Behavior of the Particle Transport Coefficients Near the Density Limit in MTX PDF Download
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Author: Michael Martin Marinak
Publisher:
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Category :
Languages : en
Pages : 408
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Author: Michael Martin Marinak
Publisher:
ISBN:
Category :
Languages : en
Pages : 408
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Book Description
Author:
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ISBN:
Category :
Languages : en
Pages : 202
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The perturbed particle transport coefficients were determined for a range of plasma conditions in the Alcator C tokamak, a component of the Microwave Tokamak Experiment (MTX), from analysis of density perturbations created in gas modulation experiments. Density measurements from a 15 chord far-infrared interferometer were sufficiently detailed to allow radial profiles of the transport coefficients to be resolved. Gas modulation experiments were carried out on plasmas over a range of relatively low currents and a wide variety of line-averaged densities, including values near the Greenwald density limit. With this technique the perturbed diffusion coefficient D and the perturbed convection velocity V can be determined simultaneously. Measured profiles of D rise toward the outside of the plasma column in a manner generally similar to those determined previously for [chi]{sub e, HP} from sawtooth heat pulse propagation. Values of D are typically smaller than those of [chi]{sub e, HP} given for the same line-averaged densities by a factor of 2-5. Diffusion coefficients from a series of discharges at constant current showed little variation with density through most of the saturated ohmic confinement regime. At the Greenwald density limit threshold a dramatic increase occurred in both the perturbed convective and diffusive transport coefficients in the outer region of the plasma. The increases were most pronounced at the outermost range of the radii where coefficients were determined (r/a = 0.8), but were apparent over a region which extended well into the plasma interior. Density profiles maintained a similar shape near the density limit, congruous with the similar behavior of the transport coefficients. No dramatic deterioration was evident in the global energy confinement.
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Category : Aeronautics
Languages : en
Pages : 818
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Category : Power resources
Languages : en
Pages : 724
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Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
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Category : Government reports announcements & index
Languages : en
Pages : 1372
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Category : Dissertations, Academic
Languages : en
Pages : 658
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Category : Electronic journals
Languages : en
Pages : 810
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Category : Science
Languages : en
Pages : 1072
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Author: John Crank
Publisher: Oxford University Press
ISBN: 9780198534112
Category : Mathematics
Languages : en
Pages : 428
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Though it incorporates much new material, this new edition preserves the general character of the book in providing a collection of solutions of the equations of diffusion and describing how these solutions may be obtained.
Author: Roger John Tayler
Publisher: Taylor & Francis Group
ISBN: 9780750302005
Category : Science
Languages : en
Pages : 356
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Book Description
Stellar Astrophysics contains a selection of high-quality papers that illustrate the progress made in research into the structure and evolution of stars. Senior undergraduates, graduates, and researchers can now be brought thoroughly up to date in this exciting and ever-developing branch of astronomy.
