Results 261 to 270 of about 3,423,360 (305)

On defining scrape-off layer widths

Plasma Physics and Controlled Fusion, 1999
A physically motivated, theoretical basis for defining scrape-off layer (SOL) widths is proposed. Applying it to theoretical models proposed for transport in the SOL shows how the width is affected by the form of the cross-field transport and the parallel transport to target plates. For a cross-field diffusivity and a parallel loss time , the estimate
J W Connor, P Helander
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Kinetic Effects in the Scrape Off Layer

Contributions to Plasma Physics, 1992
AbstractThe scrape off layer (SOL) of a confined plasma (Fig. 1a) is in many respects in a state far from, thermodynamic equilibrium: The energy diffusing outward from the plasma core across the separatrix is condensed in the thin SOL to a strong energy flux along the magnetic field.
openaire   +2 more sources

Modelling of the impurity pumping by a tokamak scrape-off layer

Journal of Nuclear Materials, 1984
Abstract The impurity flow along magnetic field lines in a collisional tokamak scrape-off layer is numerically investigated using a testfluid approach. Transport perpendicular to the magnetic field is approximately included by a local loss time constant τ⊥. Results for various impurities and hydrogen background plasma parameters show the significance
Neuhauser, J., Schneider, W., Wunderlich, R., Lackner, K., Behringer, K.   +4 more
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Scrape-off layer reflectometer for Alcator C-Mod

Review of Scientific Instruments, 2008
A two-frequency x-mode reflectometer operating from 100 to 146 GHz is deployed on Alcator C-Mod to measure the density profile and fluctuations in the scrape-off layer (SOL) immediately in front of the new J-port ICRF antenna and the new C-port lower hybrid launcher. The reflectometer covers densities from 1016 to 1020 m−3 at 5–5.4 T.
G R, Hanson, J B, Wilgen, C, Lau, Y, Lin, G M, Wallace, S J, Wukitch   +5 more
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Theory of the scrape-off layer for arbitrary collisionality

Journal of Nuclear Materials, 1980
Abstract A two-dimensional analysis of the plasma boundary in a tokamak with any given set of toroidal target plates (as in a poloidal divertor or in a toroidal limiter system) is presented. The related boundary value problem for the drift kinetic equation of plasma ions with arbitrary collisionality is converted into a Hilbert problem for several ...
openaire   +2 more sources

Characterisation of the scrape-off layer plasma in the FTU tokamak

Journal of Nuclear Materials, 1995
Abstract The average values of the scrape-off layer (SOL) plasma quantities of FTU, density, temperature, e-folding lengths are studied as a function of the main plasma parameters and satisfactorily compared with 2D model predictions. The cause of their poloidal asymmetry is investigated and attributed to the variation of the magnetic line connection
Ridolfini, Vp, Zagorski, R, Crisanti, F, Granucci, G, Mazzitelli, G, Pieroni, L, ROMANELLI, FRANCESCO   +6 more
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Scrape-off layer reflectometer for Alcator C-Mod

Review of Scientific Instruments, 2010
A swept-frequency X-mode reflectometer is being built for Alcator C-Mod to measure the scrape-off layer density profiles at the top, middle, and bottom locations in front of both the new lower hybrid launcher and the new ion cyclotron range of frequencies antenna.
Cornwall, Lau, Greg, Hanson, John, Wilgen, Yijun, Lin, Steve, Wukitch   +4 more
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Study of the Ionization Rate in the Scrape-Off Layer

Contributions To Plasma Physics, 2004
AbstractThe purpose of this work is to study the effect of multi‐step ionization on the tokamak scrape‐of layer (SOL). Using particle‐in‐cell (PIC) simulations we show that this effect strongly influences the divertor plasma. Our results suggest that, at least for high‐recycling regimes, multi‐step ionization should necessarily be included in SOL ...
Siegbert Kuhn, David Tskhakaya
exaly   +2 more sources

Dynamics of Impurities in the Scrape‐Off Layer

Contributions to Plasma Physics, 1988
AbstractImpurity modelling of the Scrape‐Off Layer, SOL, is reviewed. Simple analytic models are sometimes adequate for relating central impurity levels to edge plasma conditions and for explaining the patterns of net erosion/deposition found on limiters. More sophisticated approaches, which are also necessary, are categorized and reviewed.
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Modeling of supersonic plasma flow in the scrape-off layer

Journal of Computational Physics, 2007
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Oleksandr Marchuk, Mikhail Z. Tokar
openaire   +2 more sources