Results 271 to 280 of about 4,286 (293)

Scrape-off layer measurements in DIII-D

Journal of Nuclear Materials, 1992
In this paper, scrape-off layer measurements in DIII-D are presented as a function of the main discharge plasma parameters. A systematic study is under way to understand and predict the behavior of the edge and divertor plasma in DIII-D and this scaling behavior will be crucial for the design of ITER.
J.G. Watkins, R.A. Moyer, D.N. Hill, D. Buchenauer, T.N. Carlstrom, R. Conn, J. Cuthbertson, R. Doerner, R. Lehmer, M.A. Mahdavi, R.T. McGrath, L. Schmitz, R. Stambaugh   +12 more
openaire   +1 more source

Scrape-off layer current in diverted Tokamak

Nuclear Fusion, 1994
A negative current in the scrape-off region beyond the separatrix of a diverted Tokamak can improve its MHD stability. By utilizing a strong thermionic emitter a current of up to 25% of the plasma current can be driven in the scrape-off region. If the thermionic current is emitted at only one end of the open field lines, a current will flow in the ...
J Kesner, J.J Ramos, S.C Luckhardt
openaire   +1 more source

Computational Modelling of a Purely Neoclassical Scrape-Off Layer

Contributions to Plasma Physics, 2002
We study the Scrape-off Layer of ASDEX Upgrade in a scenario where the neoclassical transport phenomena are dominant with respect to the anomalous contributions. To represent such a neoclassical scenario, we implemented the expressions for the energy and momentum radial transport, toroidicity effects being introduced automatically by the tokamak ...
SUBBA, Fabio, X. BONNIN, R. SCHNEIDER, S. KUHN   +3 more
openaire   +3 more sources

On scrape off layer plasma transport

Physics Letters A, 2001
Abstract Qualitative physical picture describing fast convective radial plasma transport in tokamak scrape off layer is suggested. It is based on the hypothesis of detachment of high density plasma blobs from the bulk plasma due to turbulence effects resulting in plasma stratification in the region around separatrix.
openaire   +1 more source

Kinetic modeling of scrape-off layer plasmas

Physics of Plasmas, 1996
Electron transport along open field lines in the diverted scrape-off layer of a tokamak is studied numerically via a kinetic Fokker–Planck approach. The method allows calculation of the distribution function in a situation where large parallel temperature gradients are maintained by collisional relaxation and, at the same time, superthermal electrons ...
K. Kupfer, R. W. Harvey, O. Sauter, M. J. Schaffer, G. M. Staebler   +4 more
openaire   +1 more source

Modelling of Scrape‐Off Layer Biasing Experiments

Contributions to Plasma Physics, 1996
AbstractBased on the extended B2‐code a method has been developed to simulate electrode as well as divertor biasing experiments. To improve the convergence speed of the code a new implicit discretisation scheme for the potential equation based on the Braginski equations was implemented, incorporating viscosity and pressure gradient effects in the ...
M. van Schoor, M. Baelmans, R. R. Weynants   +2 more
openaire   +1 more source

3D Scrape-off layer modelling with BoRiS

Journal of Nuclear Materials, 2005
Abstract The 3D fluid transport code BoRiS is applied to a hydrogen plasma and a neutral fluid in a stellarator-like geometry equipped with a poloidal ring limiter. The results demonstrate the capability of dealing with 3D effects which can be related to both the influence of the geometry and the plasma–neutral interaction as well. The setup used has
Riemann, J., Borchardt, M., Schneider, R., Mutzke, A.   +3 more
openaire   +2 more sources

Towards Finite Element Modeling of the Tokamak Scrape‐Off Layer

Contributions to Plasma Physics, 1992
AbstractFinite elements provide a natural and flexible method for two‐dimensional fluid modeling of the tokamak scrape‐off layer. Here we present the first results obtained with the FELS code [1] on an unstructured grid, for the case of a toroidal limiter.
ZANINO, Roberto, PAOLINI M, RUSSO A.
openaire   +2 more sources

Parametric Study of Biased Scrape‐Off Layer

Contributions to Plasma Physics, 1992
AbstractThe particle and energy balance equations in the scrape‐off layer (SOL) plasma are solved analytically in a rectangular domain. The parallel flow is supposed to be convective, whereas the cross field flow is assumed diffusive, with modifications due to a radial E field.
openaire   +1 more source

Scrape-off layer turbulence modulated by Mirnov oscillations

Czechoslovak Journal of Physics, 2005
We investigate plasma turbulence at the scrape-off layer of TCABR tokamak. We apply a power spectral analysis to the magnetic Mirnov oscillations and electrostatic fluctuations, to quantify statistical properties and to estimate the turbulence-driven radial-particle flux.
M. V. A. P. Heller, I. L. Caldas, A. A. Ferreira, E. A. O. Saettone, A. Vannucci, I. C. Nascimento, J. H. F. Severo   +6 more
openaire   +1 more source