Effects of magnetic perturbations and radiation on the runaway avalanche

Examensarbete för masterexamen

Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12380/300784
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Bibliographical item details
Type: Examensarbete för masterexamen
Title: Effects of magnetic perturbations and radiation on the runaway avalanche
Authors: Svensson, Pontus
Abstract: Electron runaway is seen as one of the main threats to reliable operation of magnetic confinement fusion reactors, and is an issue only predicted to worsen as reactors are scaled up. The runaway phenomenon depends fundamentally on momentum space dynamics, but to simulate large scale systems effective theories which depend only on spatial quantities are often employed. In this thesis, we will address how a momentum space dependent diffusive transport, which appears as a consequence of imperfect confining magnetic fields, can be incorporated into this type of model. A scheme to correct the generation of runaway electrons due to this transport, which incorporates the effect of radiation reaction forces, is proposed. The corrected generation of runaway electrons is formulated as a solution to an integral equation, for which a numerical solver is implemented. The effect of the model is investigated for diffusion coefficients inspired by electron diffusion in stochastic magnetic fields where a reduced generation and a larger critical electric field for the runaway generation is observed.
Keywords: fusion;runaway electrons;radial diffusion;radiation reaction force
Issue Date: 2020
Publisher: Chalmers tekniska högskola / Institutionen för fysik
URI: https://hdl.handle.net/20.500.12380/300784
Collection:Examensarbeten för masterexamen // Master Theses

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