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 +5 more
doaj +2 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 +9 more
doaj +2 more sources
Impurity Transport in a Mixed-Collisionality Stellarator Plasma [PDF]
Physical Review Letters, 2017 A potential threat to the performance of magnetically confined fusion plasmas is the problem of impurity accumulation, which causes the concentration of highly charged impurity ions to rise uncontrollably in the center of the plasma and spoil the energy ...
Per Helander, Albert Mollén
exaly +3 more sources
First Observation of a Stable Highly Dissipative Divertor Plasma Regime on the Wendelstein 7-X Stellarator [PDF]
Physical Review Letters, 2019 Daihong Zhang, Ralf König, Yuhe Feng
exaly +3 more sources
Kinetic simulations of scrape-off layer physics in the DIII-D tokamak
Nuclear Materials and Energy, 2017 Simulations using the fully kinetic code XGCa were undertaken to explore the impact of kinetic effects on scrape-off layer (SOL) physics in DIII-D H-mode plasmas.
R.M. Churchill +7 more
doaj +1 more source
Simulating Gyrokinetic Microinstabilities in Stellarator Geometry with GS2 [PDF]
, 2011 The nonlinear gyrokinetic code GS2 has been extended to treat non-axisymmetric stellarator geometry. Electromagnetic perturbations and multiple trapped particle regions are allowed.
Beidler C. +11 more
core +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
Gyrokinetic studies of the effect of beta on drift-wave stability in NCSX [PDF]
, 2012 The gyrokinetic turbulence code GS2 was used to investigate the effects of plasma beta on linear, collisionless ion temperature gradient (ITG) modes and trapped electron modes (TEM) in National Compact Stellarator Experiment (NCSX) geometry.
Baumgaertel, J. A. +4 more
core +3 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 +2 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