Results 231 to 240 of about 3,138 (265)

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

Magnetic field topology modeling under resonant magnetic perturbations on EAST

Plasma Science and Technology, 2019
In order to understand the mechanism by which the resonant magnetic perturbation (RMP) mitigates or suppresses the edge-localized mode (ELM), the topological study of the edge magnetic field in ELM mitigation or suppression phase is a critical issue.
Jie HUANG, Yasuhiro SUZUKI, Yunfeng LIANG, Manni JIA, Youwen SUN, Nan CHU, Jichan XU, Muquan WU   +7 more
openaire   +1 more source

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
openaire   +1 more source

Influence of resonant magnetic perturbations on plasma edge turbulence

Physics of Plasmas, 1997
This work reports alterations on plasma-edge equilibrium profiles and on edge turbulence, and anomalous transport induced by resonant perturbing magnetic fields in the TBR (Brazilian Tokamak) tokamak [J. Fusion Energy 12, 295 (1993)]. Thus, these perturbations have reduced the equilibrium parameters and the spectral power of the fluctuations and ...
R. M. Castro, M. V. A. P. Heller, I. L. Caldas, Z. A. Brası́lio, R. P. da Silva, I. C. Nascimento   +5 more
openaire   +1 more source

ELM suppression by resonant magnetic perturbations at DIII-D

2009 23rd IEEE/NPSS Symposium on Fusion Engineering, 2009
Edge localized mode (ELM) suppression by resonant magnetic perturbations (RMPs) is being studied at DIII-D with ITER-similar plasma shapes and edge collisionalities. Suppression at low collisionality correlates with overlap of vacuum magnetic field islands in a quantified edge layer at moderate q.
M.J. Schaffer, T.E. Evans, R.A. Moyer, M.E. Fenstermacher   +3 more
openaire   +1 more source

Edge localized modes control by resonant magnetic perturbations

Journal of Nuclear Materials, 2007
A number of designs for external or in-vessel coils generating Resonant Magnetic Perturbations (RMPs) for type I ELMs control in ITER are analyzed. The RMPs generated by the I-coils in the successful DIII-D ELMs control experiments are taken as a reference. The three ITER characteristic scenarios (H-mode, hybrid and steady-state) are studied.
E. Nardon, M. Bécoulet, G. Huysmans, O. Czarny, P.R. Thomas, M. Lipa, R.A. Moyer, T.E. Evans, G. Federici, Y. Gribov, A. Polevoi, G. Saibene, A. Portone, A. Loarte   +13 more
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Influence of resonant magnetic perturbation on a rotating helical plasma

Plasma Physics and Controlled Fusion, 2012
Nonlinear stability of magnetic islands in a helical plasma with resonant magnetic perturbation (RMP) is investigated using reduced magnetohydrodynamic equations including neoclassical viscosity. Coexistence of RMP-driven islands and the resistive interchange mode is numerically simulated.
S Nishimura, S Toda, Y Narushima, M Yagi
openaire   +1 more source