Results 231 to 240 of about 48,929 (262)

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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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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Effect on confinement of edge-localized modes in TCV

Plasma Physics and Controlled Fusion, 1996
The effect of ELMs on confinement in ohmic H-modes has been investigated by analysing the rates of change of global parameters such as the electron content and the stored energy as a function of ELM frequency. In double-null H-modes, ELMs are found to expel on average 2% of the electron content and 2.5% of the stored energy.
Weisen, H., Dutch, M. J., Hofmann, F., Martin, Y., Moret, J. M., Nieswand, C., Pietrzyk, Z. A., Pitts, R. A., Pochelon, A.   +8 more
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Shear flows at the tokamak edge and their interaction with edge-localized modes

Physics of Plasmas, 2007
Shear flows in the scrape-off layer (SOL) and the edge pedestal region of tokamaks are shown to arise naturally out of transport processes in a magnetohydrodynamic model. In quasi-steady-state conditions, collisional resistivity coupled with a simple bootstrap current model necessarily leads to poloidal and toroidal flows, mainly localized to the edge ...
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Intrinsic localized anharmonic modes at surfaces and edges

Physica B: Condensed Matter, 1996
Abstract On the basis of realistic lattice-dynamical models, anharmonic modes have been found at surfaces and edges of crystal lattices. Their associated displacements are not only localized in the direction(s) perpendicular, but also parallel to the surface or the tip of the edge. The stability of such modes is tested by molecular dynamics.
U. Schröder, D. Bonart, A.P. Mayer
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Edge localized vibration modes on a rectangular ridge

Journal of Applied Physics, 1977
We present a theory of elastic waves which propagate along a semi-infinite rectangular ridge made up of a nonpiezoelectric elastic medium, and which are localized at the top and sides of the ridge. Stress-free boundary conditions are incorporated into the calculation by the assumption of position-dependent elastic moduli. The equations of motion of the
A. A. Maradudin, K. R. Subbaswamy
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Effect of resistivity on small edge localized mode

Physics of Plasmas, 2018
The effect of resistivity on small edge localized mode (ELM) is investigated based on the peeling-ballooning three-field module of BOUT++. The ELM size increases with increasing resistivity, which is attributed to both linear growth rate and turbulence intensity.
N. Wu, S. Y. Chen, M. L. Mou, C. J. Tang
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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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Effects of hyper-resistivity on edge localized modes

Plasma Physics and Controlled Fusion
Abstract The effects of hyper-resistivity induced by anomalous electron viscosity on edge localized modes (ELMs) are systematically investigated using the ELM-PB model in BOUT++ simulation code. Our previous theoretical work [S Y Chen et al, Plasma Phys. Control.
T Q Liu, M L Mou, S Y Chen, Y M Zhang, X Lu, T Y Wang, C J Tang   +6 more
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Density edge localized modes in rotating plasmas

Nuclear Fusion, 1996
A linear analysis is presented for the density edge localized mode with realistic tokamak edge plasma and electric field profiles. The mode is driven unstable by the electron temperature gradient and is localized by the density pedestal, with a radial mode width proportional to the square root of the density scale length (in H mode).
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