Results 21 to 30 of about 504,429 (107)
Exploration of the parameter space of piecewise omnigenous stellarator magnetic fields
Nuclear FusionPiecewise omnigenous fields are stellarator magnetic fields that are optimized with respect to radial neoclassical transport thanks to a second adiabatic invariant that is piecewisely constant on the flux-surface.
J.L. Velasco, E. Sánchez, I. Calvo
doaj +1 more source
Near-magnetic-axis geometry of a closely quasi-isodynamic stellarator [PDF]
Plasma Physics Reports, 2014 It is shown that the condition of stationary second adiabatic invariant at the magnetic axis of a stellarator configuration can be satisfied to good accuracy for all reflected particles.
Mikhailov, M. +2 more
openaire +2 more sources
Direct construction of low-aspect-ratio advanced stellarators via asymptotic expansion
Nuclear FusionAdvanced stellarators are promising candidates for fusion reactors due to their intrinsic steady-state operation capability and excellent plasma confinement properties.
Ke Liu +3 more
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Near-axis measures of quasi-isodynamic configurations
Journal of Plasma PhysicsWe present a number of measures and techniques to characterise and effectively construct quasi-isodynamic stellarators within the near-axis framework, without the need to resort to the computation of global equilibria. These include measures of the reliability of the model (including aspect-ratio limits and the appearance of ripple wells ...
Eduardo Rodríguez, Gabriel Plunk
openaire +3 more sources
UNIQUE FIXED POINT THEOREMS FOR CONTRACTIVE MAPS TYPE IN T 0 -QUASI-METRIC SPACES [PDF]
, 2014 In [2], Agyingi proved that every generalized contractive mapping defined in a q-spherically complete T 0 -ultra-quasi-metric space has a unique fixed point.
Yae ́ Ulrich Gaba
core +1 more source
A geometric approach to constructing quasi-isodynamic fields
Journal of Plasma PhysicsThe near-axis theory for quasi-isodynamic stellarator equilibria is reformulated in terms of geometric inputs to allow greater control of the ‘direct construction’ of quasi-isodynamic configurations and to facilitate understanding of the space of such equilibria. This includes a method to construct suitable magnetic axis curves by solving Frenet–Serret
Gabriel Plunk, Eduardo Rodríguez
openaire +2 more sources
Introducing isodynamic points for binary forms and their ratios
, 2022 The isodynamic points of a plane triangle are known to be the only pair of its centers invariant under the action of the Mobius group on the set of triangles.
Shapiro, Michael +2 more
core +1 more source
Nuclear FusionDesigning a fusion energy device to produce as much energy as possible requires balancing numerous physics constraints and metrics. In stellarators, the geometry is very flexible and involves a large number of free parameters.
R. Laia, R. Jorge, G. Abreu
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Nuclear FusionA four-field-period quasi-isodynamic stellarator configuration is presented that exhibits small neoclassical and electrostatic turbulent transport, good fast-ion confinement over a wide range of β values, small bootstrap current and an edge island ...
E. Sánchez +5 more
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Nonlinear simulations of core density collapses in large helical device
Nuclear FusionThe stability of ballooning modes at the plasma edge of Stellarator fusion reactors is a major concern, considered a severe limiting factor of the device performance, particularly for low magnetic shear configurations based on quasi-isodynamic symmetry ...
J. Varela +8 more
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