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Quasi-Isodynamic Stellarators with Low Turbulence as Fusion Reactor Candidates
PRX EnergyThe stellarator is a type of fusion energy device that—if properly designed—could provide clean, safe, and abundant energy to the grid. To generate this energy, a stellarator must keep a hot mixture of charged particles (known as a plasma) sufficiently ...
Alan G. Goodman +9 more
doaj +7 more sources
A quasi-isodynamic configuration with good confinement of fast ions at low plasma β
Nuclear Fusion, 2023 A new quasi-isodynamic (QI) stellarator configuration optimized for the confinement of energetic ions at low plasma β is obtained. The numerical optimization is carried out using the STELLOPT suite of codes.
E. Sánchez +3 more
doaj +3 more sources
Trapped electron mode in a quasi-isodynamic stellarator
Nuclear FusionGlobal gyrokinetic simulations find a strongly unstable trapped electron mode excited by a density gradient in a quasi-isodynamic stellarator. The eigenmode structure localizes on the inner side of the torus with an unfavorable magnetic curvature and ...
Javier H. Nicolau +4 more
doaj +3 more sources
Statistical Analysis of Plasma Dynamics in Gyrokinetic Simulations of Stellarator Turbulence [PDF]
Entropy, 2023 A geometrical method for assessing stochastic processes in plasma turbulence is investigated in this study. The thermodynamic length methodology allows using a Riemannian metric on the phase space; thus, distances between thermodynamic states can be ...
Aristeides D. Papadopoulos +4 more
doaj +2 more sources
Resilience of Quasi-Isodynamic Stellarators against Trapped-Particle Instabilities [PDF]
Physical Review Letters, 2012 It is shown that in perfectly quasi-isodynamic stellarators, trapped particles with a bounce frequency much higher than the frequency of the instability are stabilizing in the electrostatic and collisionless limit. The collisionless trapped-particle instability is therefore stable as well as the ordinary electron-density-gradient-driven trapped ...
Per Helander
exaly +7 more sources
Constructing precisely quasi-isodynamic magnetic fields
Journal of Plasma Physics, 2022 We present a novel method for numerically finding quasi-isodynamic stellarator magnetic fields with excellent fast-particle confinement and extremely small neoclassical transport.
Goodman, Alan +8 more
core +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
AIP Advances, 2022 In future fusion reactors, the confinement of α-particles is a crucial issue. The perfect omnigenity may be difficult to achieve in the quasi-isodynamic and quasi-symmetric stellarators when a multi-objective optimization is considered.
Yichao Zhang +12 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 +3 more
doaj +1 more source
Collisionless microinstabilities in stellarators II - numerical simulations [PDF]
, 2013 Microinstabilities exhibit a rich variety of behavior in stellarators due to the many degrees of freedom in the magnetic geometry. It has recently been found that certain stellarators (quasi-isodynamic ones with maximum-$J$ geometry) are partly resilient
Helander, P. +2 more
core +1 more source