Reprint of: Arc erosion of full metal plasma facing components at the inner baffle region of ASDEX Upgrade. (August 2017)

• Record Type: Journal Article
• Authors: Rohde, V.; Balden, M.
• Is Part Of: Nuclear materials and energy. Volume 12(2017)
• Page Start: 429
• Page End: 432
• Publication Date: 2017-08
• Subjects: Nuclear energy -- Periodicals; Nuclear fuels -- Periodicals; Nuclear reactors -- Materials -- Periodicals; Radioactive substances -- Periodicals; 621.4833
• DOI: 10.1016/j.nme.2017.09.004
• Languages: English
• ISSNs: 2352-1791

Abstract

Highlights: At the inner baffle of the AUG divertor massive polished inserts of tungsten and P92 steel were installed to measure the erosion by arcing. For tungsten few craters up to 4 µm resulting in an average erosion rate of 2 × 10 13 at cm −2 s −2 are observed. For P92 steel the traces are 4 µm deep, up to 80 µm were observed. The average erosion rate of 400 × 10 13 at cm −2 s −2, i.e. more than a factor of hundred higher compared to tungsten. Abstract: At the inner baffle of the AUG divertor massive polished inserts of tungsten and P92 steel were installed to measure the erosion by arcing. For tungsten most of the traces are less than 0.4 µm deep and a similar amount of tungsten is deposited close to the traces. Few craters up to 4 µm resulting in an average erosion rate of 2 × 10 13 at cm −2 s −1 are observed. The behaviour for P92 steel is quite different: most of the traces are 4 µm deep, up to 80 µm were observed. An average erosion rate of 400 × 10 13 at cm −2 s −1, i.e. more than a factor of hundred higher compared to tungsten, is found. Therefore, erosion by arcing has to be taken into account to determine the optimal material mix for future fusion devices.