Determination of the plasma potential and the EEDF by Langmuir probes in the divertor region of COMPASS tokamak

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F16%3A00466022" target="_blank" >RIV/61389021:_____/16:00466022 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1742-6596/768/1/012003" target="_blank" >http://dx.doi.org/10.1088/1742-6596/768/1/012003</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/768/1/012003" target="_blank" >10.1088/1742-6596/768/1/012003</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Determination of the plasma potential and the EEDF by Langmuir probes in the divertor region of COMPASS tokamak

Popis výsledku v původním jazyce

This paper reports experimental data obtained on the COMPASS tokamak by Langmuir probes embedded in the divertor tiles. The measured current-voltage (IV) probe characteristics were processed by the recently published first derivative probe technique for precise determination of the plasma potential and the electron energy distribution function (EEDF). Measurements were performed during L-mode hydrogen and deuterium plasmas with toroidal magnetic field BT =1.15 T, plasma current Ip=180 kA and averaged electron density ne = 8*1019 m−3. The spatial profile of the electron temperatures shows that in hydrogen plasmas in the vicinity of the inner and outer strike points the EEDF can be approximated by a bi-Maxwellian distribution, with a dominating low-energy electron population (4 - 7 eV) and a minority of higher energy electrons (12 - 25 eV). In the private flux region between the two strike points the electron energy distribution function is found to be Maxwellian with temperatures in the range of 7 - 10 eV. In the case of deuterium plasmas at similar conditions of the discharge the EEDFs are found to be always bi-Maxwellian.n

Název v anglickém jazyce

Determination of the plasma potential and the EEDF by Langmuir probes in the divertor region of COMPASS tokamak

Popis výsledku anglicky

This paper reports experimental data obtained on the COMPASS tokamak by Langmuir probes embedded in the divertor tiles. The measured current-voltage (IV) probe characteristics were processed by the recently published first derivative probe technique for precise determination of the plasma potential and the electron energy distribution function (EEDF). Measurements were performed during L-mode hydrogen and deuterium plasmas with toroidal magnetic field BT =1.15 T, plasma current Ip=180 kA and averaged electron density ne = 8*1019 m−3. The spatial profile of the electron temperatures shows that in hydrogen plasmas in the vicinity of the inner and outer strike points the EEDF can be approximated by a bi-Maxwellian distribution, with a dominating low-energy electron population (4 - 7 eV) and a minority of higher energy electrons (12 - 25 eV). In the private flux region between the two strike points the electron energy distribution function is found to be Maxwellian with temperatures in the range of 7 - 10 eV. In the case of deuterium plasmas at similar conditions of the discharge the EEDFs are found to be always bi-Maxwellian.n

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

Journal of Physics: Conference Series

ISBN

—

ISSN

1742-6588

e-ISSN

1742-6596

Počet stran výsledku

4

Strana od-do

012003

Název nakladatele

IOP Publishing, Ltd.

Místo vydání

Bristol

Místo konání akce

Kiten

Datum konání akce

30. 6. 2014

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000439544000003