Results 211 to 220 of about 8,268 (229)

Slow Thermal Waves in Impurity Seeded Radiative Plasmas

Physical Review Letters, 1996
Linear and nonlinear wave propagation in optically thin, impurity seeded radiative plasmas is studied in slab geometry. Taking into account the thermal force that acts on impurity ions leads to a new type of slightly damped or slightly unstable subsonic waves that propagate within limited ranges of temperature.
, Morozov, , Herrera
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An impurity seeded radiative mantle for ITER

Nuclear Fusion, 1995
Self-consistent, coupled transport/MHD/scrape-off layer (SOL) divertor calculations indicate that a stable, radiating mantle can be maintained just inside the separatrix by iron impurity injection into the SOL in an ITER EDA model. The power flux to the divertor plate is reduced thereby by an order of magnitude or more.
J Mandrekas, Jr. W.M Stacey
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Impurity seeded radiative power exhaust solutions for ITER

Nuclear Fusion, 1996
The injection of impurities into the scrape-off layer (SOL) to stimulate radiative power exhaust from the mantle and SOL/divertor of the International Thermonuclear Experimental Reactor (ITER) is investigated. Intermediate Z impurities (e.g. argon to krypton) are able to radiate more than two thirds of the plasma heating power, without significant ...
J Mandrekas, W.M Stacey, F Kelly
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TECXY simulations of multi‐species impurity seeding in DEMO reactor

Contributions to Plasma Physics, 2018
Numerical studies have been performed to investigate the influence of the few impurity species on the heat load reduction and the SOL plasma parameters in the European DEMO reactor. Two‐dimensional multi‐fluid TECXY code has been used to model edge plasma transport described by the classical set of transport equations of multi‐species plasma derived by
Chmielewski, P., Zagórski, R., Ivanova‐Stanik, I., Pericolli, V.R.   +3 more
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Cyclic auto-seeded polythermal preferential crystallization—Effect of impurity accumulation

Chemical Engineering and Processing: Process Intensification, 2010
Abstract Preferential crystallization is a crystallization process where two enantiomers are separated into the pure chiral species. Usually the process is operated in a cyclic mode crystallizing the two species in sequel batches with an intermediate addition of fresh racemate. In this cyclic scheme reproducibility is a key issue.
Czapla, F., Polenske, D., Klukas, L., Lorenz, H., Seidel-Morgenstern, A.   +4 more
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Reduced Models of Impurity Seeded Edge Plasmas

Contributions to Plasma Physics, 2008
AbstractThe reduced descriptions of the distribution of impurities over ionization states, radiation losses and plasma dynamics are reviewed. Two and three most important ion approximation for light impurities and continuous descriptions of heavy impurities are discussed. Reduced descriptions of atomic processes like ionization, photo‐ and dielectronic
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Divertor power spreading in DEMO reactor by impurity seeding

Fusion Engineering and Design, 2016
Abstract Numerical simulation with COREDIV code of DEMO H-mode discharges (tungsten divertor and wall) are performed considering the influence of seeding impurities with different atomic numbers: Ne, Ar and Kr on the DEMO scenarios. The approach is based on integrated numerical modeling using the COREDIV code, which self-consistently solves radial ...
Zagórski, Roman, Gałązka, Krzysztof, Ivanova-Stanik, Irena   +2 more
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Impurity-seeded plasma experiments on JET

2003
Scaling to larger tokamaks of high confinement plasmas with radiating edges, induced by impurities, is being studied through internationally collaborative experiments on JET. In campaigns till the end of 2000, three different regimes have been explored. A small number of limiter L-mode discharges seeded with neon have most closely repeated the approach
Maddison, G.P., von Hellermann, M., et al.,, Ingesson, L.C.   +3 more
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Radiated power distributions in impurity-seeded plasmas in LHD

Journal of Nuclear Materials, 2015
Abstract In LHD, impurity seeding has been performed to enhance the radiative cooling in the edge region. Neon, nitrogen and argon were seeded by gas puffing, and the behaviour of those impurities in the plasma was investigated with the innovative diagnostic method.
T. Morisaki, K. Oyama, N. Tamura, S. Masuzaki, T. Akiyama, G. Motojima, J. Miyazawa, B.J. Peterson, N. Ohno, H. Yamada   +9 more
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Impurity Seeding with Dust Injection in Tokamak Edge Plasmas

Contributions to Plasma Physics, 2012
AbstractImpurity seeding of tokamak edge plasmas in the form of dust is modeled using the recently coupled DUSTT/UEDGE code. The effects on edge plasma performance due to lithium and carbon dust continuously injected at different poloidal locations in NSTX and ITER are modeled.
R.D. Smirnov, S.I. Krasheninnikov, A.Yu. Pigarov, T.D. Rognlien, D.K. Mansfield, C.H. Skinner, A.L. Roquemore   +6 more
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