson, H.R.; Wilson, J. R.; Davis, S.; Herndon, D. L.; Kaita, R.; Mueller, D.; Suckewer, S.; Daughney, C.; Colestock, P.

doi:10.1103/physrevlett.51.1865

Cited by 42 publications

(29 citation statements)

References 4 publications

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“…In PLT, measurements during second harmonic heating of hydrogen showed the characteristic curvature expected for second harmonic heating and agreed with an isotropic quasi-linear theory for reasonable values of absorbed R F power density and perpendicular wave vector [131] (Fig. 26).…”

Section: Icrf Wavessupporting

confidence: 72%

“…26). At higher RF power levels, the spectrum became anisotropic as predicted by theory [131]. In another experiment in PLT, the deuterium spectrum was measured during combined second harmonic heating of deuterium and fundamental heating of a hydrogen minority [134].…”

Section: Icrf Wavesmentioning

confidence: 99%

“…A distorted distribution function during second harmonic heating was first reported on PLT [log, 1311, and was subsequently measured on JFT-2 [98], ASDEX [lo21 and JT-60 [132,1331. The PLT studies employed active and passive charge exchange measurements in both the perpendicular and the parallel directions [131] and 3 MeV proton measurements from the d(d, p)t fusion reaction [57]; the measurements showed that the fast ions were more energetic in the perpendicular direction and were concentrated in the plasma centre. On JT-60, proton energies up to 140 keV have been measured during second harmonic heating [133] (Fig.…”

Section: Ion Cyclotron Range Of Frequenciesmentioning

confidence: 99%

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The behaviour of fast ions in tokamak experiments

1994

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ABSTRACT. Fast ions with energies significantly larger than the bulk ion temperature are used to heat most tokamak plasmas. Fast ion populations created by fusion reactions, by neutral beam injection and by radiofrequency (RF) heating are usually concentrated in the centre of the plasma. The velocity distribution of these fast ion populations is determined primarily by Coulomb scattering; during wave heating, perpendicular acceleration by the RF waves is also important. Transport of fast ions is typically much slower than thermal transport, except during MHD events. Intense fast ion populations drive collective instabilities. Implications for the behaviour of alpha particles in future devices are discussed.

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Section: Icrf Wavessupporting

confidence: 72%

Section: Icrf Wavesmentioning

confidence: 99%

Section: Ion Cyclotron Range Of Frequenciesmentioning

confidence: 99%

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The behaviour of fast ions in tokamak experiments

1994

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“…Second harmonic heating of a hydrogen plasma with P RF at the 1 MW level was successful in increasing the hydrogen effective temperature [T eff = 2/3⟨E⟩] from ~ 0.5 keV to ~ 3 keV (Fig. 9) [13]. This is an important method that can be used in the low-B startup phase of ITER and for the second harmonic T regime in a D-T plasma.…”

Section: Plt Tokamak: Clear Demonstration Of the Minority H Regime Mmentioning

confidence: 99%

Development of slow and fast wave coupling and heating from the C-Stellarator to NSTX

Hosea

2017

EPJ Web Conf.

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Abstract.A historical perspective on key discoveries which contributed to understanding the properties of coupling both slow and fast waves and the effects on plasma heating and current drive will be presented. Important steps made include the demonstration that the Alfven resonance was in fact a mode conversion on the C-stellarator, that toroidal m = -1 eigenmodes were excited in toroidal geometry and impurity influx caused the Z mode on the ST tokamak, that the H minority regime provided strong heating and that 3 He minority could be used as well on PLT, that the 2 nd harmonic majority tritium regime was viable on TFTR, and that high harmonic fast wave heating was efficient when the SOL losses were avoided on NSTX.yyyyyyyyyyyyyyyyyy

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“…[1][2][3][4][5] At the University of California at Los Angeles (UCLA), far-infrared (FIR) collective Thomson scattering has been employed to probe directly and identify the various plasma waves excited. This has served to improve the understanding of ICRF wave physics while also offering potential diagnostic applications.…”

mentioning

confidence: 99%

Observation of Second-Harmonic Ion Bernstein Waves Excited by Fast-Wave Mode Conversion in the Microtor Tokamak

et al. 1984

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This paper reports the first conclusive observation of ion Bernstein waves near the second-harmonic cyclotron layer in a single-ion-species tokamak plasma. The interpretation that the ion Bernstein waves are generated through fast-wave mode conversion at the second-harmonic cyclotron layer is supported by wave dispersion measurements as well as the observation of the long-wavelength fast wave by laser scattering techniques.

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Heating of Plasma Ions in a Tokamak by the Second-Harmonic Ion-Cyclotron Resonance Interaction with Radio-Frequency Waves

Cited by 42 publications

References 4 publications

The behaviour of fast ions in tokamak experiments

The behaviour of fast ions in tokamak experiments

Development of slow and fast wave coupling and heating from the C-Stellarator to NSTX

Observation of Second-Harmonic Ion Bernstein Waves Excited by Fast-Wave Mode Conversion in the Microtor Tokamak

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