Investigation of transient melting of tungsten by ELMs in ASDEX Upgrade

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00482351" target="_blank" >RIV/61389021:_____/17:00482351 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1088/1402-4896/aa8be8" target="_blank" >http://dx.doi.org/10.1088/1402-4896/aa8be8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1402-4896/aa8be8" target="_blank" >10.1088/1402-4896/aa8be8</a>

Result language

angličtina

Original language name

Investigation of transient melting of tungsten by ELMs in ASDEX Upgrade

Original language description

Repetitive melting of tungsten by power transients originating from edge localized modes (ELMs) has been studied in the tokamak experiment ASDEX Upgrade. Tungsten samples were exposed to H-mode discharges at the outer divertor target plate using the Divertor Manipulator II system. The exposed sample was designed with an elevated sloped surface inclined against thenincident magnetic field to increase the projected parallel power flux to a level were transient melting by ELMs would occur. Sample exposure was controlled by moving the outer strike point to the sample location. As extension to previous melt studies in the new experiment both the current flow from the sample to vessel potential and the local surface temperature were measurednwith sufficient time resolution to resolve individual ELMs. The experiment provided for the first time a direct link of current flow and surface temperature during transient ELM events. This allows to further constrain the MEMOS melt motion code predictions and to improve the validation of its underlying model assumptions. Post exposure ex situ analysis of the retrieved samples confirms the decreased melt motion observed at shallower magnetic field line to surface angles compared to that at leading edges exposed to the parallel power flux.

Czech name

—

Czech description

—

Type

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

CEP classification

—

OECD FORD branch

10300 - Physical sciences

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

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

Name of the periodical

Physica Scripta

ISSN

0031-8949

e-ISSN

—

Volume of the periodical

T170

Issue of the periodical within the volume

December

Country of publishing house

SE - SWEDEN

Number of pages

8

Pages from-to

014030

UT code for WoS article

000414120500030

EID of the result in the Scopus database

—