Icr Plasma Heating in L-2 Stellarator

Batyuk, V.A.; Grebenshchikov, S. E.; Meshcheryakov, A. I.; Moroz, Paul; Sukhodol'sky, V.N.; Sbitnikova, I.S.; Shpigel, I.S.; Kovan, I. A.

doi:10.1016/b978-1-4832-8428-6.50035-7

Cited by 2 publications

(5 citation statements)

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“…by the formula nj = nf D n?-n? L nf rPL (5) which in the corresponding limiting cases (in respect of collision frequency) coincide with expressions (3) and ( 2), respectively. In a similar way, we can write the particle fluxes S?…”

Section: Approximate Formulae For Particle and Energy Fluxessupporting

confidence: 73%

“…4 For the ions, the contribution from superbanana transport (IT? 5 ) is very substantial and becomes decisive as the resonance temperature T R is approached; for the electrons it is decisive from 200 eV and in the temperature interval from 500 to 700 eV exceeds the contribution from banana diffusion (i.e. from Hi) by one to two orders of magnitude.…”

Section: Fig5 Energy Confinement Time As a Function Of Temperature Fo...mentioning

confidence: 99%

“…components of the plasma, T ei = (2(m e /mj)>/2 i^)" 1 , as a function of temperature. Curves 1 correspond to the case of an isothermal plasma with 77 = T e /Tj = 1 and a central density Nj(0) = 2 X 10 13 cm" 3 produced in ion cyclotron heating experiments [5], curves 2 to the case of a non-isothermal plasma with 77 = 4 and density Nj(0) = 10 13 cm" 3 produced by Ohmic heating [4]. In the first case (curves 1) there is a resonance point corresponding to a temperature Tj(O) = T R = 1.18 keV at which the ambipolar electric field E a vanishes and then (when Tj(O) > T R ) abruptly changes sign and becomes positive; correspondingly, at the transition through T R the confinement times also change abruptly.…”

Section: Fig5 Energy Confinement Time As a Function Of Temperature Fo...mentioning

confidence: 99%

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The energy confinement time in stellarators

Коврижных

1984

Nucl. Fusion

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On the basis of neoclassical transport theory, approximate expressions are proposed for particle and energy fluxes which can be applied over the whole range of collision frequencies of interest for current experimental work and which allow for the contributions of both transit particles and toroidally and locally trapped particles. With the help of these expressions, an evaluation is made of the electron and ion energy confinement times for a number of stellarators (L-2, W-VIIA, Heliotron-E), and it is shown that the calculated confinement times coincide to within an order of magnitude with the experimentally determined values and do not as a rule require the introduction of additional anomalously high losses via the electron channel. Confinement times are calculated for two stellarators still at the design stage (ATF-1 and L-3) and also for a stellarator thermonuclear reactor. It is shown that, in the case of the reactor, the system would not have to be made unreasonably large in order to satisfy the Lawson criterion (N(0)τE> 1014).

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Section: Approximate Formulae For Particle and Energy Fluxessupporting

confidence: 73%

Section: Fig5 Energy Confinement Time As a Function Of Temperature Fo...mentioning

confidence: 99%

Section: Fig5 Energy Confinement Time As a Function Of Temperature Fo...mentioning

confidence: 99%

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The energy confinement time in stellarators

Коврижных

1984

Nucl. Fusion

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“…than in the case of hydrogen minority heating [28]. Application of ICR heating did not result in additional anomalous losses as compared with Ohmic heating alone.…”

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confidence: 71%

“…The heating efficiency obtained was approximately 2 eV'kW" 1 per 10 13 cm" 3 fora deuterium plasma with hydrogen as a minority species. In these experiments, non-Maxwellian tails were detected in the deuterium energy distributions which indicates direct heating of deuterium at the second harmonic of the ion cyclotron frequency [27].…”

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confidence: 77%