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DOE OSTI · 3683983

First in operando transient grating spectroscopy measurements on tungsten during high flux plasma operation in PISCES-RF

Simmonds, M. J. [University of California San Diego, La Jolla, CA (United States)] (ORCID:0000000322384386)·Založnik, A. [University of California San Diego, La Jolla, CA (United States)] (ORCID:0000000234887370)·Moore, S. [University of California San Diego, La Jolla, CA (United States)]·Nishijima, D. [University of California San Diego, La Jolla, CA (United States)] (ORCID:0000000231194827)·Patino, M. I. [University of California San Diego, La Jolla, CA (United States)] (ORCID:0000000226227110)·Dacus, B. [Massachusetts Institute of Technology, Cambridge, MA (United States)]·Lanzrath, A. [Massachusetts Institute of Technology, Cambridge, MA (United States)]·Short, M. P. [Massachusetts Institute of Technology, Cambridge, MA (United States)]·Woller, K. [Massachusetts Institute of Technology, Cambridge, MA (United States)] (ORCID:0000000204509731)·Wylie, A. [Massachusetts Institute of Technology, Cambridge, MA (United States)] (ORCID:0000000315715351)·Baldwin, M. J. [University of California San Diego, La Jolla, CA (United States)] (ORCID:0000000163352255)·Tynan, G. R. [University of California San Diego, La Jolla, CA (United States)]
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Abstract

This work details the construction and first in operando transient grating spectroscopy measurements conducted on PISCES-RF during plasma operation. A preliminary study on a tungsten sample with varied plasma species (Ar and D 2 ), ion flux (4 × 10 21 to 6 × 10 22 ion/m 2 /s), ion energy (5 to 80 eV), and surface temperature (20 to 200 °C) is presented. Prior to plasma exposure, the thermal diffusivity and surface acoustic wave (SAW) speed, (6.9 ± 0.2) × 10 −5 m 2 /s and (2.66 ± 0.02) km/s, were measured in situ with a thermal grating period of 12.5 μm. During Ar plasma exposure, these two quantities vary according to the sample surface temperature. At low flux and varied ion energy, D 2 plasma exposure also results in thermal diffusivity and SAW speed varying with surface temperature alone. At high flux, D 2 plasma exposure results in no convincing change to the thermal diffusivity, but the SAW speed is reduced. After returning to 20 °C, post plasma exposures, the thermal diffusivity and SAW speed almost recover to the initial value prior to exposure.

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Surface acoustic wave SAWThermal diffusivityTransient grating spectroscopy TGSTungsten W

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Simmonds, M. J. [University of California San Diego, La Jolla, CA (United States)] (ORCID:0000000322384386), Založnik, A. [University of California San Diego, La Jolla, CA (United States)] (ORCID:0000000234887370), Moore, S. [University of California San Diego, La Jolla, CA (United States)], Nishijima, D. [University of California San Diego, La Jolla, CA (United States)] (ORCID:0000000231194827), Patino, M. I. [University of California San Diego, La Jolla, CA (United States)] (ORCID:0000000226227110), Dacus, B. [Massachusetts Institute of Technology, Cambridge, MA (United States)], Lanzrath, A. [Massachusetts Institute of Technology, Cambridge, MA (United States)], Short, M. P. [Massachusetts Institute of Technology, Cambridge, MA (United States)], Woller, K. [Massachusetts Institute of Technology, Cambridge, MA (United States)] (ORCID:0000000204509731), Wylie, A. [Massachusetts Institute of Technology, Cambridge, MA (United States)] (ORCID:0000000315715351), Baldwin, M. J. [University of California San Diego, La Jolla, CA (United States)] (ORCID:0000000163352255), Tynan, G. R. [University of California San Diego, La Jolla, CA (United States)]. 2025-06-01. First in operando transient grating spectroscopy measurements on tungsten during high flux plasma operation in PISCES-RF. https://doi.org/10.1016/j.nme.2025.101911

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Surface acoustic wave SAW subjectThermal diffusivity subjectTransient grating spectroscopy TGS subjectTungsten W subject

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