Results 231 to 240 of about 2,944 (263)

Scrape-off layer tokamak plasma turbulence

Physics of Plasmas, 2012
Two-dimensional (2D) interchange turbulence in the scrape-off layer of tokamak plasmas and their subsequent contribution to anomalous plasma transport has been studied in recent years using electron continuity, current balance, and electron energy equations.
N. Bisai, R. Singh, P. K. Kaw
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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
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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 ...
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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
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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
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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.
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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.
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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
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Measurement of flow in the scrape-off layer of TdeV

Journal of Nuclear Materials, 1992
Two techniques are used to monitor the flow in the scrape-off layer of Tokamak de Varennes (TdeV); one is based on a new multipin Langmuir/Mach probe called Gundestrup while the other depends on the measurement of the upstream/downstream asymmetry of the power absorbed by a test limiter inserted into the plasma edge. Gundestrup has been used to measure
C.S. MacLatchy, C. Boucher, D.A. Poirier, J.P. Gunn, B.L. Stansfield, W.W. Zuzak   +5 more
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The fine structure of ELMs in the scrape-off layer

Plasma Physics and Controlled Fusion, 2005
Edge-localized modes (ELMs) have been observed by diagnostic systems with high spatial and temporal resolution in the ASDEX and JET tokamaks. During the ELMs, substructures exist in the scrape-off layer (SOL) with sizes of 2?5?cm and lifetimes of the order of 20?50??s. Their poloidal?temporal evolution is directly observed, and the radial transport due
M Endler, I García-Cortés, C Hidalgo, G F Matthews, ASDEX Team, JET Team   +5 more
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