Helium, Iron and Electron Particle Transport and Energy Transport Studies on the TFTR Tokamak PDF Download

Author: P. C. Efthimion
Publisher:
ISBN:
Category : Tokamak Fusion Test Reactor (Project).
Languages : en
Pages : 41

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 42

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Book Description
Results from helium, iron, and electron transport on TFTR in L-mode and Supershot deuterium plasmas with the same toroidal field, plasma current, and neutral beam heating power are presented. They are compared to results from thermal transport analysis based on power balance. Particle diffusivities and thermal conductivities are radially hollow and larger than neoclassical values, except possibly near the magnetic axis. The ion channel dominates over the electron channel in both particle and thermal diffusion. A peaked helium profile, supported by inward convection that is stronger than predicted by neoclassical theory, is measured in the Supershot The helium profile shape is consistent with predictions from quasilinear electrostatic drift-wave theory. While the perturbative particle diffusion coefficients of all three species are similar in the Supershot, differences are found in the L-Mode. Quasilinear theory calculations of the ratios of impurity diffusivities are in good accord with measurements. Theory estimates indicate that the ion heat flux should be larger than the electron heat flux, consistent with power balance analysis. However, theoretical values of the ratio of the ion to electron heat flux can be more than a factor of three larger than experimental values. A correlation between helium diffusion and ion thermal transport is observed and has favorable implications for sustained ignition of a tokamak fusion reactor.

Author:
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ISBN:
Category :
Languages : en
Pages : 11

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Particle and energy transport in tokamak plasmas have long been subjects of vigorous investigation. Present-day measurement techniques permit radially resolved studies of the transport of electron perturbations, low- and high-Z impurities, and energy. In addition, developments in transport theory provide tools that can be brought to bear on transport issues. Here, we examine local particle transport measurements of electrons, fully-stripped thermal helium, and helium-like iron in balanced-injection L-mode and enhanced confinement deuterium plasmas on TFTR of the same plasma current, toroidal field, and auxiliary heating power. He{sup 2{plus}} and Fe{sup 24{plus}} transport has been studied with charge exchange recombination spectroscopy, while electron transport has been studied by analyzing the perturbed electron flux following the same helium puff used for the He{sup 2{plus}} studies. By examining the electron and He{sup 2{plus}} responses following the same gas puff in the same plasmas, an unambiguous comparison of the transport of the two species has been made. The local energy transport has been examined with power balance analysis, allowing for comparisons to the local thermal fluxes. Some particle and energy transport results from the Supershot have been compared to a transport model based on a quasilinear picture of electrostatic toroidal drift-type microinstabilities. Finally, implications for future fusion reactors of the observed correlation between thermal transport and helium particle transport is discussed.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 3

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Studies of local multispecies thermal particle and energy transport in L-mode and supershot deuterium plasmas have been performed on the Tokamak Fusion Test Reactor (TFTR). These studies were undertaken to help gain insight into the anomalous transport properties of the bulk plasma. Such experimental and theoretical studies are valuable for ITER: the relationship of local helium ash and metallic particle transport to local energy transport will be determining factors in plasma current, helium pumping, and divertor material requirements. In addition, differences between electron and ion transport will have important implications for plasma fueling scenarios. Here, attention has been focused on supershots and L-Modes of the same toroidal field, plasma current, neutral beam heating power.

Author: Ronald E. Bell
Publisher:
ISBN:
Category : Tokamak Fusion Test Reactor (Project).
Languages : en
Pages : 14

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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 526

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Author: Leslie Colin Woods
Publisher: John Wiley & Sons
ISBN: 3527607269
Category : Science
Languages : en
Pages : 252

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In this new approach for a consistent transport theory in nuclear fusion processes Leslie Woods draws on over 40 years of fusion research to directly compare theoretical findings with experimental results, while taking into account recently discovered phenomena. This is thus the first book to find theoretical explanations to the sometimes-puzzling tokamak observations. Following a look at the quest for fusion power, the author goes on to examine tokamak magnetic fields and energy losses, as well as plasma flow and loop voltage. There is also a discussion of the technical constraints on the recently announced ITER design.

Author: E. J. Synakowski
Publisher:
ISBN:
Category :
Languages : en
Pages : 3

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Author: John Wesson
Publisher: Oxford University Press
ISBN: 0199592233
Category : Science
Languages : en
Pages : 828

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The tokamak is the principal tool in controlled fusion research. This book acts as an introduction to the subject and a basic reference for theory, definitions, equations, and experimental results. The fourth edition has been completely revised, describing their development of tokamaks to the point of producing significant fusion power.

Author: Nicholas Deliyanakis
Publisher:
ISBN:
Category : Electron cyclotron resonance sources
Languages : en
Pages : 498

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