Results 231 to 240 of about 2,926 (263)

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

Effects of poloidally asymmetric sources in the scrape-off layer

Journal of Nuclear Materials, 1990
Abstract Significant in-outboard and up-down asymmetries of power load and plasma parameters at the divertor plates have been observed in several tokamaks. In this paper we study the problem considering the idealized situation of two divertor chambers connected by straight magnetic field lines, under the assumption that the plates are electrically ...
openaire   +3 more sources

Heat transport in the JET scrape-off layer

Nuclear Fusion, 1998
The DIVIMP/NIMBUS onion skin model (OSM) has been used to calculate 2-D plasma distributions of ne, Te and Ti in the JET edge, based on boundary conditions measured across the targets with built-in Langmuir probes. Ohmic, L mode and ELMy H mode discharges were analysed.
S.K Erents, P.C Stangeby
openaire   +1 more source

On “Recycling” Instability of the Scrape-off Layer Plasma

Plasma Physics Reports, 2021
A new type of scrape-off layer plasma instability associated with radial inhomogeneity of plasma density, contact of plasma with conducting material surfaces, and neutral recycling is presented. In order to elucidate the physics of this instability, the simplest possible setup is analyzed.
openaire   +1 more source

A model for the turbulence in the scrape-off layer of tokamaks

Nuclear Fusion, 1991
The fluid theory of electrostatic perturbations in a scrape-off layer (SOL) plasma is analysed. The main difficulty is that the edge is theoretically found to be stable, while experimentally it is unstable. A possible explanation relies on the fact that the commonly used ballooning representation is not correct in the SOL. An alternative representation
X. Garbet, L. Laurent, J.-P. Roubin, A. Samain   +3 more
openaire   +1 more source

Parallel flow in the JET scrape-off layer

Plasma Physics and Controlled Fusion, 2000
Parallel plasma flows with Mach number M≈0.5 have been measured in the JET scrape-off layer (SOL). These flows show a maximum some 10-20 mm mid-plane outside the separatrix, and decrease towards the separatrix. The flow reverses when BT and IP are reversed, but is asymmetric about zero.
S K Erents, A V Chankin, G F Matthews, P C Stangeby   +3 more
openaire   +1 more source

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

Probe measurements in the scrape-off layer of a Tokamak

Plasma Physics, 1978
A Langmuir probe is used to study the plasma behaviour in the scrape-off layer of JFT-2a, (a Tokamak with an axisymmetric divertor). The measurements reveal particle fluxes to the divertor and the wall as well as cross-field profiles of density and potential in the scrape-off layer.
H Ohtsuka, H Kimura, S Shimomura, H Maeda, S Yamamoto, M Nagami, N Ueda, A Kitsunezaki, T Nagashima   +8 more
openaire   +1 more source

Structure of the classical scrape-off layer of a tokamak

Plasma Physics and Controlled Fusion, 2018
Abstract The structure of the scrape-off layer (SOL) of a tokamak with little or no turbulent transport is analyzed. The analytical estimates of the density and electron temperature fall-off lengths of the SOL are put forward.
V Rozhansky, E Kaveeva, I Senichenkov, E Vekshina   +3 more
openaire   +1 more source

Influence of scrape-off layer on plasma confinement

Physics of Plasmas, 2011
The purpose of this paper is to discuss how plasma phenomena in the scrape-off layer (SOL) can affect the plasma density gradient at the separatrix and hence the plasma behavior inside the separatrix. The parallel flow loss rate and ionization rate in the SOL (related to the electron temperature and neutral gas density) affect the curvature of the ...
openaire   +1 more source