Dependence of the energy lifetime on the type of anomalous losses in stellarators View Full Text


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Article Info

DATE

2008-07

AUTHORS

L. M. Kovrizhnykh

ABSTRACT

A relatively simple model of transport process in stellarators that was proposed earlier by the author on the basis of neoclassical theory makes it possible to determine the density and temperature profiles of the plasma components, the ambipolar electric field profile, and the particle and energy lifetimes from the given device parameters and given particle and energy sources with allowance for anomalous losses. The results of numerical simulations carried out with this model for the L-2M, ATF, CHS, and LHD stellarators over broad ranges of plasma densities and absorbed powers showed that the plasma energy lifetimes in these devices coincide to within factors on the order of two with those found from empirical scalings. A specific model of anomalous losses was chosen for calculations. Results are presented from simulations with a more general form of the anomalous thermal conductivity. Namely, the thermal conductivity is chosen to be Kj(a) ≈ NαTjβB0−γ, where N(r) is the plasma density and Tj(r) is the temperature of the jth plasma component (j = e, i). The parameters α, β, and γ are set equal to α = 1, β = 2, and γ = 1; α = 0.5, β = 2.5, and γ = 1; α = 1.5, β = 2, and γ = 2; α = 1, β = 2.5, and γ = 2; and α = 1.5, β = 2.5, and γ = 2. The simulations have been done for the L-2M and LHD stellarators. It is found that, in all the five models, the calculated energy lifetimes τc are essentially independent of the functional form of the anomalous thermal conductivity and coincide to within a factor on the order of two with those following from the LHD scaling. More... »

PAGES

529-537

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1063780x08070015

DOI

http://dx.doi.org/10.1134/s1063780x08070015

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1021262403


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