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

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

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

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

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

^*Corresponding author for this work

Research School of Physics

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

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 s 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 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 s, ∼150 ELMs) discharge, similar to the bubble layer resulting from the 2000 s. 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 MJ m^-2.

Original language	English
Article number	014054
Number of pages	5
Journal	Physica Scripta
Volume	2016
Issue number	T167
DOIs	https://doi.org/10.1088/0031-8949/T167/1/014054
Publication status	Published - 22 Jan 2016
Event	15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015 - Aix-en-Provence, France Duration: 18 May 2015 → 22 May 2015

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10.1088/0031-8949/T167/1/014054

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title = "Investigation of He-W interactions using DiMES on DIII-D",

abstract = "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 s 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 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 s, ∼150 ELMs) discharge, similar to the bubble layer resulting from the 2000 s. 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 MJ m-2.",

keywords = "DIII-D, helium, tungsten",

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

note = "Publisher Copyright: {\textcopyright} 2016 The Royal Swedish Academy of Sciences.; 15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015 ; Conference date: 18-05-2015 Through 22-05-2015",

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TY - JOUR

T1 - Investigation of He-W interactions using DiMES on DIII-D

AU - Doerner, R. P.

AU - Rudakov, D. L.

AU - Chrobak, C. P.

AU - Briesemeister, A. R.

AU - Corr, C.

AU - De Temmerman, G.

AU - Kluth, P.

AU - Lasnier, C. J.

AU - McLean, A. G.

AU - Pace, D. C.

AU - Pitts, R. A.

AU - Schmitz, O.

AU - Thompson, M.

AU - Winters, V.

PY - 2016/1/22

Y1 - 2016/1/22

N2 - 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 s 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 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 s, ∼150 ELMs) discharge, similar to the bubble layer resulting from the 2000 s. 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 MJ m-2.

AB - 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 s 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 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 s, ∼150 ELMs) discharge, similar to the bubble layer resulting from the 2000 s. 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 MJ m-2.

KW - DIII-D

KW - helium

KW - tungsten

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U2 - 10.1088/0031-8949/T167/1/014054

DO - 10.1088/0031-8949/T167/1/014054

M3 - Article

SN - 0031-8949

VL - 2016

JO - Physica Scripta

JF - Physica Scripta

IS - T167

M1 - 014054

T2 - 15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015

Y2 - 18 May 2015 through 22 May 2015

ER -

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

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