Results 1 to 10 of about 1,911,396 (184)

Critical gradient turbulence optimization toward a compact stellarator reactor concept [PDF]

Physical Review Research, 2023
Integrating turbulence into stellarator optimization is achieved by targeting the onset for the ion-temperature-gradient mode, highlighting effects of field line curvature, parallel connection length, local magnetic shear, and flux surface expansion. The
G. T. Roberg-Clark, G. G. Plunk, P. Xanthopoulos, C. Nührenberg, S. A. Henneberg, H. M. Smith   +5 more
doaj   +3 more sources

Confirmation of the topology of the Wendelstein 7-X magnetic field to better than 1:100,000 [PDF]

Nature Communications, 2016
Early stellarator designs suffered from high particle losses, an issue that can be addressed by optimization of the coils. Here the authors measure the magnetic field lines in the Wendelstein 7-X stellarator, confirming that the complicated design of the
T. Sunn Pedersen, M. Otte, S. Lazerson, P. Helander, S. Bozhenkov, C. Biedermann, T. Klinger, R. C. Wolf, H. -S. Bosch, The Wendelstein 7-X Team   +9 more
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A promising approach to steady-state fusion: High-temperature superconducting strong-field stellarator with precise omnigenity [PDF]

The Innovation
The stellarator has inherent advantages over the tokamak in achieving steady-state operation, especially due to its absence of disruptions and lack of need for current drive and the associated recirculating power.
Guosheng Xu, Zhiyuan Lu, Dehong Chen, Baonian Wan   +3 more
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Energetic particle optimization of quasi-axisymmetric stellarator equilibria

Nuclear Fusion, 2022
An important goal of stellarator optimization is to achieve good confinement of energetic particles such as, in the case of a reactor, alphas created by deuterium–tritium fusion. In this work, a fixed-boundary stellarator equilibrium was re-optimized for
Alexandra LeViness, John C. Schmitt, Samuel A. Lazerson, Aaron Bader, Benjamin J. Faber, Kenneth C. Hammond, David A. Gates   +6 more
doaj   +2 more sources

Coarse-grained gyrokinetics for the critical ion temperature gradient in stellarators

Physical Review Research, 2022
We present a modified gyrokinetic theory to predict the critical gradient that determines the linear onset of the ion temperature gradient (ITG) mode in stellarator plasmas.
G. T. Roberg-Clark, G. G. Plunk, P. Xanthopoulos   +2 more
doaj   +1 more source

Physics-regularized neural network of the ideal-MHD solution operator in Wendelstein 7-X configurations

Nuclear Fusion, 2023
The computational cost of constructing 3D magnetohydrodynamic (MHD) equilibria is one of the limiting factors in stellarator research and design. Although data-driven approaches have been proposed to provide fast 3D MHD equilibria, the accuracy with ...
Andrea Merlo, Daniel Böckenhoff, Jonathan Schilling, Samuel Aaron Lazerson, Thomas Sunn Pedersen, the W7-X Team   +5 more
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Stellarator coil optimization supporting multiple magnetic configurations

Nuclear Fusion, 2022
We present a technique that can be used to design stellarators with a high degree of experimental flexibility. For our purposes, flexibility is defined by the range of values the rotational transform can take on the magnetic axis of the vacuum field ...
Brandon F. Lee, Elizabeth J. Paul, Georg Stadler, Matt Landreman   +3 more
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Optimizing the HSX stellarator for microinstability by coil-current adjustments

Nuclear Fusion, 2023
The optimization of helically symmetric experiment (HSX) for reduced microinstability has been achieved by examining a large set of configurations within a neighborhood of the standard operating configuration.
M.J. Gerard, B. Geiger, M.J. Pueschel, A. Bader, C.C. Hegna, B.J. Faber, P.W. Terry, S.T.A. Kumar, J.C. Schmitt   +8 more
doaj   +1 more source

Robust stellarator optimization via flat mirror magnetic fields

Nuclear Fusion, 2023
Stellarator magnetic configurations need to be optimized in order to meet all the required properties of a fusion reactor. In this work, it is shown that a flat-mirror quasi-isodynamic (QI) configuration (i.e.
J.L. Velasco, I. Calvo, E. Sánchez, F.I. Parra   +3 more
doaj   +1 more source

A novel discontinuous-Galerkin deterministic neutronics model for fusion applications: workflow for stellarator reactor design studies

Nuclear Fusion
Stellarator reactor design and optimization requires quick and accurate neutronic simulations for obtaining tritium breeding ratio, coil neutron flux, and volumetric neutron heating.
Timo J. Bogaarts, Felix Warmer
doaj   +1 more source