Results 291 to 300 of about 2,872,515 (340)

Impurity effects on drift wave stability and impurity transport

Nuclear Fusion, 1993
A 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
openaire   +1 more source

Impurity transport in detached plasmas

Plasma Physics and Controlled Fusion, 1989
Transport 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
openaire   +1 more source

Impurities and impurity transport in the spheromak SPHEX

Plasma Physics and Controlled Fusion, 1997
Absolute 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.
openaire   +1 more source

Impurity transport in T-10 plasmas with ohmic heating

Plasma Physics and Controlled Fusion, 2018
Impurity transport in the T-10 tokamak plasma with ohmic heating is studied in this paper. The values of various impurities densities, measured with the use of passive spectral diagnostics in the visible (Zeff), active charge exchange measurements (He, C,
V. Krupin, L. Klyuchnikov, M. Nurgaliev, A. Nemets, I. Zemtsov, A. Melnikov, T. Myalton, D. Sarychev, D. Sergeev, A. Sushkov, V. Trukhin, S. Tugarinov, N. Naumenko   +12 more
semanticscholar   +1 more source

Impurity transport in percolation media

Journal of Experimental and Theoretical Physics Letters, 2004
An 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, P. S. Kondratenko, L. V. Matveev   +2 more
openaire   +1 more source

Thermoelectric resonant transport through the Anderson impurities

Physical Review B, 1995
The 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
openaire   +2 more sources

Theory of transport by impurities

Soviet Physics Journal, 1969
The 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 ...
openaire   +1 more source

Analysis of classical impurity transport

Nuclear Fusion, 1976
This 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.
openaire   +1 more source

Low-Z impurity transport in tokamaks

Nuclear Fusion, 1979
Low-Z impurity transport in tokamaks was simulated with a one-dimensional impurity transport model including both neoclassical and anomalous transports. The neoclassical fluxes are due to collisions between the background plasma and impurity ions as well as to collisions between the various ionization states.
R.J. Hawryluk, S. Suckewer, S.P. Hirshman   +2 more
openaire   +1 more source

Transport Through Artificial Kondo Impurities

2001
We report an experiment performed on a few-electron quantum dot in which the quantum numbers of the occupied electron states can be precisely identified. Besides the usual Kondo behavior for spin=l/2 and odd electron number, an unexpected Kondo effect is observed for an even electron number.
S. De Franceschi, S. Sasaki, J. M. Elzerman, W. G. van der Wiel, S. Tarucha, L. P. Kouwenhoven   +5 more
openaire   +1 more source