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

Kód výsledku v 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>

Výsledek na webu

<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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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Europhysics conference abstracts

ISBN

979-10-96389-13-1

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

625-628

Název nakladatele

European Physical Society

Místo vydání

Mulhouse

Místo konání akce

Sitges

Datum konání akce

21. 6. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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