TITLE

On the statistical mechanics of self-organized profiles

AUTHOR(S)
Medvedev, M.V.; Diamond, P.H.
PUB. DATE
October 1996
SOURCE
Physics of Plasmas;Oct96, Vol. 3 Issue 10, p3745
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Analyzes the radial structure of tokamak profiles determined by anomalous transport elucidated by studying the statistical mechanics of a sand pile automation for which the toppling conditions depend on local gradient. Markovian nature of the sand pile dynamics; Spatial profiles obtained from calculated expectation values of the local gradient; Local gradient probability distribution function.
ACCESSION #
4257539

 

Related Articles

  • Transport properties of the interacting magnetic-island model of tokamak plasmas. Gianakon, T.A.; Callen, J.D.; Hegna, C.C. // Physics of Plasmas;Jul94, Vol. 1 Issue 7, p2245 

    Explores the equilibrium and transient transport properties of a mixed magnetic topology model for tokamak equilibria. Composition of magnetic topology; Nonlinear dependence of the heat flux on the pressure gradient; Exhibition of a heat pulse diffusion coefficient larger than the power balance...

  • The impact of a biasing radial electric field on the scrape-off layer in a divertor tokamak. Rozhansky, V.; Tendler, M. // Physics of Plasmas;Aug94, Vol. 1 Issue 8, p2711 

    Addresses the issue of transport on open field lines using a fluid approach invoking anomalous inertia and viscosity. Emphasis of the model on transport of the toroidal momentum; Benefits of tokamaks with divertors from an amplification of the electric field; Phenomena resulting from the...

  • Predictive transport simulations of internal transport barriers using the Multi-Mode model. Zhu, P.; Bateman, G.; Kritz, A. H.; Horton, W. // Physics of Plasmas;Jul2000, Vol. 7 Issue 7 

    The formation of internal transport barriers observed in both Joint European Torus (JET) [P. H. Rebut, R. J. Bickerton, and B. E. Keen, Nucl. Fusion 25, 1011 (1985)] and Doublet III-D Tokamak (DIII-D) [J. L. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)] are reproduced in predictive...

  • Spontaneous edge transport barrier formation due to suppression of edge thermal instabilities as a low–high trigger mechanism in tokamaks. Stacey, Weston M. // Physics of Plasmas;Jul2002, Vol. 9 Issue 7, p3082 

    Models for the calculation of edge temperature gradients, of growth rates of edge thermal instabilities, and of the enhancement of edge transport coefficients due to thermal instability growth rates have been coupled. The composite model predicts the existence of threshold values of the edge...

  • Neoclassical transport coefficients for finite-aspect-ratio and bean-shaped tokamak plasmas. Crume, E. C.; Beasley, C. O.; Hirshman, S. P.; van Rij, W. I. // Physics of Fluids (00319171);Apr87, Vol. 30 Issue 4, p1152 

    Numerically calculated tokamak equilibria are used to compute banana-plateau transport coefficients for finite-aspect-ratio, finite-beta plasmas. Calculations are presented for the Spherical Torus Experiment (STX) (NTIS Document No. DE 86004663) and the Princeton Beta Experiment (PBX) (NTIS...

  • Formation of core transport barriers by parallel flow. Sen, S. // Physics of Plasmas;Apr98, Vol. 5 Issue 4, p1000 

    Demonstrates the formation of the tokamak core transport barriers by parallel flow. Stabilization of the drift-ballooning modes through a radially varying parallel flow profile; Description of the scale length of the flow profile; Use of the purely parallel flow to create transport barriers;...

  • Neoclassical transport coefficients for tokamaks with bean-shaped flux surfaces. Chang, C. S.; Kaye, S. M. // Physics of Fluids B: Plasma Physics;Feb91, Vol. 3 Issue 2, p395 

    Simple analytic representations of the neoclassical transport coefficients for indented flux surfaces are presented. It is shown that a transport coefficient for an indented flux surface can be expressed in terms of a linear combination of the previously known transport coefficients for two...

  • Lagrangian neoclassical transport theory applied to the region near the magnetic axis. Satake, Shinsuke; Okamoto, Masao; Sugama, Hideo // Physics of Plasmas;Sep2002, Vol. 9 Issue 9, p3946 

    Neoclassical transport theory around the magnetic axis of a tokamak is studied, in which relatively wide "potato" orbits play an important role in transport. Lagrangian formulation of transport theory, which has been investigated to reflect finiteness of guiding-center orbit widths to transport...

  • X-transport: A baseline nonambipolar transport in a diverted tokamak plasma edge. Chang, C. S.; Kue, Seunghoe; Weitzner, H. // Physics of Plasmas;Sep2002, Vol. 9 Issue 9, p3884 

    A new nonambipolar neoclassical transport (X-transport) mechanism has been identified which can be an irreducible baseline source of a strong radial electric field and edge pedestal formation immediately inside the separatrix in a diverted tokamak. Due to the vanishingly small poloidal magnetic...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics