Results 251 to 260 of about 266,197 (292)

Edge localized modes (ELMs)

Plasma Physics and Controlled Fusion, 1996
The phenomenology of edge localized modes (ELMs), an MHD instability occurring in the edge of H-mode plasmas in toroidal magnetic fusion experiments, is described. ELMs are important to obtain experimental control of the particle inventory of fusion plasmas.
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Edge localized modes control: experiment and theory

Journal of Nuclear Materials, 2005
The paper reviews recent theoretical and experimental results focussing on the identification of the key factors controlling ELM energy and particle losses both in natural ELMs and in the presence of external controlling mechanisms. Present experiment and theory pointed out the benefit of the high plasma shaping, high q(95) and high pedestal density in
Becoulet, M., Huysmans, G., Thomas, P., Joffrin, E., Rimini, F., Monier-Garbet, P., Grosman, A., Ghendrih, P., Parail, V., Lomas, P., Matthews, G., Wilson, H., Gryaznevich, M., Counsell, G., Loarte, A., Saibene, G., Sartori, R., Leonard, A., Snyder, P., Evans, T., Moyer, R., Gohil, P., Moyer, R., Kamada, Y., Oyama, N., Hatae, T., Kamiya, K., Degeling, A., Martin, Y., Lister, J., Rapp, J., Perez, C., Lang, P., Chankin, A., Eich, T., Sips, A., Stober, J., Horton, L., Kallenbach, A., Suttrop, W., Saarelma, S., Cowley, S., Lönnroth, J., Shimada, M., Polevoi, A., Federici, G.   +45 more
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Edge Localized Modes in Tokamaks

Fusion Science and Technology, 2012
As one increases the heating power in a tokamak beyond a threshold, the confinement undergoes a bifurcation, with a dramatic increase in the confinement time by a factor ~2.
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Insights into type‐I edge localized modes and edge localized mode control from JOREK non‐linear magneto‐hydrodynamic simulations

Contributions to Plasma Physics, 2018
Edge localized modes (ELMs) are repetitive instabilities driven by the large pressure gradients and current densities in the edge of H‐mode plasmas. Type‐I ELMs lead to a fast collapse of the H‐mode pedestal within several hundred microseconds to a few milliseconds.
Hoelzl, M., Huijsmans, G.T. A., Orain, F., Artola, F.J., Pamela, S., Becoulet, M., van Vugt, D., Liu, F., Futatani, S., Vanovac, B., Lessig, A., Wolfrum, E., Mink, F., Trier, E., Dunne, M., Viezzer, E., Eich, T., Frassinetti, L., Gunter, S., Lackner, K., Krebs, I., Team, ASDEXUpgrade, EUROfusion MST1 Team,   +22 more
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Studies of edge localized modes on ASDEX

Nuclear Fusion, 1992
The MHD behaviour connected with edge localized modes (ELMs) is studied using fast sample rate fluctuation diagnostics. It is found that ELMs on ASDEX are generally preceded by a coherent MHD mode of medium poloidal mode number (m=10-15). At the onset of the ELM the mode behaviour changes to a turbulent one, leading to an outflux of heat and particles.
Zohm, Hartmut, Wagner, F., Endler, M., Gernhardt, J., Holzhauer, E., Kerner, W., Mertens, V.   +6 more
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Edge-localized modes - physics and theory

Plasma Physics and Controlled Fusion, 1998
The phenomenology of ELMs is reviewed, emphasizing the conditions for their occurrence, their repetition frequencies, their impact on confinement and the properties of associated fluctuations, in order to understand the physics involved. Theories of ELMs are then briefly described and the extent to which they can successfully model ELMs is discussed.
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Nonlinear magnetohydrodynamics of edge localized mode precursors

Physics of Plasmas, 2015
A possible origin of edge-localized-mode (ELM) precursors based on nonlinear ideal peeling-ballooning mode is reported. Via nonlinear variational principle, a nonlinear evolution equation of the radial displacement is derived and solved, analytically.
Z. B. Guo, Lu Wang, X. G. Wang
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Edge Localized Mode (ELM)

2014
The next generation of fusion machines like ITER and DEMO will need a reliable method for controlling the periodic transient expulsion of a considerable amount of energy onto the plasma-facing components caused by instabilities at the plasma edge. The good plasma confinement in these tokamak devices will result in a steepened pressure profile at the ...
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Characteristics of edge localized modes in ASDEX Upgrade

Plasma Physics and Controlled Fusion, 1996
Characteristics of the various types of edge localized modes (ELMs) observed during the H-mode of the ASDEX Upgrade tokamak are presented. Magnetic high-mode-number ELM precursor activity is found for type I ELMs and type III ELMs, the former only during neutral beam injection in the counter direction.
W Suttrop, K Büchl, H J de Blank, J Schweinzer, H Zohm, ASDEX Upgrade team, NBI group, ICRH group   +7 more
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Edge-localized mode simulations in divertor tokamaks

Physics of Plasmas, 1996
The three-dimensional nonlinear evolution of moderate wavelength pressure-driven edge-localized instabilities is calculated in divertor tokamaks. The evolution consists of several stages: linear growth, nonlinear saturation and turbulence, shear flow generation, pressure outflow to the outboard divertor, and finally, outflow to the inboard divertor ...
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