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Languages : en
Pages :
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The results of five decades of experimental investigations of open-ended and closed magnetic confinement geometries are examined to see if intrinsic topology-dependent differences in their cross-field transport can be discerned. The evidence strongly supports a picture in which closed systems (stellarators, tokamaks, reversed-field pinches, etc.) are in all cases studied to date characterized by some level of plasma turbulence, leading to substantial deviations from purely classical cross-field transport. This transport is often describable as a Bohm-like scaling with plasma temperature and magnetic field intensity. By contrast, open systems have in many significant examples been able to approach closely to classically predicted cross-field transport, including cases where the transport appeared to be more than five orders of magnitude slower than the Bohm-diffusion rate. To explain these differences the following tentative hypothesis is put forward: The differences arise from two sources: (1) differences in the instability driving terms arising from free-energy sources, such as current flow along the field lines, etc. and, (2) differences in the nature of the boundary conditions for the various unstable waves that may be stimulated by these free energy sources within the plasma. By analogy with a laser, closed systems, with their flux tubes returning on themselves, resemble a ring resonator, while open systems either have or can be arranged to have absorptive (or low reflectivity) end boundary conditions for unstable waves. It is suggested that if the hypothesis is a valid one it further enhances the desirability of devoting more effort to the investigation of open-ended systems than is now being allotted.
Author: Max von Boehn
Publisher:
ISBN:
Category :
Languages : en
Pages : 234
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Author: Jan Weiland
Publisher: Springer Science & Business Media
ISBN: 1461437431
Category : Science
Languages : en
Pages : 235
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Book Description
Stability and Transport in Magnetic Confinement Systems provides an advanced introduction to the fields of stability and transport in tokamaks. It serves as a reference for researchers with its highly-detailed theoretical background, and contains new results in the areas of analytical nonlinear theory of transport using kinetic theory and fluid closure. The use of fluid descriptions for advanced stability and transport problems provide the reader with a better understanding of this topic. In addition, the areas of nonlinear kinetic theory and fluid closure gives the researcher the basic knowledge of a highly relevant area to the present development of transport physics.
Author:
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Category : Plasma engineering
Languages : en
Pages : 12
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Author: U.S. Atomic Energy Commission. Division of Controlled Thermonuclear Research
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 116
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Author: United States. Congress. House. Committee on Appropriations. Subcommittee on Public Works
Publisher:
ISBN:
Category : Public works
Languages : en
Pages : 1988
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Author: A N Skrinsky
Publisher: World Scientific
ISBN: 9814552542
Category : Science
Languages : en
Pages : 642
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Book Description
The International Conference on Open Plasma Confinement Systems for Fusion is dedicated to the memory of Gersh I Budker, in commemoration of his 75th birthday and held under the auspices of the Scientific Council on 'Plasma Physics' Complex Problem of the Russian Academy of Sciences. The main objectives of the Conference and its published Proceedings are to serve as a review of the progress made in open plasma confinement systems' development, in understanding the fundamental processes and the main problems of these systems, as well as to review the mirror reactor prospects.Among the authors of these papers are Profs. H Berk, B Chirikov, G Dimov, I Golovin, M Inutake, R Itatani, T Kawabe, E Kruglyakov, V Pastukhov, D Ryutov & T Tamano.
Author: United States. Congress. Senate. Committee on Appropriations
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1032
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Author: United States. Congress. House. Committee on Appropriations
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 1834
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Author: United States. Congress. House. Committee on Appropriations
Publisher:
ISBN:
Category :
Languages : en
Pages : 812
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