Analysis of RE beams in COMPASS and JET using betatron equilibrium and radiation diagnostics

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F21%3A00353910" target="_blank" >RIV/68407700:21340/21:00353910 - isvavai.cz</a>
Result on the web
<a href="http://ocs.ciemat.es/EPS2021PAP/pdf/P3.1034.pdf" target="_blank" >http://ocs.ciemat.es/EPS2021PAP/pdf/P3.1034.pdf</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Analysis of RE beams in COMPASS and JET using betatron equilibrium and radiation diagnostics
Original language description
High energy runaway electron (RE) beams in tokamaks require significant vertical field to be maintained in a stable radial position within the tokamak chamber, and this field is not only dependent on the beam current but also on its average electron energy. What would appear as a radial outward drift of an accelerated relativistic particle in a static magnetic equilibrium background becomes macroscopic radial movement of the whole magnetic equilibrium in the case of a beam current formed exclusively by the relativistic particles even in configurations with strong toroidal magnetic field. This additional relativistic pressure needs to be compensated by increased external vertical field. This effect appears to be dominant in small tokamaks like COMPASS [1],[2], allowing for a rough estimate of the total beam kinetic energy based on the radial position and vertical magnetic field or beta normalised (βN) calculated by MHD equilibrium reconstruction code EFIT. Implementation of this effect of the RE beam energy also allowed us to improve position control during the RE beam phase. The JET magnetic equilibrium data suggest that this effect may be also observed in runaway electron experiments at large devices so that βN values allow for an estimate of the energy evolution.
Czech name
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Czech description
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Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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