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Low Z impurity transport in tokamaks. [Neoclassical transport theory]

Authors: Hawryluk, R.J.; Suckewer, S.; Hirshman, S.P.;

Low Z impurity transport in tokamaks. [Neoclassical transport theory]

Abstract

Low Z impurity transport in tokamaks was simulated with a one-dimensional impurity transport model including both neoclassical and anomalous transport. The neoclassical fluxes are due to collisions between the background plasma and impurity ions as well as collisions between the various ionization states. The evaluation of the neoclassical fluxes takes into account the different collisionality regimes of the background plasma and the impurity ions. A limiter scrapeoff model is used to define the boundary conditions for the impurity ions in the plasma periphery. In order to account for the spectroscopic measurements of power radiated by the lower ionization states, fluxes due to anomalous transport are included. The sensitivity of the results to uncertainties in rate coefficients and plasma parameters in the periphery are investigated. The implications of the transport model for spectroscopic evaluation of impurity concentrations, impurity fluxes, and radiated power from line emission measurements are discussed.

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United States
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Keywords

Emission Spectra, Limiters, One-Dimensional Calculations, Radiation Transport, Tokamak Devices, Thermonuclear Devices 700105* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Theoretical-- (-1987), 70 Plasma Physics And Fusion Technology, Spectra, Boundary Conditions, Charged-Particle Transport, Impurities, Closed Plasma Devices

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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