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in subjects: "Thermonuclear Devices 700105* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Theoretical-- -1987"  
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Preliminary semiempirical transport models

Description: A class of semiempirical transport models is proposed for testing against confinement data from tokamaks and for use in operations planning and machine design. A reference model is proposed to be compatible with published confinement data. Theoretical considerations are used to express the anomalous transport coefficients in terms of appropriate dimensionless parameters.
Date: November 1, 1983
Creator: Singer, C.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Numerical model for radial transport in the ELMO Bumpy Torus

Description: Neutral and charged particle densities and temperatures are calculated as functions of radius for the toroidal plasma in the ELMO Bumpy Torus (EBT) experiment. Energy dependent ionization and charge-exchange rates, ambipolar diffusion, and self-consistent radial electric field profiles are included. Variation in magnetic field due to finite plasma pressure, effects of energetic electron rings, and transport due to drift waves and magnetic field errors are neglected. Diffusion is assumed to be n… more
Date: November 1, 1977
Creator: Jaeger, E. F. & Hedrick, C. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Transport of molecular impurities at the edge of tokamaks

Description: The transport of molecules at the plasma edge in tokamaks is discussed in order to compare how light impurities enter the plasma if they are released either in atomic or molecular forms. Differences in their transport arise because of the dissimilarities between the atomic and molecular reactions with the bulk of the plasma. It is found that recycling to the walls is more efficient for the light impurities released in molecular form, but, also, that a substantial fraction of those atoms which o… more
Date: November 1, 1981
Creator: Langer, W. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comments on ''theory of dissipative density-gradient-driven turbulence in the tokamak edge'' (Phys. Fluids 28, 1419 (1985))

Description: The author critiques the model of tokamak edge turbulence by P.W. Terry and P.H. Diamond (Phys. Fluids 28, 1419, 1985). The critique includes a discussion of the physical basis, consistency and quantitative accuracy of the Terry-Diamond model. 19 refs. (WRF)
Date: November 1, 1985
Creator: Krommes, John A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fluctuations and transport in an inhomogeneous plasma

Description: A formalism is developed for calculating the equilibrium fluctuation level in an inhomogeneous plasma. This formalism is applied to the collisionless drift wave in a sheared magnetic field. The fluctuation level is found to be anomalously large due to both the presence of weakly damped normal modes and convective amplification. As the magnetic shear is reduced, the steady-state fluctuation spectrum is found to increase both in coherence and in amplitude. The transport associated with this mode … more
Date: November 1, 1979
Creator: Nevins, W. M. & Chen, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Particle stochasticity due to magnetic perturbations of axisymmetric geometries

Description: The quasilinear theory of collisionless test particle diffusion in stochastic magnetic fields is extended to include the effects of finite gyroradius rho and particle drifts (including magnetic trapping). A canonical framework is used, in which both the criterion for onset of stochasticity and the diffusion tensor scale with field-particle coupling coefficients g/sub l/. The g/sub l/ contain all the information about a given particle's unperturbed orbit and the perturbation fields with which it… more
Date: November 1, 1979
Creator: Mynick, H.E. & Krommes, J.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Use of the stellarator expansion to investigate plasma equilibrium in modular stellarators

Description: A numerical code utilizing a large-aspect ratio, small-helical-distortion expansion is developed and used to investigate the effect of plasma currents on stellarator equilibrium. Application to modular stellarator configurations shows that a large rotational transform, and hence large coil deformation, is needed to achieve high-beta equilibria.
Date: November 1, 1982
Creator: Anania, G.; Johnson, J. L. & Weimer, K. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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