Sustained W-melting experiments on actively cooled ITER-like plasma facing unit in WEST

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F21%3A00552292" target="_blank" >RIV/61389021:_____/21:00552292 - isvavai.cz</a>

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1402-4896/ac326a" target="_blank" >https://iopscience.iop.org/article/10.1088/1402-4896/ac326a</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1402-4896/ac326a" target="_blank" >10.1088/1402-4896/ac326a</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Sustained W-melting experiments on actively cooled ITER-like plasma facing unit in WEST

Popis výsledku v původním jazyce

The consequences of tungsten (W) melting on divertor lifetime and plasma operation are high priority issues for ITER. Sustained and controlled W-melting experiment has been achieved for the first time in WEST on a poloidal sharp leading edge of an actively cooled ITER-like plasma facing unit (PFU). A series of dedicated high power steady state plasma discharges were performed to reach the melting point of tungsten. The leading edge was exposed to a parallel heat flux of about 100MW.m-2 for up to 5 s providing a melt phase of about 2 s without noticeable impact of melting on plasma operation (radiated power and tungsten impurity content remained stable at constant input power) and no melt ejection were observed. The surface temperature of theMBwas monitored by a high spatial resolution (0.1mm/pixel) infrared camera viewing the melt zone from the top of the machine. The melting discharge was repeated three times resulting in about 6 s accumulated melting duration leading to material displacement from three similar pools. Cumulated on the overall sustained melting periods, this leads to excavation depth of about 230 µmfollowed by a re-solidified tungsten bump of 200 µmin the JxB direction.

Název v anglickém jazyce

Sustained W-melting experiments on actively cooled ITER-like plasma facing unit in WEST

Popis výsledku anglicky

The consequences of tungsten (W) melting on divertor lifetime and plasma operation are high priority issues for ITER. Sustained and controlled W-melting experiment has been achieved for the first time in WEST on a poloidal sharp leading edge of an actively cooled ITER-like plasma facing unit (PFU). A series of dedicated high power steady state plasma discharges were performed to reach the melting point of tungsten. The leading edge was exposed to a parallel heat flux of about 100MW.m-2 for up to 5 s providing a melt phase of about 2 s without noticeable impact of melting on plasma operation (radiated power and tungsten impurity content remained stable at constant input power) and no melt ejection were observed. The surface temperature of theMBwas monitored by a high spatial resolution (0.1mm/pixel) infrared camera viewing the melt zone from the top of the machine. The melting discharge was repeated three times resulting in about 6 s accumulated melting duration leading to material displacement from three similar pools. Cumulated on the overall sustained melting periods, this leads to excavation depth of about 230 µmfollowed by a re-solidified tungsten bump of 200 µmin the JxB direction.

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

2021

Kód důvěrnosti údajů

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

Název periodika

Physica Scripta

ISSN

0031-8949

e-ISSN

1402-4896

Svazek periodika

96

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

SE - Švédské království

Počet stran výsledku

8

Strana od-do

124057

Kód UT WoS článku

000715528800001

EID výsledku v databázi Scopus

2-s2.0-85119062391