Motion of W and He atoms during formation of W fuzz
Abstract
Measurements are conducted to identify the motion of tungsten and helium atoms during the formation of tungsten fuzz. In a first series of experiments the mobility of helium within the growing fuzz was measured by adding 3He to the different stages of plasma exposure under conditions that promoted tungsten fuzz growth. Ion beam analysis was used to quantify the amount of 3He remaining in the samples following the plasma exposure. The results indicate that the retention of helium in bubbles within tungsten is a dynamic process with direct implantation rather than diffusion into the bubbles, best describing the motion of the helium atoms. In the second experiment, an isotopically enriched layer of tungsten (~92.99% 182W) is deposited on the surface of a bulk tungsten sample with the natural abundance of the isotopes. This sample is then exposed to helium plasma at the conditions necessary to support the formation of tungsten 'fuzz'. Depth profiles of the concentration of each of the tungsten isotopes are obtained using secondary ion mass spectrometry (SIMS) before and after the plasma exposure. The depth profiles clearly show mixing of tungsten atoms from the bulk sample toward the surface of the fuzz. Lastly, this supports a physicalmore »
- Authors:
-
- Univ. of California, San Diego, CA (United States). Center for Energy Research
- Max-Planck Inst. fur Plasmaphysik, Garching, (Germany)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Fusion Energy Sciences (FES); European Union (EU)
- OSTI Identifier:
- 1435242
- Grant/Contract Number:
- AC05-00OR22725; FG02-07ER54912; SC0018302
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 6; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma-material interaction; tungsten fuzz; helium nano-bubbles
Citation Formats
Doerner, R. P., Nishijima, D., Krasheninnikov, S. I., Schwarz-Selinger, T., and Zach, M. Motion of W and He atoms during formation of W fuzz. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aab96a.
Doerner, R. P., Nishijima, D., Krasheninnikov, S. I., Schwarz-Selinger, T., & Zach, M. Motion of W and He atoms during formation of W fuzz. United States. https://doi.org/10.1088/1741-4326/aab96a
Doerner, R. P., Nishijima, D., Krasheninnikov, S. I., Schwarz-Selinger, T., and Zach, M. Wed .
"Motion of W and He atoms during formation of W fuzz". United States. https://doi.org/10.1088/1741-4326/aab96a. https://www.osti.gov/servlets/purl/1435242.
@article{osti_1435242,
title = {Motion of W and He atoms during formation of W fuzz},
author = {Doerner, R. P. and Nishijima, D. and Krasheninnikov, S. I. and Schwarz-Selinger, T. and Zach, M.},
abstractNote = {Measurements are conducted to identify the motion of tungsten and helium atoms during the formation of tungsten fuzz. In a first series of experiments the mobility of helium within the growing fuzz was measured by adding 3He to the different stages of plasma exposure under conditions that promoted tungsten fuzz growth. Ion beam analysis was used to quantify the amount of 3He remaining in the samples following the plasma exposure. The results indicate that the retention of helium in bubbles within tungsten is a dynamic process with direct implantation rather than diffusion into the bubbles, best describing the motion of the helium atoms. In the second experiment, an isotopically enriched layer of tungsten (~92.99% 182W) is deposited on the surface of a bulk tungsten sample with the natural abundance of the isotopes. This sample is then exposed to helium plasma at the conditions necessary to support the formation of tungsten 'fuzz'. Depth profiles of the concentration of each of the tungsten isotopes are obtained using secondary ion mass spectrometry (SIMS) before and after the plasma exposure. The depth profiles clearly show mixing of tungsten atoms from the bulk sample toward the surface of the fuzz. Lastly, this supports a physical picture of the dynamic behavior of helium bubbles which, also, causes an enhanced mixing of tungsten atoms.},
doi = {10.1088/1741-4326/aab96a},
journal = {Nuclear Fusion},
number = 6,
volume = 58,
place = {United States},
year = {Wed Apr 11 00:00:00 EDT 2018},
month = {Wed Apr 11 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
Plasma-Material-Interaction Research Using PISCES Linear Plasma Devices
journal, October 2019
- Baldwin, M. J.; Doerner, R. P.; Nishijima, D.
- Fusion Science and Technology, Vol. 75, Issue 7
The evolution of He nanobubbles in tungsten under fusion-relevant He ion irradiation conditions
journal, June 2019
- Bi, Zhenhua; Liu, Dongping; Zhang, Yang
- Nuclear Fusion, Vol. 59, Issue 8