Zobrazeno 1 - 10
of 87
pro vyhledávání: '"Hudson, Stuart"'
Even if the magnetic field in a stellarator is integrable, phase-space integrability for energetic particle guiding center trajectories is not guaranteed. Both trapped and passing particle trajectories can experience convective losses, caused by wide
Externí odkaz:
http://arxiv.org/abs/2411.04289
Autor:
Tecchiolli, Zeno, Hudson, Stuart, Loizu, Joaquim, Köberl, Robert, Hindenlang, Florian, De Lucca, Brenno
A new approach for constructing polar-like boundary-conforming coordinates inside a toroid with strongly shaped cross-sections is presented. A coordinate mapping is obtained through a variational approach, which involves identifying extremal points o
Externí odkaz:
http://arxiv.org/abs/2405.08173
Optimising stellarators for quasisymmetry leads to strongly reduced collisional transport and energetic particle losses compared to unoptimised configurations. Though stellarators with precise quasisymmetry have been obtained in the past, it remains
Externí odkaz:
http://arxiv.org/abs/2404.02240
We present a novel numerical method for solving the anisotropic diffusion equation in magnetic fields confined to a periodic box which is accurate and provably stable. We derive energy estimates of the solution of the continuous initial boundary valu
Externí odkaz:
http://arxiv.org/abs/2306.00423
Publikováno v:
Plasma Phys. Control. Fusion 65 034008, 2023
Singular currents typically appear on rational surfaces in non-axisymmetric ideal magnetohydrodynamic equilibria with a continuum of nested flux surfaces and a continuous rotational transform. These currents have two components: a surface current (Di
Externí odkaz:
http://arxiv.org/abs/2303.02107
We solve the anisotropic diffusion equation in 2D, where the dominant direction of diffusion is defined by a vector field which does not conform to a Cartesian grid. Our method uses operator splitting to separate the diffusion perpendicular and paral
Externí odkaz:
http://arxiv.org/abs/2303.15447
Adjoint methods can speed up stellarator optimisation by providing gradient information more efficiently compared to finite-difference evaluations. Adjoint methods are herein applied to vacuum magnetic fields, with objective functions targeting quasi
Externí odkaz:
http://arxiv.org/abs/2108.11433
General three-dimensional toroidal ideal magnetohydrodynamic equilibria with a continuum of nested flux surfaces are susceptible to forming singular current sheets when resonant perturbations are applied. The presence of singular current sheets indic
Externí odkaz:
http://arxiv.org/abs/2108.09327
Publikováno v:
Journal of Plasma Physics, 88(1), 905880107 (2022)
Given the large anisotropy of transport processes in magnetized plasmas, the magnetic field structure can strongly impact heat diffusion: magnetic surfaces and cantori form barriers to transport while chaotic layers and island structures can degrade
Externí odkaz:
http://arxiv.org/abs/2108.06328
One common approach to computing the magnetic field produced by a filamentary current-carrying coil is to approximate the coil as a series of straight segments. The Biot-Savart field from each straight segment is known analytically. However, if the e
Externí odkaz:
http://arxiv.org/abs/2105.12522