Publication

Calculation of Stray Magnetic Field Effects on the Operation of the ITER Electron Cyclotron System

2011
Conference Papers

Abstract

In a multi-gyrotron system such as the one presently designed for the ITER ECH & ECCD system, stray magnetic fields can significantly alter the operational capabilities of the global system. A numerical study was carried out within the European Gyrotron Consortium (EGYC) to assess the importance of the different effects and their impact on the gyrotron operation. Using the Ariadne++ 3D code, and based on the geometrical layout of the ITER-EC system, the effect of the ITER stray magnetic field combined together with the stray field generated by neighboring gyrotrons on the electron beam parameters was considered. It is shown that these effects are important in the gyrotron collector regions in particular for gyrotrons located at the edges of the ITER EC system. The effect of ferromagnetic structure materials was studied using the finite element software package COMSOL Multiphyics. This study was simplified by considering the effect of only one realistic I-beam placed at different distances and orientations with respect to a single gyrotron. It is shown that, with the present geometrical layout of the ITER EC-system, the effects due to ferromagnetic material are negligible.

Official source

https://infoscience.epfl.ch/entities/publication/79f79b48-8ef0-4fbf-b7f9-cb4ac94835dc

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2011
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/79f79b48-8ef0-4fbf-b7f9-cb4ac94835dc

About this result

Related concepts (32)

Ferromagnetism

Ferromagnetism is a property of certain materials (such as iron) that results in a significant, observable magnetic permeability, and in many cases, a significant magnetic coercivity, allowing the material to form a permanent magnet. Ferromagnetic materials are familiar metals that are noticeably attracted to a magnet, a consequence of their substantial magnetic permeability. Magnetic permeability describes the induced magnetization of a material due to the presence of an external magnetic field.

ITER

ITER (initially the International Thermonuclear Experimental Reactor, iter meaning "the way" or "the path" in Latin) is an international nuclear fusion research and engineering megaproject aimed at creating energy through a fusion process similar to that of the Sun. Upon completion of construction of the main reactor and first plasma, planned for late 2025, it will be the world's largest magnetic confinement plasma physics experiment and the largest experimental tokamak nuclear fusion reactor.

Magnetic domain

A magnetic domain is a region within a magnetic material in which the magnetization is in a uniform direction. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction. When cooled below a temperature called the Curie temperature, the magnetization of a piece of ferromagnetic material spontaneously divides into many small regions called magnetic domains. The magnetization within each domain points in a uniform direction, but the magnetization of different domains may point in different directions.

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Calculation of Stray Magnetic Field Effects on the Operation of the ITER Electron Cyclotron System

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