Publication

Diamagnetic drift stabilized ballooning modes in a 3D heliotron

Wilfred Anthony Cooper, Ben McMillan
2012
Journal Articles

Résumé

An analysis of kinetic ballooning modes is presented, ray trajectories for the inward shifted Large Helical Device configuration at modest $$ and with an anisotropic pressure profile due to the hot particles are evaluated and an estimate of the marginal stability is computed using the Weyl formula. The Weyl formula indicates that the finite diamagnetic drifts of the hot particles displaces the minimum phase space volume to lower frequencies; however, its magnitude is higher than when these drift effects are ignored.

Source officielle

https://infoscience.epfl.ch/entities/publication/d6e4de59-3ca7-4495-87f2-b8831dfdaade

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Wilfred Anthony Cooper, Ben McMillan
2012
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/d6e4de59-3ca7-4495-87f2-b8831dfdaade

À propos de ce résultat

Concepts associés (4)

Plasma stability

The stability of a plasma is an important consideration in the study of plasma physics. When a system containing a plasma is at equilibrium, it is possible for certain parts of the plasma to be disturbed by small perturbative forces acting on it. The stability of the system determines if the perturbations will grow, oscillate, or be damped out. In many cases, a plasma can be treated as a fluid and its stability analyzed with magnetohydrodynamics (MHD).

Field-reversed configuration

A field-reversed configuration (FRC) is a type of plasma device studied as a means of producing nuclear fusion. It confines a plasma on closed magnetic field lines without a central penetration. In an FRC, the plasma has the form of a self-stable torus, similar to a smoke ring. FRCs are closely related to another self-stable magnetic confinement fusion device, the spheromak. Both are considered part of the compact toroid class of fusion devices.

Stellarator

Le stellarator (de stellar : stellaire, et generator : générateur) est un dispositif destiné à la production de réactions contrôlées de fusion nucléaire proche du tokamak. Le confinement du plasma est entièrement réalisé par un champ magnétique hélicoïdal créé par l'arrangement complexe de bobines autour du tore, alimentées en courants forts et appelées bobines poloïdales. Le stellarator est analogue au tokamak à la différence qu'il n'utilise pas de courant toroïdal circulant à l'intérieur du plasma pour le confiner.

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Publications associées (28)

Global fluid simulations of plasma turbulence in stellarators

António João Caeiro Heitor Coelho

In order to cope with the decarbonization challenge faced by many countries, fusion is one of the few alternatives to fossil fuels for the production of electricity. Two devices invented in the middle of the previous century have emerged as the most promis ...

EPFL2024

Global fluid simulation of plasma turbulence in stellarators with the GBS code

Joaquim Loizu Cisquella, Paolo Ricci, António João Caeiro Heitor Coelho

The implementation of three-dimensional magnetic fields, such as the ones of stellarators, in the GBS code (Ricci et al 2012 Plasma Phys. Control. Fusion54 124047; Giacomin et al 2022 J. Comput. Phys.464 111294) is presented, and simulation results are dis ...

IOP Publishing Ltd2024

Nonlinear simulation of plasma turbulence using a gyrokinetic moment-based approach

Antoine Cyril David Hoffmann

Plasma turbulence plays a fundamental role in determining the performances of magnetic confinement fusion devices, such as tokamaks. Advances in computer science, combined with the development of efficient physical models, have significantly improved our u ...

EPFL2024

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