Accelerating plasma and radiation surface science using transient grating spectroscopy
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023002_1_5.0232451.pdf
Description
Published version
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6.08 MB
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Checksum (MD5)
3934b94885a9165e0e1f2c0bb8f61efe
Author(s)
Wylie, APC
Woller, KB
Rae, M
Lanzrath, AT
Dacus, BR
Ferry, SE
Short, MP
Date Issued
February 11, 2025
Journal
Review of Scientific Instruments
Publisher
AIP Publishing
Citation
A. P. C. Wylie, K. B. Woller, M. Rae, A. T. Lanzrath, B. R. Dacus, S. E. Ferry, M. P. Short; Accelerating plasma and radiation surface science using transient grating spectroscopy. Rev. Sci. Instrum. 1 February 2025; 96 (2): 023002.
Version
Final published version
Abstract
A facility for the investigation of in situ radiation-materials and plasma-materials interaction is demonstrated with tungsten, using transient grating spectroscopy as a probe of thermal diffusivity and surface acoustic wave speed. Helium plasma exposure at 645 °C to 1.18 × 1018 cm−2 helium, until the growth of tungsten fuzz, showed an increase in surface acoustic wave speed at the near-surface from 2542 ± 1 m s−1 up to 2565 ± 1 m s−1, followed by a greater drop to 2499 ± 7 m s−1. No observable change in thermal diffusivity was present for plasma exposure alone. A separate 10.26 MeV self-ion-irradiation of tungsten to a dose of 7.92 dpa showed a reduction in both thermal diffusivity from 61.4 ± 1.4 mm2 s−1 to 36.0 ± 0.7 mm2 s−1, following trends seen in existing studies, and surface acoustic wave speed from 2647.8 ± 0.6 m s−1 to 2640.0 ± 0.4 m s−1. Facilities like these are poised to rapidly close critical knowledge gaps regarding the coupled effects of plasma and radiation damage for materials in fusion systems.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
https://doi.org/10.1063/5.0232451
