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000826069 1001_ $$0P:(DE-Juel1)129976$$aBrezinsek, S.$$b0$$eCorresponding author$$ufzj
000826069 245__ $$aSurface modification of He pre-exposed tungsten samples by He plasma impact in the divertor manipulator of ASDEX Upgrade
000826069 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2017
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000826069 520__ $$aTungsten (W) will be used as material for plasma-facing components (PFCs) in the divertor of ITER and interact with Helium (He) ions either from initial He plasma operation or from Deuterium-Tritium (DT) fusion reactions in the active operation phase. Laboratory experiments reported that in a specific operational window of impact energy, ion fluence, and surface temperature (Ein ≥ 20 eV, ϕ ≥ 1 × 1024 Hem Tsurf ≥ 1000 K) a modification of W surfaces occurs resulting in the formation of He-induced W nanostructures. Experiments in ASDEX Upgrade H-mode plasmas ( T,  MA, Paux ≃ 8.0 MW) in He have been carried out to investigate in detail (a) the potential growth of W nanostructures on pre-damaged W samples incorporating He nanobubbles, and (b) the potential ELM-induced erosion of W nanostructure. Both W surface modifications were generated artificially in the GLADIS facility by He bombardment of W samples at  keV (a) to ϕ ≃ 0.75 × 1024 He0m at Tsurf ≃ 1800 K and (b) ϕ ≃ 1 × 1024 He0m at Tsurf ≃ 2300 K prior to exposure in the divertor manipulator of ASDEX Upgrade. Though in part (a) conditions of W nanostructure growth with a total He ion fluence of ϕ ≃ 1.6 × 1024 Hem and peak He ion impact energies above 150 eV were met, no growth could be detected. In part (b) lower density plasmas with more pronounced type I ELMs, carrying energetic He ions in the keV range, were executed with the strike-line positioned on 2 µm thick W nanostructure accumulating a fluence of ϕ ≃ 0.8 × 1024 Hem. Post-mortem analysis revealed that co-deposition by predominantly W, and Boron (B), eroded at the main chamber wall and transported into the divertor, took place on all W samples. Erosion of W nanostructure or its formation was hindered by the fact that the outer divertor at the location of the samples was turned under these He plasma conditions into a net deposition zone by W, B and Carbon (C) ions. The surface morphology with large roughness and effective surface area act as a catcher for the impinging impurities. Thus, apart from operation in the existence diagram of W nanostructure with respect to Tsurf, ϕ, and Ein, also the impinging impurity flux contribution needs to be considered in predictions concerning the formation of W nanostructures.
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000826069 7001_ $$0P:(DE-HGF)0$$aHakola, A.$$b1
000826069 7001_ $$0P:(DE-HGF)0$$aGreuner, H.$$b2
000826069 7001_ $$0P:(DE-HGF)0$$aBalden, M.$$b3
000826069 7001_ $$0P:(DE-HGF)0$$aKallenbach, A.$$b4
000826069 7001_ $$0P:(DE-HGF)0$$aOberkofler, M.$$b5
000826069 7001_ $$0P:(DE-HGF)0$$aDe Temmerman, G.$$b6
000826069 7001_ $$0P:(DE-HGF)0$$aDouai, D.$$b7
000826069 7001_ $$0P:(DE-HGF)0$$aLahtinen, A.$$b8
000826069 7001_ $$0P:(DE-HGF)0$$aBöswirth, B.$$b9
000826069 7001_ $$0P:(DE-HGF)0$$aBrida, D.$$b10
000826069 7001_ $$0P:(DE-HGF)0$$aCaniello, R.$$b11
000826069 7001_ $$0P:(DE-HGF)0$$aCarralero, D.$$b12
000826069 7001_ $$0P:(DE-HGF)0$$aElgeti, S.$$b13
000826069 7001_ $$0P:(DE-HGF)0$$aKrieger, K.$$b14
000826069 7001_ $$0P:(DE-HGF)0$$aMayer, H.$$b15
000826069 7001_ $$0P:(DE-HGF)0$$aMeisl, G.$$b16
000826069 7001_ $$0P:(DE-HGF)0$$aPotzel, S.$$b17
000826069 7001_ $$0P:(DE-HGF)0$$aRohde, V.$$b18
000826069 7001_ $$0P:(DE-HGF)0$$aSieglin, B.$$b19
000826069 7001_ $$0P:(DE-Juel1)130166$$aTerra, A.$$b20$$ufzj
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000826069 7001_ $$0P:(DE-Juel1)157640$$aLinsmeier, Ch.$$b22$$ufzj
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