Results 121 to 130 of about 52,799 (163)
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Characteristics of edge localized modes in ASDEX Upgrade
Plasma Physics and Controlled Fusion, 1996Characteristics 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 +7 more
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Intrinsic Localized Anharmonic Modes at Crystal Edges
Physical Review Letters, 1995Using a realistic lattice-dynamical model for a diatomic crystal, time-periodic anharmonic vibrations have been found with displacement pattern localized at an edge of the crystal. The localization is not only in the direction normal, but also in the directions parallel to the edge along which the lattice is periodic.
, Bonart, , Mayer, , Schröder
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Model for Current-Driven Edge-Localized Modes
Physical Review Letters, 2006Edge-localized modes (ELMs) are cyclic disturbances in the outer region of tokamak plasmas that are influential in determining present and future tokamak performance. In this Letter, we outline an approach to modeling ELMs in which we envisage toroidal peeling modes initiating a Taylor relaxation [Phys. Rev. Lett.
C G, Gimblett, R J, Hastie, P, Helander
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Edge-localized modes and edge transport in spherical tokamaks
Physics of Plasmas, 2005Turbulent energy transport in numerical simulations of the edge region of spherical tokamaks with small toroidal aspect ratio A=1.5 is directly compared to that in conventional tokamaks with larger aspect ratio A=3. Depending upon the aspect ratio of the torus, the energy flux can vary greatly.
Robert G. Kleva, Parvez N. Guzdar
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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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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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Studies of edge localized modes on ASDEX
Nuclear Fusion, 1992The 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 +6 more
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Edge Localized Modes in Tokamaks
Fusion Science and Technology, 2012As 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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Magnetohydrodynamic activity during edge localized modes on ASDEX
Nuclear Fusion, 1990Magnetohydrodynamic (MHD) activity during edge localized modes (ELMs) has been monitored in the ASDEX tokamak. Besides a fast inward shift of the plasma column, a helical MHD perturbation has been found to accompany ELMs. For the discharges investigated, the helical instability has a poloidal mode number m of 3 or 4 and a toroidal mode number n of 1 ...
Von Goeler, S. +4 more
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Characteristics of the edge localized mode in the JFT-2M H-mode
Nuclear Fusion, 1991The characteristics of the edge localized model (ELM), also referred to as edge relaxation phenomenon, were investigated in H-mode plasmas of JFT-2M. It was found that the ELM is mainly a density fluctuation phenomenon at the edge and that the electron temperature at the edge, except near the separatrix, is not very strongly perturbed.
H. Matsumoto +21 more
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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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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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