Experimental verification of ion impact angle distribution at divertor surfaces using micro-engineered targets on DiMES at DIII-D

Abe, S.; Skinner, C. H.; Bykov, I.; Yeh, Y. W.; Lasa, A.; Coburn, J.; Rudakov, D. L.; Lasnier, C. J.; Wang, H. Q.; McLean, A. G.; Abrams, T.; Koel, B. E.

doi:10.1016/j.nme.2021.100965

Title: Experimental verification of ion impact angle distribution at divertor surfaces using micro-engineered targets on DiMES at DIII-D

Journal Article · Tue Jun 01 00:00:00 EDT 2021 · Nuclear Materials and Energy

DOI:https://doi.org/10.1016/j.nme.2021.100965· OSTI ID:1772145

Abe, S.; Skinner, C. H.; Bykov, I.; Yeh, Y. W.; Lasa, A.; Coburn, J.; Rudakov, D. L.; Lasnier, C. J.; Wang, H. Q.; McLean, A. G.; Abrams, T.; Koel, B. E.

We report the first detailed experimental verification of the polar deuterium ion impact angle distribution (IAD) on the DIII-D divertor surface in L-mode plasmas using micro-engineered trenches in samples mounted on the DiMES probe. These trenches were fabricated via focused ion beam (FIB) milling of a silicon surface partially coated with aluminum. The sample surfaces were exposed to eight repeat L-mode deuterium discharges (30 s total exposure time). The samples were examined by scanning electron microscopy (SEM), which revealed changes on the trench floor due to material deposition and evidence for shadowing of the incident deuterium ions by the trench walls. The areal distribution of carbon and aluminum deposition was measured by energy-dispersive X-ray spectroscopy (EDS). One-dimensional profiles of this deposition are in agreement with net erosion profiles calculated from a Monte Carlo micro-patterning and roughness (MPR) code for ion sputtering using as input the polar and azimuthal deuterium IADs reported previously. The deposition profiles verified the characteristic shape of the polar IADs, which have a broad maximum from 79° to 86°, over the experimental range of 68°–83°, where 0° is the surface normal direction.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)

Contributing Organization:: PCCM; Materials Research Science and Engineering Center, Harvard University

Grant/Contract Number:: SC0019308; AC02-09CH11466; FC02-04ER54698; AC52-07NA27344

OSTI ID:: 1772145

Alternate ID(s):: OSTI ID: 1778097; OSTI ID: 1779681; OSTI ID: 1877321

Report Number(s):: LLNL-JRNL-836403; S235217912100051X; 100965; PII: S235217912100051X

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Vol. 27 Journal Issue: C; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Divertor
Sheath
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Erosion
Deposition
DiMES
Plasma-material interaction
Surface analysis

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