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000878798 1001_ $$0P:(DE-Juel1)177637$$aZhao, Dongye$$b0$$eCorresponding author$$ufzj
000878798 245__ $$aEx situ analysis of W7-X divertor plasma-facing components by picosecond laser diagnostics
000878798 260__ $$aStockholm$$bThe Royal Swedish Academy of Sciences$$c2020
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000878798 520__ $$aA key question of long-pulse operation in the stellarator Wendelstein 7-X (W7-X) is the net erosion of plasma-facing components (PFCs), which determines W7-X PFC lifetimes as well as the impact on the impurity influx to the plasma. In order to judge the erosion and deposition balance at the passively cooled graphite divertor, a set of exchangeable graphite tiles with marker layer stripes consisting of 5–10 μm C deposited on a 200 nm thick Mo interlayer were installed as an integral part of the divertor surface and removed at the end of the first operational phase for post-operational analysis. Laser-induced breakdown spectroscopy (LIBS) combined with laser-induced ablation-quadrupole mass spectrometry (LIA-QMS) were used for further analysis. The LIBS results show that the erosion-dominated regions are close to the location of the strike lines in standard magnetic configuration of W7-X optimised for the island divertor concept. Almost the complete C/Mo marker layer is eroded in these regions, providing an average erosion rate of 4.3 nm s−1 in the 2481 s plasma seconds of the campaign. In parallel, only a little deposition at the edge of the divertor tiles, where Mo is observed on the bulk graphite material was found. Furthermore, LIA-QMS showed a high hydrogen content on uncoated bulk graphite areas, while a lower hydrogen concentration was detected in the erosion-dominated zone, caused by the high surface temperature at the strike line during plasma operation.
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000878798 7001_ $$0P:(DE-Juel1)177042$$aYi, R.$$b1
000878798 7001_ $$0P:(DE-Juel1)169485$$aOelmann, J.$$b2
000878798 7001_ $$0P:(DE-Juel1)129976$$aBrezinsek, S.$$b3
000878798 7001_ $$0P:(DE-Juel1)162160$$aRasinski, M.$$b4
000878798 7001_ $$0P:(DE-Juel1)161317$$aGao, Y.$$b5
000878798 7001_ $$0P:(DE-HGF)0$$aMayer, M.$$b6
000878798 7001_ $$0P:(DE-HGF)0$$aDhard, C. P.$$b7
000878798 7001_ $$0P:(DE-HGF)0$$aKrause, M.$$b8
000878798 773__ $$0PERI:(DE-600)1477351-x$$a10.1088/1402-4896/ab3ee1$$gVol. T171, p. 014018 -$$p014018 -$$tPhysica scripta$$vT171$$x1402-4896$$y2020
000878798 8564_ $$uhttps://juser.fz-juelich.de/record/878798/files/Zhao_2020_Phys._Scr._2020_014018.pdf$$yRestricted
000878798 8564_ $$uhttps://juser.fz-juelich.de/record/878798/files/Postprint%20Oelmann_Ex-situ%20Analysis%20of%20W7-X%20Divertor.pdf$$yPublished on 2020-02-27. Available in OpenAccess from 2021-02-27.
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