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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

Nuclear Materials and Energy

ISSN

2352-1791

e-ISSN

2352-1791

Volume of the periodical

33

Issue of the periodical within the volume

October

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

7

Pages from-to

101262

UT code for WoS article

000868495300001

EID of the result in the Scopus database

2-s2.0-85139591318