Tokamak Edge Plasma Modeling Using an Improved Onion-skin Method PDF Download
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Languages : en
Pages :
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Languages : en
Pages :
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Author: Wojciech R. Fundamenski
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Category :
Languages : en
Pages : 0
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Boundary (edge) plasma phenomena play a crucial role in the development of controlled thermonuclear fusion via magnetic confinement. In this work, the edge plasma are modeled by a coupled set of plasma/neutral transport equations; the neutral transport equations are solved by Monte-Carlo techniques (NIMBUS code), while the plasma transport equations are solved using an improved onion-skin method (OSM) based on the numerical techniques of computational fluid dynamics. The OSM approach, as defined in this thesis, consists of replacing the anomalous cross-field flux terms by (often simplified, always adjustable) cross-field source terms, and taking advantage of available diagnostic data (typically radial profiles of ã and Te from target Langmuir probes), of varying these cross-field sources in order to minimize the error between the solution and the diagnostic data. The OSM approach was shown capable of capturing the transition from attached to detached conditions in a tokamak divertor plasma, an important and timely aspect of present fusion research. The other applications presented in the thesis include a study of the sensitivity of modeling assumptions, a code-code comparison between the OSM and a standard 2D approach (represented by the EDGE2D code), and a code-experiment comparison with reciprocating probe data for Ohmic, L-mode and H-mode shots on the JET tokamak.
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Category : Dissertations, Academic
Languages : en
Pages : 870
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Category : Electronic journals
Languages : en
Pages : 786
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Category : Dissertation abstracts
Languages : en
Pages : 848
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Category : Fusion reactors
Languages : en
Pages : 512
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Category : Metallurgy
Languages : en
Pages : 1628
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Author:
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Category : Metallurgy
Languages : en
Pages : 1622
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Author: P.C Stangeby
Publisher: CRC Press
ISBN: 9780750305594
Category : Science
Languages : en
Pages : 738
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Book Description
The Plasma Boundary of Magnetic Fusion Devices introduces the physics of the plasma boundary region, including plasma-surface interactions, with an emphasis on those occurring in magnetically confined fusion plasmas. The book covers plasma-surface interaction, Debye sheaths, sputtering, scrape-off layers, plasma impurities, recycling and control, 1D and 2D fluid and kinetic modeling of particle transport, plasma properties at the edge, diverter and limiter physics, and control of the plasma boundary. Divided into three parts, the book begins with Part 1, an introduction to the plasma boundary. The derivations are heuristic and worked problems help crystallize physical intuition, which is emphasized throughout. Part 2 provides an introduction to methods of modeling the plasma edge region and for interpreting computer code results. Part 3 presents a collection of essays on currently active research hot topics. With an extensive bibliography and index, this book is an invaluable first port-of-call for researchers interested in plasma-surface interactions.
Author: United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Investigations and Oversight
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Category :
Languages : en
Pages : 826
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