Physics of the creation and mitigation of runaway electron beams in presence of their background plasma.

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Physics of the creation and mitigation of runaway electron beams in presence of their background plasma.

Popis výsledku v původním jazyce

Disruptions are a threat for the reliable operation of future tokamaks including ITER. Among other consequences, they can convert a significant fraction of the plasma current into Runaway Electrons (REs) in the MeV range. The possibility to suppress a runaway beam once it has been accelerated remains uncertain. Previous experiments at JET have shown that the suppressionnof a 750 kA runaway beam using massive gas injection was inefficient [1]. This situation contrasts with results of smaller tokamaks such as DIII-D[2], Asdex-Upgrade[3], TCV[4] and Tore Supra[5]. A number of explanations have been brought forward to explain the inefficiency: a gas plume geometry effect, a runaway current screening effect or the shielding by the cold backgroundnplasma coexisting with the runaway beam. This background plasma has already been observed on several machines[2, 5], but gaps remain in the understanding of its physics. The present paper reviews the three latter possible explanations and the interaction between REs, the background plasma and the mitigation gas.

Název v anglickém jazyce

Physics of the creation and mitigation of runaway electron beams in presence of their background plasma.

Popis výsledku anglicky

Disruptions are a threat for the reliable operation of future tokamaks including ITER. Among other consequences, they can convert a significant fraction of the plasma current into Runaway Electrons (REs) in the MeV range. The possibility to suppress a runaway beam once it has been accelerated remains uncertain. Previous experiments at JET have shown that the suppressionnof a 750 kA runaway beam using massive gas injection was inefficient [1]. This situation contrasts with results of smaller tokamaks such as DIII-D[2], Asdex-Upgrade[3], TCV[4] and Tore Supra[5]. A number of explanations have been brought forward to explain the inefficiency: a gas plume geometry effect, a runaway current screening effect or the shielding by the cold backgroundnplasma coexisting with the runaway beam. This background plasma has already been observed on several machines[2, 5], but gaps remain in the understanding of its physics. The present paper reviews the three latter possible explanations and the interaction between REs, the background plasma and the mitigation gas.

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

EPS 2017: 44th European Physical Society Conference on Plasma Physics

ISBN

979-10-96389-07

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

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Název nakladatele

European Physical Society

Místo vydání

Mulhouse

Místo konání akce

Belfast

Datum konání akce

26. 6. 2017

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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