Applicability of the method of magnetosonic heating for thermonuclear parameters of a plasma in a tokamak

Ivanov, N. V.; Kovan, I. A.

doi:10.1007/bf01120166

Cited by 3 publications

(5 citation statements)

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“…Here, the brackets < > denote integrating over the fluctuation spectrum. According to evaluations of [31a], an expression identical with (23) gives rather good agreement with observations of energy losses in several tokamaks. But more recent considerations based on the study of some concrete instabilities (for example, trapped particle instability dealt with in [ 16a]) result in a decrease of the diffusion coefficient and fail to explain the experimental data.…”

Section: Electrostatic Fluctuationssupporting

confidence: 71%

“…But more recent considerations based on the study of some concrete instabilities (for example, trapped particle instability dealt with in [ 16a]) result in a decrease of the diffusion coefficient and fail to explain the experimental data. In our opinion, in solving this question, one should take into account a full drift turbulence spectrum, S(k r , k x , k h o ) , since the account of fairly small k,, ~ 1/qR can lead to a decrease of r c in formula (23).…”

Section: Electrostatic Fluctuationsmentioning

confidence: 99%

“…The theory of this mechanism of anomalous transport has been developed in the papers by Ohkawa [17], Kadomtsev and Pogutse [18], Rechester and Rosenbluth [19], Krommes et al [20],Carreras et al [21], Swain et al [22], Molvig et al [22a], and by other authors. The available experimental data have made it possible to find the value of the magnetic fluctuations b* on the periphery of tokamaks only (Ivanov et al [23], Zweben and Taylor [24], Hedmann and Gould [25], Barnes and Strachan [26], Sawley et al [26a]). This is the reason why the role of this mechanism is not yet sufficiently clear.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic theory of anomalous transport processes in tokamaks

1987

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Investigation of behavior of fast electrons in toroidal discharges was performed. The kinetic equation, describing evolution of fast particle distribution was derived and analyzed. Semi -analytical solution of the kinetic equation was obtained into suprathermal energy region. External electric field, anomalous transport, nonuniformity of mean magnetic field and collisions was shown to be an important factors, affecting distribution function. The role of ambipolar electric field was established and identified as an essential factor of the process of diffusion of fast electrons. The effect of strong influence of density profile on diffusion of fast particles was clearly demonstrated. Comparison with the experimental data, obtained on ZT -40M device, was carried out. The agreements with the results of these experiments is observed.

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Section: Electrostatic Fluctuationssupporting

confidence: 71%

Section: Electrostatic Fluctuationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetic theory of anomalous transport processes in tokamaks

1987

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“…Injected beam ions have been accelerated by ion cyclotron heating (ICH) at cyclotron harmonics in many tokamaks [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Most measurements of acceleration by ICH have employed neutral particle analysis [18,19], although fusion reaction measurements of neutrons and charged fusion products are also common [19,20]. Differences between the perpendicular and equilibrium stored energy are used to measure the anisotropic fast-ion energy [21].…”

Section: Introductionmentioning

confidence: 99%

Measurements of fast-ion acceleration at cyclotron harmonics using Balmer-alpha spectroscopy

Heidbrink

Luo

Burrell

et al. 2007

Plasma Phys. Control. Fusion

109

196

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Combined neutral beam injection and fast wave heating at the fourth and fifth cyclotron harmonics accelerate fast ions in the DIII-D tokamak. Measurements with a nine-channel fast-ion D-alpha (FIDA) diagnostic indicate the formation of a fast-ion tail above the injection energy. Tail formation correlates with enhancement of the d-d neutron rate above the value that is expected in the absence of fast-wave acceleration. FIDA spatial profiles and fast-ion pressure profiles inferred from the equilibrium both indicate that the acceleration is near the magnetic axis for a centrally located resonance layer. The enhancement is largest 8-10 cm beyond the radius where the wave frequency equals the cyclotron harmonic, probably due to a combination of Doppler-shift and orbital effects. The fast-ion distribution function calculated by the CQL3D FokkerPlanck code is fairly consistent with the data.

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“…However, a Balmer-alpha diagnostic can only make a species mix measurement of neutral hydrogen, which is generally concentrated at the plasma boundary; interior activity goes undetected. Another method detects neutral particles that undergo charge exchange reactions in the plasma and escape to a mass-resolving neutralparticle analyser [3,4]. Although neutrals are rare in the core of a hot plasma, injection of a modulated neutral beam can enhance the signal that originates in the core [5].…”

Section: Introductionmentioning

confidence: 99%

Plasma species mix diagnostic using ion–ion hybrid layer reflectometry

Watson¹,

Heidbrink²,

Burrell³

et al. 2004

Plasma Phys. Control. Fusion

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A superheterodyne reflectometer could provide a direct and inexpensive measurement of ion species mixes with different charge-to-mass ratios. Using the cold plasma dispersion relation, the ion-ion hybrid cutoff frequency is uniquely determined by the density ratio and cyclotron frequencies of the two different species. The phase of a 20 MHz wave that travels from the launching point to the cutoff layer to the receiving antenna provides a direct measure of the hydrogen : deuterium species mix. In the first experiment, a fast Alfvén wave is launched perpendicular to a hydrogen-deuterium plasma from the low field side of the DIII-D tokamak. Quantitative measurements observe a hydrogen concentration range of 3-67% and a maximum penetration depth of 0.60 m. Corroborative values are obtained from two independent diagnostics. In the second experiment, the fast Alfvén wave is launched from the high field side (HFS) during a hydrogen puffing experiment. The results suggest that a wave launched from the HFS is able to tunnel through the resonance layer and reflect back to the receiving antenna.

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Applicability of the method of magnetosonic heating for thermonuclear parameters of a plasma in a tokamak

Cited by 3 publications

References 0 publications

Kinetic theory of anomalous transport processes in tokamaks

Kinetic theory of anomalous transport processes in tokamaks

Measurements of fast-ion acceleration at cyclotron harmonics using Balmer-alpha spectroscopy

Plasma species mix diagnostic using ion–ion hybrid layer reflectometry

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