Publication

Magnetic topology and guiding centre drift orbits in a reversed shear tokamak

Laurent Villard, Wilfred Anthony Cooper, Olivier Fischer
2000
Journal Articles

Abstract

The magnetic topology and particle drift orbits are analysed in a monotonic q profile and in a reversed shear TEXTOR equilibrium that is subject to a magnetic perturbation driven by the Dynamic Ergodic Divertor (DED). The main results prove that there exists a transport barrier for magnetic field lines and for circulating particles in the reversed shear case when the DED is applied. This transport barrier occurs near the surface of minimum q value where the KAM theory may be invalid. Moreover, it should be noted that trapped particles are lost due to the presence of ripple and that the DED does not affect their trajectories. To analyse magnetic topology, a symplectic perturbed map is used and the guiding centre orbits are evaluated in Boozer co-ordinates.

Official source

https://infoscience.epfl.ch/entities/publication/27bd1222-778e-4c51-a25f-c99e8aa42eaa

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Laurent Villard, Wilfred Anthony Cooper, Olivier Fischer
2000
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/27bd1222-778e-4c51-a25f-c99e8aa42eaa

About this result

Related concepts (32)

Magnetic reconnection

Magnetic reconnection is a physical process occurring in electrically conducting plasmas, in which the magnetic topology is rearranged and magnetic energy is converted to kinetic energy, thermal energy, and particle acceleration. Magnetic reconnection involves plasma flows at a substantial fraction of the Alfvén wave speed, which is the fundamental speed for mechanical information flow in a magnetized plasma. The concept of magnetic reconnection was developed in parallel by researchers working in solar physics and in the interaction between the solar wind and magnetized planets.

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Spherical tokamak

A spherical tokamak is a type of fusion power device based on the tokamak principle. It is notable for its very narrow profile, or aspect ratio. A traditional tokamak has a toroidal confinement area that gives it an overall shape similar to a donut, complete with a large hole in the middle. The spherical tokamak reduces the size of the hole as much as possible, resulting in a plasma shape that is almost spherical, often compared to a cored apple. The spherical tokamak is sometimes referred to as a spherical torus and often shortened to ST.

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Magnetic topology and guiding centre drift orbits in a reversed shear tokamak

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