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Elemental and topographical imaging of microscopic variations in deposition on NSTX-U and DIII-D samples

Author(s): Skinner, C.H.; Chrobak, C.P.; Jaworski, M.A.; Kaita, R.; Koel, Bruce E.

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Abstract: Tokamak plasma facing components have surface roughness that can cause microscopic spatial variations in erosion and deposition and hence influence material migration, erosion lifetime, dust and tritium accumulation, and plasma contamination. However, high spatial resolution measurements of deposition on a sub-µm scale of surface roughness have been lacking to date. We will present elemental images of graphite samples from NSTX-U and DIII-D DiMES experiments performed with a Scanning Auger Microprobe at sub-micron resolution that show strong microscopic variations in deposition and correlate this with 3D topographical maps of surface irregularities. The NSTX-U samples were boronized and exposed to deuterium plasmas. The DiMES samples had localized Al and W films and were exposed to dedicated helium plasmas. Topographical maps of the samples were performed with a 3D confocal optical microscope and compared to the elemental deposition pattern. The results revealed localized deposition concentrated in areas shadowed from the ion flux, incident in a direction calculated by taking account of the magnetic sheath.
Publication Date: 2019
Electronic Publication Date: 7-Dec-2018
Citation: Skinner, CH, Chrobak, CP, Jaworski, MA, Kaita, R, Koel, BE. (2019). Elemental and topographical imaging of microscopic variations in deposition on NSTX-U and DIII-D samples. Nuclear Materials and Energy, 18 (35 - 40). doi:10.1016/j.nme.2018.12.001
DOI: doi:10.1016/j.nme.2018.12.001
Pages: 35 - 40
Type of Material: Journal Article
Journal/Proceeding Title: Nuclear Materials and Energy
Version: Final published version. This is an open access article.

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