Results 251 to 260 of about 1,922,886 (290)

Model of a magnetic field in poloidal divertor tokamaks affected by resonant magnetic perturbations

Physics of Plasmas, 2009
A generic analytical model for the description of magnetic field lines in poloidal divertor tokamaks in the presence of external resonant magnetic perturbations is proposed.
S S Abdullaev
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Magnetic Island Formation in Coexisting System of Resonant Magnetic Perturbation and Perturbed Bootstrap Current

Journal of the Physical Society of Japan, 2019
A reduced two-fluid model describing the coexisting system of the resonant magnetic perturbations (RMPs) and plasma flows is extended to include an effect of the perturbed bootstrap current.
Seiya Nishimura, Ryusuke Numata
openaire   +1 more source

Screening of resonant magnetic perturbations by flows in tokamaks

Nuclear Fusion, 2012
Abstract The non-linear reduced four-field RMHD model in cylindrical geometry was extended to include plasma rotation, neoclassical poloidal viscosity and two fluid diamagnetic effects. Interaction of the static resonant magnetic perturbations (RMPs) with the rotating plasmas in tokamaks was studied.
M. Becoulet, F. Orain, P. Maget, N. Mellet, X. Garbet, E. Nardon, G.T.A. Huysmans, T. Casper, A. Loarte, P. Cahyna, A. Smolyakov, F.L. Waelbroeck, M. Schaffer, T. Evans, Y. Liang, O. Schmitz, M. Beurskens, V. Rozhansky, E. Kaveeva   +18 more
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Automatic detection of perturbed magnetic resonance signal

SPIE Proceedings, 2017
Magnetic resonance imaging (MRI) is widely used in medicine nowadays, yet a significant disadvantage is the amount of artifacts that affect the image during the acquisition process. This paper presents a strategy for automatic damage detection when the image is altered by movement or there is a loss of information due to magnetic susceptibility.
Jennifer Salguero, Nelson Velasco, Eduardo Romero C.   +2 more
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The interaction of resonant magnetic perturbations with rotating plasmas

Physics of Fluids B: Plasma Physics, 1991
The penetration of a helical magnetic perturbation into a rotating tokamak plasma is investigated. In the linear regime, it is found that unless the frequency of the imposed perturbation matches closely to one of the natural mode frequencies, reconnection at the rational surface is suppressed by a large factor.
R. Fitzpatrick, T. C. Hender
openaire   +1 more source

Shielding of resonant magnetic perturbations by rotation

Physics of Plasmas, 1996
Magnetic perturbations that drive islands are shielded from a rotating plasma by either a torque limit or an equilibrium limit. The physics of the shielding is given in a simple slab model along with the mechanism by which the shielding currents are maintained.
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Extended MHD simulation of resonant magnetic perturbations

Nuclear Fusion, 2009
Resonant magnetic perturbations (RMPs) have been found effective in suppressing edge localized modes (ELMs) in the DIII-D experiment (Evans et al 2006 Phys. Plasmas 13 056121, Moyer et al 2005 Phys. Plasmas 12 056119). Simulations with the M3D initial value code indicate that plasma rotation, due to an MHD toroidal
H.R. Strauss, L. Sugiyama, G.Y. Park, C.S. Chang, S. Ku, I. Joseph   +5 more
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Interaction between resonant magnetic perturbation and the rotating magnetic island

Physics of Plasmas, 1994
Nonlinear interaction between an external static resonant magnetic perturbation (RMP) and the corresponding rotating saturated magnetic island in tokamak plasma has been numerically simulated. The influence of flow shear driven by this nonlinear interaction is considered.
Wenjin Mao, Maoquan Wang
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Influence of the Resonant Magnetic Perturbation on the Plasma Boundary in DIII‐D

Contributions to Plasma Physics, 2010
AbstractStochastic boundaries in fusion devices have been investigated in tokamaks, stellarators and reversed field pinch experiments for many years. However, since edge localized modes (ELMs) have been successfully eliminated in H‐mode plasmas at the DIII‐D tokamak [1,2] with small, edge resonant magnetic perturbations, they have become a widely ...
Jakubowski, M., Evans, T., Fenstermacher, M., Lasnier, C., Schmitz, O., Wolf, R., Baylor, L., Boedo, J., Burrell, K., Frerichs, H., deGrassie, J., Gohil, P., Mordijck, S., Moyer, R., Leonard, A., Reiter, D., Samm, U., Schaffer, M., Osborne, T., Unterberg, E., Watkins, J.   +20 more
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Magnetic trapping caused by resonant perturbations in tokamaks with reversed magnetic shear

Physics of Plasmas, 2004
Reversed magnetic shear configurations in tokamaks reduce substantially particle diffusivity and improve plasma confinement due to the formation of a transport barrier, as a result of magnetic field line reconnection and bifurcation. The latter are caused by the resonant perturbation of an ergodic limiter on a tokamak with reversed magnetic shear ...
Marisa Roberto, Elton C. da Silva, Iberê L. Caldas, Ricardo L. Viana   +3 more
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