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Impurity transport and neoclassical predictions
Plasma Physics and Controlled Fusion, 1991The authors present a brief review of collisional (classical and neoclassical) and anomalous transport. Particular emphasis is devoted to the question of charge independence of the anomalous transport coefficients and the combined action of anomalous and collisional transport.
Fussmann, G. +5 more
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AIP Conference Proceedings, 2008
Impurity transport is an important topic for ITER as impurity density in the core has to stay below a relative concentration of 5×10−5 [1] to reach ignition conditions. The reasons for that is mainly impurity radiation leading to cooling. In the edge region on the other hand site, higher impurity densities, going along with radiation energy losses are ...
Volker Naulin +7 more
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Impurity transport is an important topic for ITER as impurity density in the core has to stay below a relative concentration of 5×10−5 [1] to reach ignition conditions. The reasons for that is mainly impurity radiation leading to cooling. In the edge region on the other hand site, higher impurity densities, going along with radiation energy losses are ...
Volker Naulin +7 more
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Impurity effects on drift wave stability and impurity transport
Nuclear Fusion, 1993A numerical linear stability analysis of electrostatic ion temperature gradient (ITG) and dissipative trapped electron (DTE) modes in a three-component plasma (electrons, primary ions and impurity ions) is performed using a fully kinetic, sheared slab model. The quasi-linear particle and energy fluxes for each species are also computed.
R.R Dominguez, G.M Staebler
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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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Impurities and impurity transport in the spheromak SPHEX
Plasma Physics and Controlled Fusion, 1997Absolute spectroscopic measurements are made of all significant ionization states of the dominant impurities in SPHEX during sustained operation, and these are compared with a diffusive transport model to derive average plasma parameters. Statistical tests are used to establish the reliability of these results.
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Impurity transport in percolation media
Journal of Experimental and Theoretical Physics Letters, 2004An equation describing the impurity transport in a percolation medium is obtained and the inferences drawn from this equation are analyzed based on the scale invariance concept. A determining part in this analysis is allowance for the sinks inherent in such media.
A. M. Dykhne +2 more
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Thermoelectric resonant transport through the Anderson impurities
Physical Review B, 1995The low-temperature thermoelectric resonant transport through the Anderson impurities under the Kondo resonance conditions is studied. It is shown that for the smooth Anderson impurity (AI) density of states the thermoelectric current is parametrically larger than that in the absence of on-site Coulomb correlation, which is the signature of the Kondo ...
, Afonin, , Rudin
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Theory of transport by impurities
Soviet Physics Journal, 1969The method of the B(t) field is used to analyze conductivity by means of impurities. The case of nonmetallic conductivity with a low degree of compensation is discussed. It is shown that the activation energy in the representation of the B(t) field is equal to the binding energy in the “trap.” The anomalous dependence on the degree of compensation is ...
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Analysis of classical impurity transport
Nuclear Fusion, 1976This work is an application of Braginskii's classical theory of particle transport to partially ionized plasmas in cylindrical geometry or toroidal geometry in the Pfirsch-Schluter regime. Particular attention is given to the steady state, for which density and flux distributions are determined, and the re-cycling phenomenon is analysed.
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