Results 251 to 260 of about 131,786 (274)

Metallic Impurities in Fusion Plasmas

Physica Scripta, 1991
The sources, content and collision processes of metallic impurities in fusion plasmas are discussed from the point of view of their impact on the fusion reactor design. The required collision cross section information is outlined.
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Impurity transport in ICRH tokamak plasma

Nuclear Fusion, 1985
Energetic ion tails created by ion cyclotron resonance heating can cause inward diffusion of impurities from the tokamak periphery. The inward pinch velocity is proportional to the charge of the impurities and can be comparable to or higher than the neoclassical pinch velocity for the present-day experimental regime. It depends critically on the plasma
V.S. Chan, S.C. Chiu, S.K. Wong
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Impurity behaviour in Heliotron E plasmas

Journal of Electron Spectroscopy and Related Phenomena, 1996
Abstract Observations of resonance lines in the 150 to 400A spectral range provide useful information regarding the behaviour of impurities in a laboratory plasma. Heliotron E emission spectra were recorded using a time-resolved VUV spectroscopy system, and line emission in this range was found to be dominated by impurity radiation from oxygen ...
C Christou, K Kondo, F Sano, H Zushi, T Mizuuchi, S Besshou, H Okada, K Nagasaki, Y Kurimoto, H Funaba, T Hamada, T Kinosita, S Kado, M Wakatani, T Obiki   +14 more
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Modeling impurity transfer to tokamak plasma

Technical Physics Letters, 2003
Mechanisms of the impurity transfer inside a tokamak separatrix have been studied. It is shown that poloidal rotation significantly influences the poloidal distribution of impurities. An analysis of the neoclassical component of the radial impurity flux showed that this fraction is described by an expression that is more complicated than the standard ...
E. G. Kaveeva, A. H. Bekheit, S. P. Voskoboynikov, V. A. Rozhansky, D. Coster, X. Bonnin, R. Schneider   +6 more
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Excited impurity species and plasma transport

Journal of Physics B: Atomic, Molecular and Optical Physics, 1988
The authors discuss the role of charge exchange in collisions between protons and thermally excited impurity ions in modifying the cross-field transport of hydrogen. It is assumed that electron collisions with partially stripped impurity ions maintain a population of highly excited, highly charged ions, which produce neutral hydrogen by charge exchange
P T Greenland, M F A Harrison
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Impurity radiation from a tokamak plasma

Plasma Physics Reports, 2007
In tokamak operating modes, energy balance is often governed by impurity radiation. This is the case near the divertor plates, during impurity pellet injection, during controlled discharge disruptions, etc. The calculation of impurity radiation is a fairly involved task (it is sometimes the most difficult part of the general problem) because the ...
D. Kh. Morozov, E. O. Baronova, I. Yu. Senichenkov   +2 more
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Runaway electrons in an impure plasma

The Physics of Fluids, 1976
The electron runaway theories of Kruskal and Bernstein and Lebedev are extended to apply to multiply ionized, multiple species plasmas. The resulting expressions for electron runaway rates are compared with results obtained by Kulsrud, Sun, Winsor, and Fallon from numerical solutions of the Fokker–Planck equation.
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Role of impurities in fusion plasmas

AIP Conference Proceedings, 2008
The role of impurity at the plasma edge of fusion devices is considered by analysing the influence on radiation losses and anomalous transport of particle and energy. The conditions critical for the development of radiative instabilities leading to the formation of detachment and MARFE and those necessary for the creation of a stable radiating edge ...
M. Z. Tokar, Padma K. Shukla, Bengt Eliasson, Lennart Stenflo   +3 more
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Plasma transport computations for high-beta plasmas with impurities and neutrals

Nuclear Fusion, 1976
The evolution of a high-s plasma after the initial dynamic phase is described by a multifluid (electrons, hydrogenic ions, neutrals, and impurities) model for a belt-pinch configuration. The numerical results obtained from the model agree with experimental findings from th e Garching Belt Pinch II.
Becker, G., Duechs, D.
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Slow Thermal Waves in Impurity Seeded Radiative Plasmas

Physical Review Letters, 1996
Linear and nonlinear wave propagation in optically thin, impurity seeded radiative plasmas is studied in slab geometry. Taking into account the thermal force that acts on impurity ions leads to a new type of slightly damped or slightly unstable subsonic waves that propagate within limited ranges of temperature.
, Morozov, , Herrera
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