Author: Mark Edward ValentiPublisher:
ISBN:
Category :
Languages : en
Pages : 108
Book Description
Neutral Particle Transport Modeling with a Reflective Source in the Plasma Edge
Author: Mark Edward ValentiObservations justes et curieuses sur le Calendrier romain...
Author: Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 832
Book Description
Neutral Particle Transport in Plasma Edge Using Transmission/Escape Probability (TEP) Method
Author: Dingkang ZhangPublisher:
ISBN:
Category : Plasma injection
Languages : en
Pages :
Book Description
Neutral particles play an important role on the performance of tokamak plasmas. In this dissertation, the original TEP methodology has been extended to take into account linearly (DP-1) and quadratically (DP-2) anisotropic distributions of angular fluxes for calculations of transmission probabilities. Three approaches, subdivision of optically thick regions, expansion of collision sources and the diffusion approximation, have been developed and implemented to correct effects of the preferential probability of collided neutrals escaping back across the incident surface. Solving the diffusion equation via the finite element method has been shown to be the most computationally efficient and accurate for a broader range of D/l by comparisons with Monte Carlo simulations. The average neutral energy (ANE) approximation has been developed and implemented into the GTNEUT code. The average neutral energy approximation has been demonstrated to be more accurate than the original local ion temperature (LIT) approximation for optically thin regions. The simulations of the upgraded GTNEUT code excellently agree with the DEGAS predictions in DIII-D L-mode and H-mode discharges, and the results of both the codes are in a good agreement with the experimental measurements.
Neutral Particle Transport in the Plasma Edge and Divertor Region
Author: Roberto RubilarPublisher:
ISBN:
Category : Plasma injection
Languages : en
Pages : 400
Book Description
Plasmas
Author: C. F. BarnettPublisher: Academic Press
ISBN: 1483218678
Category : Science
Languages : en
Pages : 517
Book Description
Applied Atomic Collision Physics, Volume 2: Plasmas covers topics on magnetically confined plasmas. The book starts by providing the history of fusion research and describing the various approaches in both magnetically and inertially confined plasmas. The text then gives a general discussion of the basic concepts and properties in confinement and heating of a plasma. The theory of atomic collisions that result in excited quantum states, particularly highly ionized impurity atoms; and diverse diagnostic topics such as emission spectra, laser scattering, electron cyclotron emission, particle beams, and bremsstrahlung are also considered. The book further tackles heating of plasma by energetic particles; the boundary or edge plasma and particle-surface interactions; and the role of atomic physics in hot dense plasmas. Physicists and people involved in plasma and fusion energy studies will find the book invaluable.
Nuclear Fusion Research
Author: Robert E. H. ClarkPublisher: Springer Science & Business Media
ISBN: 354027362X
Category : Science
Languages : en
Pages : 467
Book Description
It became clear in the early days of fusion research that the effects of the containment vessel (erosion of "impurities") degrade the overall fusion plasma performance. Progress in controlled nuclear fusion research over the last decade has led to magnetically confined plasmas that, in turn, are sufficiently powerful to damage the vessel structures over its lifetime. This book reviews current understanding and concepts to deal with this remaining critical design issue for fusion reactors. It reviews both progress and open questions, largely in terms of available and sought-after plasma-surface interaction data and atomic/molecular data related to these "plasma edge" issues.
Fusion Energy Update
Author: Physics of Plasma-Wall Interactions in Controlled Fusion
Author: D. E. PostPublisher: Springer Science & Business Media
ISBN: 1475700679
Category : Science
Languages : en
Pages : 1178
Book Description
Controlled thermonuclear fusion is one of the possible candidates for long term energy sources which will be indispensable for our highly technological society. However, the physics and technology of controlled fusion are extremely complex and still require a great deal of research and development before fusion can be a practical energy source. For producing energy via controlled fusion a deuterium-tritium gas has to be heated to temperatures of a few 100 Million °c corres ponding to about 10 keV. For net energy gain, this hot plasma has to be confined at a certain density for a certain time One pro mising scheme to confine such a plasma is the use of i~tense mag netic fields. However, the plasma diffuses out of the confining magnetic surfaces and impinges on the surrounding vessel walls which isolate the plasma from the surrounding air. Because of this plasma wall interaction, particles from the plasma are lost to the walls by implantation and are partially reemitted into the plasma. In addition, wall atoms are released and can enter the plasma. These wall atoms or impurities can deteriorate the plasma performance due to enhanced energy losses through radiation and an increase of the required magnetic pressure or a dilution of the fuel in the plasma. Finally, the impact of the plasma and energy on the wall can modify and deteriorate the thermal and mechanical pro perties of the vessel walls.
Transport of Neutral Atoms and Molecules in TFCX.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The distribution of neutrals in the proposed reactor TFCX has been modeled by the 3-D Monte Carlo neutral transport code DEGAS, which has been run in conjunction with the 1-1/2-D time-dependent plasma transport code WHIST. The former code contains the best available treatment of neutral-particle physics, including a selection of wall reflection models. The latter code has a comprehensive set of plasma transport coefficients, an MHD equilibrium package, and provision for source terms such as those involving neutrals. It has a simple scrape-off model involving sound-speed flow to the neutralizer plates. The codes are run in iteration, so that the flux-surface averaged particle and energy sources due to interactions with neutrals are consistent with the plasma profiles. The design considered here has a bottom limiter with a pumping plenum. Results are given for the power balance, the mutually consistent plasma and neutral distributions set up in the edge region, the neutral density in the plenum, and the charge-exchange power deposition and erosion along the limiter.