Physics of the electric field in the scrape-off layer in ASDEX Upgrade L-mode discharges and comparison to experiments

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F22%3A00563273" target="_blank" >RIV/61389021:_____/22:00563273 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2352179122001430?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2352179122001430?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.nme.2022.101262" target="_blank" >10.1016/j.nme.2022.101262</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Physics of the electric field in the scrape-off layer in ASDEX Upgrade L-mode discharges and comparison to experiments

Popis výsledku v původním jazyce

The electric field in the Scrape-Off Layer (SOL) of fusion plasmas is a key quantity affecting the local plasma transport and possibly also the overall plasma confinement. However, the physics determining the SOL electric field is experimentally not well investigated. In this study a systematic experimental analysis of the electric field in AUG L-mode discharges at various plasma currents, densities and heating powers is presented. In particular, the relation of the electric field to the divertor condition, as measured by Langmuir probes, is analyzed in detail by applying a simplified form of Ohm's law. The analysis shows that the peak value of the radial electric field E-r in the near SOL measured by Doppler reflectometry decreases from about 8 kV/m at the lowest densities to2 kV/m at the highest densities, which is accompanied by a flattening of the outer divertor target electron temperature profiles. The electric field obtained by integrating Ohm's law from the divertor target to the midplane agrees with E-r in the near SOL within the uncertainties, evidencing the quantitative validity of the underlying model. Based on the findings about the relation between the electric field and the target conditions, a scaling to obtain the maximum of E-r in the SOL in terms of upstream parameters is developed.

Název v anglickém jazyce

Physics of the electric field in the scrape-off layer in ASDEX Upgrade L-mode discharges and comparison to experiments

Popis výsledku anglicky

The electric field in the Scrape-Off Layer (SOL) of fusion plasmas is a key quantity affecting the local plasma transport and possibly also the overall plasma confinement. However, the physics determining the SOL electric field is experimentally not well investigated. In this study a systematic experimental analysis of the electric field in AUG L-mode discharges at various plasma currents, densities and heating powers is presented. In particular, the relation of the electric field to the divertor condition, as measured by Langmuir probes, is analyzed in detail by applying a simplified form of Ohm's law. The analysis shows that the peak value of the radial electric field E-r in the near SOL measured by Doppler reflectometry decreases from about 8 kV/m at the lowest densities to2 kV/m at the highest densities, which is accompanied by a flattening of the outer divertor target electron temperature profiles. The electric field obtained by integrating Ohm's law from the divertor target to the midplane agrees with E-r in the near SOL within the uncertainties, evidencing the quantitative validity of the underlying model. Based on the findings about the relation between the electric field and the target conditions, a scaling to obtain the maximum of E-r in the SOL in terms of upstream parameters is developed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Nuclear Materials and Energy

ISSN

2352-1791

e-ISSN

2352-1791

Svazek periodika

33

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

101262

Kód UT WoS článku

000868495300001

EID výsledku v databázi Scopus

2-s2.0-85139591318