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

Skinner, C. H.; Chrobak, C. P.; Jaworski, M. A.; Kaita, R.; Koel, B. E.

doi:10.1016/j.nme.2018.12.001

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

Journal Article · Tue Jan 01 00:00:00 EST 2019 · Nuclear Materials and Energy

DOI:https://doi.org/10.1016/j.nme.2018.12.001· OSTI ID:1484950

Skinner, C. H.;

; Jaworski, M. A.; Kaita, R.;

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.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466; AC52-07NA27344; NA0003525; SC0012890

OSTI ID:: 1484950

Alternate ID(s):: OSTI ID: 1511481; OSTI ID: 1571883

Report Number(s):: DOE-PU-0012890-5; S2352179118301327; PII: S2352179118301327

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Vol. 18 Journal Issue: C; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 3 works

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References (14)

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