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Impurity transport in detached plasmas
Plasma Physics and Controlled Fusion, 1989Transport of metallic impurities in the plasma edge was compared for normal and detached Tokamak plasmas. A neo-classical model, valid for a dirty plasma in the Pfirsch-Schluter regime, was used to calculate the impurity flux terms. Changes in the edge density and temperature profiles, characteristic of detached discharges, were seen to greatly ...
Y Demers, J Castracane
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Nonthermal Impurity Radiation from a Spherical Plasma
The Physics of Fluids, 1963The steady-state energy loss of a homogeneous and isothermal spherical plasma due to de-excitation radiation of impurity ions, assumed to have two energy levels only, is investigated without making the assumption that this radiation is thermal. A method developed by R. N.
Cuperman, S., Engelmann, F., Oxenius, J.
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Plasma Physics and Controlled Fusion
Abstract A theory is presented to describe fluctuation dynamics in magnetized plasmas with impurities. In particular, it is shown that impurities can significantly facilitate an abrupt transient increase of fluctuation amplitude. To demonstrate this, a fluid model is derived to describe how impurities enter fluctuation dynamics.
Y Kosuga, J Bourgeois, M Lesur, I Oyama
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Abstract A theory is presented to describe fluctuation dynamics in magnetized plasmas with impurities. In particular, it is shown that impurities can significantly facilitate an abrupt transient increase of fluctuation amplitude. To demonstrate this, a fluid model is derived to describe how impurities enter fluctuation dynamics.
Y Kosuga, J Bourgeois, M Lesur, I Oyama
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Impurity Radiation from Medium Density Plasmas
Nuclear Technology, 1977Impurity radiation from plasmas of densities typical of tokamaks and mirrors is examined for a variety of impurity species over a wide temperature range. Calculations indicate that radiative losses are enhanced during the early phase of the stripping process and that the radiation is much greater at temperatures characteristic of many electron atoms ...
G. R. Hopkins, John M. Rawls
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Impurity transport in ITER-like plasmas
Physics of Plasmas, 2006Neoclassical impurity transport is compared with transport calculated from the reactive drift wave model of turbulent transport for an ITER-like [R. Aymar, P. Barabaschi, and Y. Shimomura, Plasma Phys. Controlled Fusion 44, 519 (2002)] scenario. The turbulent transport is inward for both main ions and impurities, but the impurity ion inward transport ...
T. Fülöp, J. Weiland
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Plasma Models for Impurity Control Experiments
1986There have been significant advances in impurity control modeling in the last five years. The models for impurity control has grown in sophistication from simple, almost heuristic models to two and three-dimensional codes embodying realistic geometries and many of the important plasma wall and atomic physics processes.
D. E. Post, K. Lackner
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Plasma Stimulated Impurity Redistribution in Silicon
Physica Status Solidi (a), 1989The influence of low temperature (≈100 °C) plasma treatment on the properties of silicon near surface layers is studied. A decrease in concentration of deep level centres as well as the formation of the new vacancy related complexes at a depth of 1 to 10 μm are observed.
S. V. Koveshnikov +3 more
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Jet impurity results in helium plasmas
Journal of Nuclear Materials, 1989During JET operation in 3He and 4He, a higher density limit is observed than in deuterium, density control is easier and radiation losses are lower during ICRH. Also, there are lasting beneficial effects on subsequent D discharges. Impurity behaviour, particle confinement and residual deuterium content of these plasmas have been studied by visible and ...
K. Behringer +4 more
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