Results 261 to 270 of about 120,584 (295)
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Impurity transport and density in TdeV
Plasma Physics and Controlled Fusion, 1992The authors study the modelling of light impurity transport in TdeV (Tokamak de Varennes) Ohmic discharges with graphite poloidal limiters. The impurity fraction, the diffusivity and the convective velocity were determined by comparison of measured C IV, O VII and Ne IX line intensities (VUV spectroscopy) with MIST simulated profiles.
E Haddad +3 more
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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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Measurements of impurity transport in jet
Plasma Physics and Controlled Fusion, 1992Impurity transport has been studied in JET using the laser blow-off technique. Results are presented for Ohmic, L-mode and H-mode plasmas. In all cases impurity transport was found to be small inside r/a approximately 0.3 with values for D approximately 0.03-0.3 m2 s-1 close to neoclassical predictions.
D Pasini +7 more
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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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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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Deterministic Ratchet Transport of Impurities in Fluids
International Journal of Bifurcation and ChaosThis paper investigates unbiased directed transport, known as the ratchet effect, within a system coupled to a fluid modeled by the bailout embedding technique. The system dynamics under the fluid influence are described by a four-dimensional mapping governed by parameters such as dissipation ([Formula: see text]), ratchet kicking (K), and the ...
Tulio M. de Oliveira +2 more
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Impurity transport at the plasma edge
Journal of Nuclear Materials, 1990Abstract Of the three major links in the chain connecting plasma edge conditions to central impurity levels, that is, (a) production (b) edge transport (c) central transport, edge transport is the weakest link in that it is the most complex, least understood and hardest to measure directly.
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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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Asymptotic theory of the classical impurity transport. Fermat’s principle
Annals of Physics, 2022Peter S Kondratenko
exaly