Results 31 to 40 of about 2,075 (173)

Dynamics of zonal flow-like structures in the edge of the TJ-II stellarator

, 2012
The dynamics of fluctuating electric field structures in the edge of the TJ-II stellarator, that display zonal flow-like traits, is studied. These structures have been shown to be global and affect particle transport dynamically [J.A. Alonso et al., Nucl.
Alonso J, B Ph Van Milligen, C Hidalgo, C Silva, D Carralero, Helander P, Hidalgo C, J A Alonso, J Arévalo, J L Velasco, M A Pedrosa, Motojima O, Pedrosa M A, Scott B, Tala T, Velasco J, Velasco J, Velasco J L Arévalo J Alonso J A, Wobig H, Wobig H, Xu Y   +20 more
core   +1 more source

Greedy permanent magnet optimization

Nuclear Fusion, 2023
A number of scientific fields rely on placing permanent magnets in order to produce a desired magnetic field. We have shown in recent work that the placement process can be formulated as sparse regression.
Alan A. Kaptanoglu, Rory Conlin, Matt Landreman   +2 more
doaj   +1 more source

Oscillatory relaxation of zonal flows in a multi-species stellarator plasma

, 2018
The low frequency oscillatory relaxation of zonal potential perturbations is studied numerically in the TJ-II stellarator (where it was experimentally detected for the first time).
Alonso, A., Calvo, I., Kleiber, R., Medina, F., Monreal, P., Sánchez, E., team, the TJ-II, Velasco, J. L.   +7 more
core   +1 more source

Global gyrokinetic simulations of ITG turbulence in the configuration space of the Wendelstein 7-X stellarator

, 2020
We study the effect of turbulent transport in different magnetic configurations of the Weldenstein 7-X stellarator. In particular, we performed direct numerical simulations with the global gyrokinetic code GENE-3D, modeling the behavior of Ion ...
Di Siena, A., Hindenlang, F., Jenko, F., Maurer, M., Merlo, G., Navarro, A. Bañón, Plunk, G. G., von Stechow, A., Wilms, F., Xanthopoulos, P.   +9 more
core   +1 more source

Anderson localization of ballooning modes, quantum chaos and the stability of compact quasiaxially symmetric stellarators [PDF]

, 2001
The radially local magnetohydrodynamic(MHD) ballooning stability of a compact, quasiaxially symmetric stellarator (QAS), is examined just above the ballooning beta limit with a method that can lead to estimates of global stability.
Anderson D. T., Beidler C., Dewar R. L., Hamberger S. M., J. Canik, J. L. Johnson, M. H. Redi, R. L. Dewar, S. Klasky, W. A. Cooper   +9 more
core   +2 more sources

Energetic particle transport in optimized stellarators

, 2021
18 pages, 10 figures, 1 ...
Bader, A, Anderson, D T, Drevlak, M, Faber, B J, Hegna, C C, Henneberg, S, Landreman, M, Schmitt, J C, Suzuki, Y, Ware, A   +9 more
openaire   +2 more sources

Simpler optimized stellarators using permanent magnets

Nuclear Fusion, 2022
Abstract A first-of-a-kind optimized stellarator for confining plasma has been designed and is being constructed with planar circular coils and permanent magnets composed of identical elements. The equilibrium is optimized to be quasi-axisymmetric for good particle confinement.
T. Qian, M. Zarnstorff, D. Bishop, A. Chamblis, A. Dominguez, C. Pagano, D. Patch, C. Zhu   +7 more
openaire   +1 more source

Heat Load Mitigation Studies in the W7‐X Stellarator Experiment

Contributions to Plasma Physics, EarlyView.
ABSTRACT During the experiments at the stellarator Wendelstein 7‐X (W7‐X) with fully water‐cooled plasma‐facing components (PFC), including carbon‐fiber composite (CFC) divertor targets with a thermal load capability of 10 MW/m2, high performance was achieved.
Dirk Naujoks, Amit Kharwandikar, Jasper Dettmar, Michael Endler, Joris Fellinger, Yu Gao, Joachim Geiger, Marcin Jakubowski, Thomas Sieber, Sebastian Thiede, Christian Voß, W7‐X Team   +11 more
wiley   +1 more source

Recent advances in stellarator optimization

Nuclear Fusion, 2017
Computational optimization has revolutionized the field of stellarator design. To date, optimizations have focused primarily on optimization of neoclassical confinement and ideal MHD stability, although limited optimization of other parameters has also been performed.
D.A. Gates, A.H. Boozer, T. Brown, J. Breslau, D. Curreli, M. Landreman, S.A. Lazerson, J. Lore, H. Mynick, G.H. Neilson, N. Pomphrey, P. Xanthopoulos, A. Zolfaghari   +12 more
openaire   +3 more sources

Magneto‐Thermal Assessment of Ferrofluid Flow in Corrugated Porous Domain With Rotating Cylinder for Nuclear Systems

International Journal of Energy Research, Volume 2026, Issue 1, 2026.
This research presents a novel approach by combining magnetohydrodynamic (MHD) flow with ohmic heating to investigate the conjugate mixed convective transport of ferrofluid in a discretely heated, smooth/wavy‐walled, square‐shaped porous compartment featuring a clockwise spinning cylindrical body positioned at various locations.
Nahid Hasan, Sumon Saha, Sreekala Cherkkarathandayan Karappan, Siam Abrar Saad, Hamza Faraji   +4 more
wiley   +1 more source