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000910638 1001_ $$00000-0002-8447-868X$$aRichou, Marianne$$b0$$eCorresponding author
000910638 245__ $$aFirst plasma exposure of a pre-damaged ITER-like plasma-facing unit in the WEST tokamak: procedure for the PFU preparation and lessons learned
000910638 260__ $$aVienna$$bIAEA$$c2022
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000910638 520__ $$aThe evaluation of the impact of plasma-facing components damage on subsequent plasma operation is an important issue for ITER. During the first phase of the operation of WEST, a few ITER-like divertor plasma-facing units (PFUs) have been installed on the lower divertor. One PFU was pre-damaged under electron beam gun thermal loading, before its installation in WEST, and the subsequent evolution of the damage was studied after the WEST plasma exposure. This paper presents the procedure followed to get the pre-damaged PFU. It consists of the characterization of the response of tungsten samples representative of WEST PFU under high heat flux (HHF) loading, the selection of damage (namely, small cracks, crack network, crack network, and W melt droplets). Finally, according to the WEST plasma loading conditions, the blocks with damage within the PFU and the position of the pre-damaged PFU on the WEST lower divertor are attributed. The first results obtained after an initial plasma exposure in WEST lead to the assessment, as expected with regard to the heat loading conditions, that no major surface aspect modification was found. This result emphasized the possibility of implementing as pre-damaged small droplets of melted tungsten in a high heat-loaded zone for a future WEST experimental campaign.
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000910638 7001_ $$00000-0002-6566-6116$$aCorre, Yann$$b1
000910638 7001_ $$0P:(DE-Juel1)129751$$aLoewenhoff, Thorsten$$b2
000910638 7001_ $$00000-0002-8334-3521$$aDiez, Mathilde$$b3
000910638 7001_ $$00000-0002-4704-3273$$aMartin, Céline$$b4
000910638 7001_ $$0P:(DE-HGF)0$$aAretz, Anke$$b5
000910638 7001_ $$0P:(DE-Juel1)2594$$aCoenen, Jann Willem$$b6
000910638 7001_ $$00000-0002-6921-0116$$aFirdaouss, Mehdi$$b7
000910638 7001_ $$0P:(DE-HGF)0$$aGiacometti, Gregory$$b8
000910638 7001_ $$00000-0002-2166-5621$$aGrosjean, Alex$$b9
000910638 7001_ $$0P:(DE-Juel1)129778$$aPintsuk, Gerald$$b10
000910638 7001_ $$0P:(DE-HGF)0$$aRoche, Hélène$$b11
000910638 7001_ $$0P:(DE-HGF)0$$aSpähn, Michael$$b12
000910638 7001_ $$00000-0002-4173-0961$$aDe Temmerman, Gregory$$b13
000910638 7001_ $$0P:(DE-HGF)0$$aTsitrone, Emmanuelle$$b14
000910638 7001_ $$0P:(DE-Juel1)129811$$aWirtz, Marius$$b15
000910638 7001_ $$0P:(DE-HGF)0$$aWEST Team, the$$b16
000910638 773__ $$0PERI:(DE-600)2037980-8$$a10.1088/1741-4326/ac412e$$gVol. 62, no. 5, p. 056010 -$$n5$$p056010 -$$tNuclear fusion$$v62$$x0029-5515$$y2022
000910638 8564_ $$uhttps://juser.fz-juelich.de/record/910638/files/Richou_2022_Nucl._Fusion_62_056010.pdf$$yRestricted
000910638 8564_ $$uhttps://juser.fz-juelich.de/record/910638/files/Postprint_Brez_First%20Plasma%20exposure.pdf$$yPublished on 2022-03-22. Available in OpenAccess from 2023-03-22.
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