Investigation of He–W interactions using DiMES on DIII-D

Doerner, R. P.; Rudakov, D. L.; Chrobak, C. P.; Briesemeister, A. R.; Corr, C.; De Temmerman, G.; Kluth, P.; Lasnier, C. J.; McLean, A. G.; Pace, D. C.; Pitts, R. A.; Schmitz, O.; Thompson, M.; Winters, V.

doi:10.1088/0031-8949/T167/1/014054

Title: Investigation of He–W interactions using DiMES on DIII-D

Journal Article · Fri Jan 22 00:00:00 EST 2016 · Physica Scripta

DOI:https://doi.org/10.1088/0031-8949/T167/1/014054· OSTI ID:1319233

Doerner, R. P. ^[1]; Rudakov, D. L. ^[1]; Chrobak, C. P. ^[2]; Briesemeister, A. R. ^[3]; Corr, C. ^[4]; De Temmerman, G. ^[5]; Kluth, P. ^[4]; Lasnier, C. J. ^[6]; McLean, A. G. ^[6]; Pace, D. C. ^[2]; Pitts, R. A. ^[5]; Schmitz, O. ^[7]; Thompson, M. ^[4]; Winters, V. ^[7]

Univ. of California, San Diego, CA (United States). Center for Energy Research
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Australian National Univ., Canberra, ACT (Australia). Research School of Physics and Engineering
ITER Organization, Saint Paul-Lez-Durance (France)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Wisconsin, Madison, WI (United States)

Tungsten button samples were exposed to He ELMing H-mode plasma in DIII-D using 2.3 MW of Electron Cyclotron heating power. Prior to the exposures, the W buttons were exposed to either He, or D, plasma in PISCES-A for 2000 seconds at surface temperatures of 225–850 C to create a variety of surfaces (surface blisters, subsurface nano-bubbles, fuzz). Erosion was spectroscopically measured from each DiMES sample, with the exception of the fuzzy W samples which showed almost undetectable WI emission. Post-exposure grazing incidence small angle x-ray scattering (GISAXS) surface analysis showed the formation of 1.5 nm diameter He bubbles in the surface of W buttons after only a single DIII-D (3 sec., ~150 ELMs) discharge, similar to the bubble layer resulting from the 2000 sec. exposure in PISCES-A. No surface roughening, or damage, was detected on the samples after approximately 600 ELMs with energy density between 0.04 – 0.1 MJm-2.

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Research Organization:: Univ. of California, San Diego, CA (United States); Univ. of Wisconsin, Madison, WI (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)

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

Contributing Organization:: ITER Organization, Saint Paul-Lez-Durance (France); Australian National Univ., Canberra, ACT (Australia)

Grant/Contract Number:: FG02-07ER54917; FG02-89ER53296; FG02-08ER54999; FG02-07ER54912; AC52-07NA27344; AC05-00OR22725; FC02-04ER54698

OSTI ID:: 1319233

Alternate ID(s):: OSTI ID: 1372317

Journal Information:: Physica Scripta, Vol. 2016, Issue T167; ISSN 0031-8949

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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References (15)

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The influence of plasma-surface interaction on the performance of tungsten at the ITER divertor vertical targets De Temmerman, G.; Hirai, T.; Pitts, R. A. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaaf62	journal	March 2018
Plasma Power Recycling at the Divertor Surface Tang, Xian-Zhu; Guo, Zehua Fusion Science and Technology, Vol. 71, Issue 1 https://doi.org/10.13182/fst16-119	journal	January 2017

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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helium
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