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000891391 1001_ $$0P:(DE-Juel1)168195$$aSereda, S.$$b0$$eCorresponding author
000891391 245__ $$aImpact of boronizations on impurity sources and performance in Wendelstein 7-X
000891391 260__ $$aVienna$$bIAEA$$c2020
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000891391 520__ $$aThe low-Z oxygen and carbon were the main plasma impurities in the Wendelstein 7-X (W7-X) stellarator in the last experimental campaign with the passively cooled graphite divertor. To tackle this issue boronization (Winter et al 1989 J. Nucl. Mater. 162–4 712–23) was applied, which has led to one of the main achievements of the campaign: plasma operation at high core densities of more than 1020 m−3 in hydrogen fueled plasmas due to the reduced radiation-induced density limit.In total three boronizations were applied. After the first boronization the oxygen to hydrogen flux ratio (normalized influx of oxygen) at the divertor substantially decreased by a factor of 10 and the carbon to hydrogen flux ratio (normalized influx of carbon) decreased by a factor of 4 as obtained from spectroscopy. In the same time, boron emission appeared in the spectra. Between the boronizations oxygen and carbon normalized influxes increased but never reached the pre-boronization values. With each subsequent boronization O level decreased even more, reaching the lowest values after the third boronization which were more than a factor of 100 lower than before the first boronization.Such a decrease in low-Z impurity concentration significantly extended the operation window of W7-X in terms of line-integrated electron density (from 4ċ1019 m−2 to more than 1ċ1020 m−2) and diamagnetic energy (from 330 kJ up to 510 kJ). Zeff decreased from 4.5 down to values close to 1.2 as obtained from bremsstrahlung measurements. The above mentioned values are given for the two reference discharges before and after boronization.
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000891391 7001_ $$0P:(DE-Juel1)168296$$aWang, E.$$b2
000891391 7001_ $$00000-0002-3449-3654$$aBarbui, T.$$b3
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000891391 7001_ $$0P:(DE-Juel1)130088$$aLiang, Yunfeng$$b14$$ufzj
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000891391 7001_ $$0P:(DE-Juel1)162160$$aRasinski, M.$$b17
000891391 7001_ $$0P:(DE-HGF)0$$aRudischhauser, L.$$b18
000891391 7001_ $$0P:(DE-HGF)0$$aŚlęczka, M.$$b19
000891391 7001_ $$0P:(DE-HGF)0$$aSvensson, J.$$b20
000891391 7001_ $$0P:(DE-HGF)0$$aViebke, H.$$b21
000891391 7001_ $$0P:(DE-Juel1)145890$$aWauters, T.$$b22
000891391 7001_ $$aWei, Y.$$b23
000891391 7001_ $$00000-0001-8108-7774$$aWinters, V.$$b24
000891391 7001_ $$0P:(DE-Juel1)145222$$aZhang, D.$$b25
000891391 773__ $$0PERI:(DE-600)2037980-8$$a10.1088/1741-4326/ab937b$$gVol. 60, no. 8, p. 086007 -$$n8$$p086007 -$$tNuclear fusion$$v60$$x1741-4326$$y2020
000891391 8564_ $$uhttps://juser.fz-juelich.de/record/891391/files/Sereda_2020_Nucl._Fusion_60_086007.pdf$$yRestricted
000891391 8564_ $$uhttps://juser.fz-juelich.de/record/891391/files/Postprint_Sereda_Impact%20of%20boronizations.pdf$$yPublished on 2020-07-10. Available in OpenAccess from 2021-07-10.
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