Experimental estimation of tungsten impurity sputtering due to Type i ELMs in JET-ITER-like wall using pedestal electron cyclotron emission and target Langmuir probe measurements

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F16%3A00459873" target="_blank" >RIV/61389021:_____/16:00459873 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1088/0031-8949/2015/T167/014005" target="_blank" >http://dx.doi.org/10.1088/0031-8949/2015/T167/014005</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0031-8949/2015/T167/014005" target="_blank" >10.1088/0031-8949/2015/T167/014005</a>

Result language

angličtina

Original language name

Experimental estimation of tungsten impurity sputtering due to Type i ELMs in JET-ITER-like wall using pedestal electron cyclotron emission and target Langmuir probe measurements

Original language description

The ITER baseline scenario, with 500 MW of DT fusion power and Q = 10, will rely on a Type I ELMy H-mode and will be achieved with a tungsten (W) divertor. W atoms sputtered from divertor targets during mitigated ELMs are expected to be the dominant source in ITER. W impurity concentration in the plasma core can dramatically degrade its performance and lead to potentially damaging disruptions. Understanding the physics of the target W source due to sputtering during ELMs and inter-ELMs is important and can be helped by experimental measurements with improved precision. It has been established that the ELMy target ion impact energy has a simple linear dependence with the pedestal electron temperature measured by Electron Cyclotron Emission (ECE). It has also been shown that Langmuir Probes (LP) ion flux measurements are reliable during ELMs due to the surprisingly low electron temperature. Therefore, in this paper, LP and ECE measurements in JET-ITER-Like-Wall (ILW) unseeded Type I ELMy H-mode experiments have been used to estimate the W sputtering flux from divertor targets in ELM and inter-ELM conditions. Comparison with similar estimates using W I spectroscopy measurements shows a reasonable agreement for the ELM and inter-ELM W source. The main advantage of the method involving LP measurements is the very high time resolution of the diagnostic (10 μs) allowing very precise description of the W sputtering source during ELMs.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BL - Plasma physics and discharge through gases

OECD FORD branch

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Project

<a href="/en/project/LG14002" target="_blank" >LG14002: Direct scientific participation in the thermonuclear research programme of the Joint European Torus JET</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

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

T167

Issue of the periodical within the volume

February

Country of publishing house

SE - SWEDEN

Number of pages

8

Pages from-to

014005

UT code for WoS article

000383504700006

EID of the result in the Scopus database

2-s2.0-84959888195