6 citations · 12 across the 13 of their papers we have counts for
14 papers
Theory of Equivalent Tokamaks for Characterizing Turbulent Transport in Quasi-symmetric Stellarators
Hongxuan Zhu, R. Gaur, X. Wei +2
It is well known that quasi-symmetric (QS) stellarators are isomorphic to tokamaks in terms of their neoclassical-transport properties, and the corresponding transport coefficients…
Symmetry-agnostic stellarators for collisionless confinement
W. Sengupta, A. Bhattacharjee, S. Buller
Quasisymmetry, omnigenity and piecewise omnigenity confine trapped particles by making the bounce action independent of the field-line label. Recent optimizations produce mixed-sym…
Compact quasiaxisymmetric stellarators, a near axisymmetric theory
Wrick Sengupta, Rogerio Jorge, Nikita Nikulsin +4
We develop a theory of ridges in compact stellarators with quasiaxisymmetry (QA). The equilibrium with finite plasma currents and pressure is modeled by ideal magnetohydrostatics (…
The Geometry of Flux Surfaces with Quasi-Poloidal Symmetry
Rishin Madan, Wrick Sengupta, Elizabeth J. Paul +4
Quasi-poloidal (QP) magnetic fields have desirable properties for confining plasma: no radial drift of guiding centres (with positive implications for neoclassical transport), zero…
Periodic Korteweg-de Vries soliton potentials generate quasisymmetric magnetic field strength in a finite plasma-beta equilibrium
W. Sengupta, R. Madan, S. Buller +6
Quasisymmetry (QS) is a hidden symmetry of the magnetic field strength, B, that enables effective confinement of charged particles in a fully three-dimensional (3D) toroidal plasma…
Numerical asymptotics of near-axis expansions of quasisymmetric magnetohydrostatic equilibria with anisotropic pressure
Lanke Fu, Eduardo Rodriguez, Rory Conlin +1
Quasisymmetry (QS) is a property of special magnetic configurations, where the magnetic field strength, but not necessarily the full vector field, has a direction of symmetry. QS l…
A class of high-beta, large-aspect-ratio quasiaxisymmetric Palumbo-like configurations
Andrew Brown, Wrick Sengupta, Nikita Nikulsin +1
The space of high-beta, approximately quasiaxisymmetric, large-aspect-ratio stellarator configurations is explored using an inverse coordinate approach and a quadratic polynomial a…
A Grad-Shafranov model for compact quasisymmetric stellarators
Nikita Nikulsin, Wrick Sengupta, Stefan Buller +1
A Grad-Shafranov equation (GSE) valid for compact quasisymmetric stellarators is derived by an asymptotic expansion around a vacuum field carried to first order. We obtain an equat…
Global Stellarator Coil Optimization with Quadratic Constraints and Objectives
Lanke Fu, Elizabeth J. Paul, Alan A. Kaptanoglu +1
Most present stellarator designs are produced by costly two-stage optimization: the first for an optimized equilibrium, and the second for a coil design reproducing its magnetic co…
Collisionless zonal-flow dynamics in quasisymmetric stellarators
Hongxuan Zhu, Z. Lin, A. Bhattacharjee
The linear collisionless plasma response to a zonal-density perturbation in quasisymmetric stellarators is studied, including the geodesic-acoustic-mode oscillations and the Rosenb…
Exploration of the parameter space of quasisymmetric stellarator vacuum fields through adjoint optimisation
Richard Nies, Elizabeth J. Paul, Dario Panici +2
Optimising stellarators for quasisymmetry leads to strongly reduced collisional transport and energetic particle losses compared to unoptimised configurations. Though stellarators…
An asymptotic Grad-Shafranov equation for quasisymmetric stellarators
Nikita Nikulsin, Wrick Sengupta, Rogerio Jorge +1
A first-order model is derived for quasisymmetric stellarators where the vacuum field due to coils is dominant, but plasma-current-induced terms are not negligible and can contribu…
Asymptotic quasisymmetric high-beta 3D MHD equilibria near axisymmetry
W. Sengupta, N. Nikulsin, R. Gaur +1
Quasisymmetry (QS), a hidden symmetry of the magnetic field strength, is known to support nested flux surfaces and provide superior particle confinement in stellarators. In this wo…
Periodic Korteweg-de Vries soliton potentials generate quasisymmetric magnetic fields
W. Sengupta, N. Nikulsin, S. Buller +6
Quasisymmetry (QS) is a hidden symmetry of the magnetic field strength, B, that effectively confines charged particles in a three-dimensional toroidal plasma equilibrium. Here, we…