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 +9 more
doaj +4 more sources
A promising approach to steady-state fusion: High-temperature superconducting strong-field stellarator with precise omnigenity [PDF]
The InnovationThe 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 +3 more
doaj +2 more sources
Critical gradient turbulence optimization toward a compact stellarator reactor concept
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 +5 more
doaj +1 more source
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 +2 more
doaj +1 more source
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 +5 more
doaj +1 more source
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 +6 more
doaj +1 more source
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 +8 more
doaj +1 more source
Identification of important error fields in stellarators using Hessian matrix method [PDF]
, 2019 Error fields are predominantly attributed to inevitable coil imperfections. Controlling error fields during coil fabrication and assembly is crucial for stellarators.
127313 +13 more
core +3 more sources
Optimization of flux-surface density variation in stellarator plasmas with respect to the transport of collisional impurities [PDF]
, 2019 Avoiding impurity accumulation is a requirement for steady-state stellarator operation. The accumulation of impurities can be heavily affected by variations in their density on the flux-surface.
Buller, Stefan +4 more
core +2 more sources
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 +3 more
doaj +1 more source