Author: Stephen Joseph Tobin
Publisher:
ISBN:
Category :
Languages : en
Pages : 292

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 6

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In a steady-state tokamak, impurity production and transport from plasma facing components will have to be controlled. Recent results from several divertor tokamaks suggest the importance of chemical sputtering as an impurity production mechanism. However, since impurity production is minimized in high recycling divertor configurations, the quantitative characterization of impurity generation is more difficult than in the high heat flux environment of a limiter configuration. A quantitative study of the role of temperature dependent sputtering mechanisms on the outboard limiter in Tore Supra was performed. The methane flux proved to be significantly reduced above surface temperatures of 1,100 C and negligible above 1,300 C. The peak in the methane yield as a function of surface temperature is consistent with lab results. It was determined that chemical sputtering (early in the shot) had a small, to negligible, impact on the C flux; while RES (late in the shot) had a strong impact on the C flux. However, from the Z{sub eff} measurements, it was concluded that neither process contributed to the core carbon content.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Models for the edge conditions which are commonly used in tokamak transport codes have been kept simple partly because of a lack of data. A report is presented on an improved model for the particle and energy balance of e−, H1, H1°, H2, H2°, O°, O/sup (1 yields 8)/sup +// in the plasma scrape-off region. Experiments should yield the needed data in the near future, and allow one to test the model. The diffusion of impurities has been studied with a neoclassical model. The role of 'anomalous spreading' of the impurity distribution has been studied for the case of Fe. A model is presented for the expulsion of low-Z (oxygen) impurities for cases where q(0) greater than 1, but in which a large shear-free region is produced in the plasma core.

Author: Jakob Nygren
Publisher:
ISBN:
Category :
Languages : en
Pages : 41

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Author: Alcator Group
Publisher:
ISBN:
Category :
Languages : en
Pages : 12

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Author: L. J. Reinders
Publisher: Springer Nature
ISBN: 3030643441
Category : Science
Languages : en
Pages : 628

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This carefully researched book presents facts and arguments showing, beyond a doubt, that nuclear fusion power will not be technically feasible in time to satisfy the world's urgent need for climate-neutral energy. The author describes the 70-year history of nuclear fusion; the vain attempts to construct an energy-generating nuclear fusion power reactor, and shows that even in the most optimistic scenario nuclear fusion, in spite of the claims of its proponents, will not be able to make a sizable contribution to the energy mix in this century, whatever the outcome of ITER. This implies that fusion power will not be a factor in combating climate change, and that the race to save the climate with carbon-free energy will have been won or lost long before the first nuclear fusion power station comes on line. Aimed at the general public as well as those whose decisions directly affect energy policy, this book will be a valuable resource for informing future debates.

Author:
Publisher:
ISBN:
Category : Pharmacy
Languages : en
Pages : 536

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Author: William R. Tiffany
Publisher: McGraw-Hill Humanities, Social Sciences & World Languages
ISBN:
Category : Language Arts & Disciplines
Languages : en
Pages : 456

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Author:
Publisher: Omair Nazir
ISBN:
Category :
Languages : en
Pages : 18

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Author: Alessandra Ceretto
Publisher: Lulu.com
ISBN: 136509796X
Category :
Languages : en
Pages : 192

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