Measurements of tungsten migration in the DIII-D divertor

Wampler, W. R.; Rudakov, D. L.; Watkins, J. G.; McLean, A. G.; Unterberg, E. A.; Stangeby, P. C.

doi:10.1088/1402-4896/aa8d5a

Title: Measurements of tungsten migration in the DIII-D divertor

Journal Article · Fri Oct 20 00:00:00 EDT 2017 · Physica Scripta

DOI:https://doi.org/10.1088/1402-4896/aa8d5a· OSTI ID:1477317

Wampler, W. R. ^[1]; Rudakov, D. L. ^[1]; Watkins, J. G. ^[1]; McLean, A. G. ^[2];

^[3]; Stangeby, P. C. ^[4]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Toronto, ON (Canada)

An experimental study of migration of tungsten in the DIII-D divertor is described, in which the outer strike point of L-mode plasmas was positioned on a toroidal ring of tungsten-coated metal inserts. Net deposition of tungsten on the divertor just outside the strike point was measured on graphite samples exposed to various plasma durations using the divertor materials evaluation system. Tungsten coverage, measured by Rutherford backscattering spectroscopy (RBS), was found to be low and nearly independent of both radius and exposure time closer to the strike point, whereas farther from the strike point the W coverage was much larger and increased with exposure time. Depth profiles from RBS show this was due to accumulation of thicker mixed-material deposits farther from the strike point where the plasma temperature is lower. These results are consistent with a low near-surface steady-state coverage on graphite undergoing net erosion, and continuing accumulation in regions of net deposition. This experiment provides data needed to validate, and further improve computational simulations of erosion and deposition of material on plasma-facing components and transport of impurities in magnetic fusion devices. Such simulations are underway and will be reported later.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC04-94AL85000; AC05-00OR22725

OSTI ID:: 1477317

Alternate ID(s):: OSTI ID: 1483173

Report Number(s):: SAND-2018-10807J; 668371

Journal Information:: Physica Scripta, Vol. T170; ISSN 0031-8949

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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References (11)

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Cited By (3)

Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER Abrams, T.; Unterberg, E. A.; Rudakov, D. L. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5089895	journal	June 2019
Multiple Analytical Approach to Isotopic Transport Analysis in Magnetic Fusion Devices Duran, Jonah D.; Unterberg, Ezekial A.; Zach, Mike P. Fusion Science and Technology, Vol. 75, Issue 6 https://doi.org/10.1080/15361055.2019.1610316	journal	May 2019
DIII-D research towards establishing the scientific basis for future fusion reactors Petty, C. C. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab024a	journal	June 2019

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