@article{9b6e0a99db194b4196a33d8211e018e6,
title = "Elemental and topographical imaging of microscopic variations in deposition on NSTX-U and DIII-D samples",
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.",
keywords = "Deposition, DiMES, Erosion, NSTX-U, Plasma-materials interaction, Surface analysis",
author = "Skinner, {C. H.} and Chrobak, {C. P.} and Jaworski, {M. A.} and R. Kaita and Koel, {Bruce E.}",
note = "Funding Information: The authors thank William Wampler for bringing this topic to the authors (CS) attention. They acknowledge important contributions from Doug Labrie and Gus Smalley in operating the Thermo Microlab SAM and from Ron Bell in image data analysis. The Leica DCM3D confocal microscope was available through the PRISM Imaging and Analysis Center. We thank Prof. Craig Arnold's group and especially Emre Turkoz for assistance with the Olympus LEXT confocal microscope. Support was provided by the U.S. DOE , Contract nos. DE AC02-09CH11466 , DE-AC52-07NA27344 and DE-NA0003525 . The digital data for this paper can be found in http://arks.princeton.edu/ark:/88435/dsp011v53k0334 Funding Information: The authors thank William Wampler for bringing this topic to the authors (CS) attention. They acknowledge important contributions from Doug Labrie and Gus Smalley in operating the Thermo Microlab SAM and from Ron Bell in image data analysis. The Leica DCM3D confocal microscope was available through the PRISM Imaging and Analysis Center. We thank Prof. Craig Arnold's group and especially Emre Turkoz for assistance with the Olympus LEXT confocal microscope. Support was provided by the U.S. DOE, Contract nos. DE AC02-09CH11466, DE-AC52-07NA27344 and DE-NA0003525. The digital data for this paper can be found in http://arks.princeton.edu/ark:/88435/dsp011v53k0334 Publisher Copyright: {\textcopyright} 2018 The Authors",
year = "2019",
month = jan,
doi = "10.1016/j.nme.2018.12.001",
language = "English (US)",
volume = "18",
pages = "35--40",
journal = "Nuclear Materials and Energy",
issn = "2352-1791",
publisher = "Elsevier Limited",
}