ADVANCES IN THE PROBE TECHNIQUE DIAGNOSTICS OF FUSION PLASMA (VEIT2017)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00479844" target="_blank" >RIV/61389021:_____/17:00479844 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

ADVANCES IN THE PROBE TECHNIQUE DIAGNOSTICS OF FUSION PLASMA (VEIT2017)

Popis výsledku v původním jazyce

Předneseno na: 20th International Summer School Vacuum, Electron and Ion Technologies (VEIT2017), Sozopol, 25-29.09.2017.nThe Langmuir probe is among the most frequently used tools in evaluating the plasma potential, electron temperature and density in the vicinity of the last closed flux surface (LCFS) and in the scrape-off layer (SOL) of tokamaks. nHowever, in some cases in tokamak SOL plasmas, the EEDF can deviate from Maxwellian. To correctly obtain the EEDF, for more than ten years now the first-derivative probe technique (FDPT) has been applied to determine the plasma potential and the real electron energy distribution function in fusion plasmas. In this work, a comparison between recent results obtained by the FDPT and the conventional probe technique is performed in the case of sheath expansion of the ion part of the IV probe characteristics. It is demonstrated how this technique should be applied in the case of an unsaturated ion part. Possible difficulties in recognizing the sheath expansion are also discussed. A good agreement between the four-parameter fit and the first-derivative probe technique is demonstrated.n

Název v anglickém jazyce

ADVANCES IN THE PROBE TECHNIQUE DIAGNOSTICS OF FUSION PLASMA (VEIT2017)

Popis výsledku anglicky

Předneseno na: 20th International Summer School Vacuum, Electron and Ion Technologies (VEIT2017), Sozopol, 25-29.09.2017.nThe Langmuir probe is among the most frequently used tools in evaluating the plasma potential, electron temperature and density in the vicinity of the last closed flux surface (LCFS) and in the scrape-off layer (SOL) of tokamaks. nHowever, in some cases in tokamak SOL plasmas, the EEDF can deviate from Maxwellian. To correctly obtain the EEDF, for more than ten years now the first-derivative probe technique (FDPT) has been applied to determine the plasma potential and the real electron energy distribution function in fusion plasmas. In this work, a comparison between recent results obtained by the FDPT and the conventional probe technique is performed in the case of sheath expansion of the ion part of the IV probe characteristics. It is demonstrated how this technique should be applied in the case of an unsaturated ion part. Possible difficulties in recognizing the sheath expansion are also discussed. A good agreement between the four-parameter fit and the first-derivative probe technique is demonstrated.n

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>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