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ITPA Avilla January 2008 © Matej Mayer Surface modifications and blistering of tungsten exposed in ASDEX Upgrade M. Mayer, M. Balden, S. Lindig, J. Roth,

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Presentation on theme: "ITPA Avilla January 2008 © Matej Mayer Surface modifications and blistering of tungsten exposed in ASDEX Upgrade M. Mayer, M. Balden, S. Lindig, J. Roth,"— Presentation transcript:

1 ITPA Avilla January 2008 © Matej Mayer Surface modifications and blistering of tungsten exposed in ASDEX Upgrade M. Mayer, M. Balden, S. Lindig, J. Roth, R. Neu, ASDEX Upgrade team Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching, Germany

2 ITPA Avilla January 2008 © Matej Mayer Blister formation in W, laboratory studies W. Wang et al., JNM 299 (2001) 124 Surface modifications observed after bombardment of W by hydrogen in laboratory studies Blister formation Polycrystalline tungsten samples (Langmuir probes) exposed in AUG outer divertor in 2007 for 2620 s

3 ITPA Avilla January 2008 © Matej Mayer Langmuir probes from outer divertor Blister-like structures are observed

4 ITPA Avilla January 2008 © Matej Mayer Langmuir probes from outer divertor Do these structures contain voids? FIB using 30 keV Ga

5 ITPA Avilla January 2008 © Matej Mayer Langmuir probes from outer divertor Protective carbon coating for FIB

6 ITPA Avilla January 2008 © Matej Mayer Langmuir probes from outer divertor Blister-like structures filled with material, no voids These are no blisters

7 ITPA Avilla January 2008 © Matej Mayer Langmuir probes from outer divertor But:

8 ITPA Avilla January 2008 © Matej Mayer Langmuir probes from outer divertor A few blisters are observed in this area of the sample

9 ITPA Avilla January 2008 © Matej Mayer Summary Blister-like structures are observed, but they are solid and do not contain voids No blisters A few blisters are observed in some areas of the sample Surface modifications of W due to plasma exposure are small

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