Calorimetry probe measurements of the runaway electron impact energy on plasma facing components at COMPASS tokamak

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F22%3A00366167" target="_blank" >RIV/68407700:21340/22:00366167 - isvavai.cz</a>

Výsledek na webu

<a href="http://ocs.ciemat.es/EPS2022PAP/pdf/P2b.118.pdf" target="_blank" >http://ocs.ciemat.es/EPS2022PAP/pdf/P2b.118.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Calorimetry probe measurements of the runaway electron impact energy on plasma facing components at COMPASS tokamak

Popis výsledku v původním jazyce

Runaway electrons (RE) can carry a significant part of the pre-disruptive plasma energy. If they strike the plasma-facing components (PFC), they deposit their energy in the form of high heat loads, which can lead to serious damage [1]. To study the RE heat loads on the most affected PFC (LFS limiter) in reaction to various mitigation strategies, a new diagnostic - a calorimetry probe - was developed at the COMPASS tokamak [2]. The temperature measurements of the graphite head before, during, and after a discharge were used for the identification of plasma and RE impacts. From the temperature increase, the total deposited energy was estimated. Using the surface temperature measurements by an IR camera, it was also possible to estimate the incident heat loads. A unique experimental scenario [3] allowed to study the effects of various mitigation strategies and RE control techniques, such as impurity injection and the RE beam position control. The results of these measurements will be presented in this contribution. The maximum energy deposited to the probe was (15 ± 1) kJ during a discharge with an additional acceleration by a positive loop voltage. Positive effects of lowering the deposited energy were observed mainly after injection of neon and deuterium by the secondary gas puff into the RE beam. Lower heat loads were also observed during discharges with an active radial position control of the RE beam.

Název v anglickém jazyce

Calorimetry probe measurements of the runaway electron impact energy on plasma facing components at COMPASS tokamak

Popis výsledku anglicky

Runaway electrons (RE) can carry a significant part of the pre-disruptive plasma energy. If they strike the plasma-facing components (PFC), they deposit their energy in the form of high heat loads, which can lead to serious damage [1]. To study the RE heat loads on the most affected PFC (LFS limiter) in reaction to various mitigation strategies, a new diagnostic - a calorimetry probe - was developed at the COMPASS tokamak [2]. The temperature measurements of the graphite head before, during, and after a discharge were used for the identification of plasma and RE impacts. From the temperature increase, the total deposited energy was estimated. Using the surface temperature measurements by an IR camera, it was also possible to estimate the incident heat loads. A unique experimental scenario [3] allowed to study the effects of various mitigation strategies and RE control techniques, such as impurity injection and the RE beam position control. The results of these measurements will be presented in this contribution. The maximum energy deposited to the probe was (15 ± 1) kJ during a discharge with an additional acceleration by a positive loop voltage. Positive effects of lowering the deposited energy were observed mainly after injection of neon and deuterium by the secondary gas puff into the RE beam. Lower heat loads were also observed during discharges with an active radial position control of the RE beam.

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

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název statě ve sborníku

48th EPS Conference on Plasma Physics, EPS 2022

ISBN

979-10-96389-16-2

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

online

Datum konání akce

27. 6. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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