The detection of He in tungsten following ion implantation by laser-induced breakdown spectroscopy

G. Shaw; M. Bannister; T. M. Biewer; M. Z. Martin; F. Meyer; B. D. Wirth

doi:10.1016/j.apsusc.2017.08.180

The detection of He in tungsten following ion implantation by laser-induced breakdown spectroscopy

G. Shaw, M. Bannister, T. M. Biewer, M. Z. Martin, F. Meyer, B. D. Wirth

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

13 Scopus citations

Abstract

Laser-induced breakdown spectroscopy (LIBS) results are presented that provide depth-resolved identification of He implanted in polycrystalline tungsten (PC-W) targets by a 200 keV He+ ion beam, with a surface temperature of approximately 900 °C and a peak fluence of 10 ²³ m ⁻² . He retention, and the influence of He on deuterium and tritium recycling, permeation, and retention in PC-W plasma facing components are important questions for the divertor and plasma facing components in a fusion reactor, yet are difficult to quantify. The purpose of this work is to demonstrate the ability of LIBS to identify helium in tungsten; to investigate the sensitivity of laser parameters including, laser energy and gate delay, that directly influence the sensitivity and depth resolution of LIBS; and to perform a proof-of-principle experiment using LIBS to measure relative He intensities as a function of depth. The results presented demonstrate the potential not only to identify helium but also to develop a methodology to quantify gaseous impurity concentration in PC-W as a function of depth.

Original language	English
Pages (from-to)	695-703
Number of pages	9
Journal	Applied Surface Science
Volume	427
DOIs	https://doi.org/10.1016/j.apsusc.2017.08.180
State	Published - Jan 1 2018

Funding

The research was sponsored by the US Department of Energy Office of Fusion Energy Science under grant DE-AC05-00OR22725 with UT-Battelle LLC , and grant DOE-DE-SC0006661 with the University of Tennessee , Knoxville. This research was also sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory , managed by UT-Battelle, LLC, for the U.S. Department of Energy.

Funders	Funder number
US Department of Energy Office of Fusion Energy Science	DE-AC05-00OR22725
UT-Battelle LLC	DOE-DE-SC0006661
U.S. Department of Energy
Oak Ridge National Laboratory
University of Tennessee

Keywords

Helium retention in tungsten
Laser induced breakdown spectroscopy
Plasma facing components
Plasma material interactions

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.apsusc.2017.08.180

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title = "The detection of He in tungsten following ion implantation by laser-induced breakdown spectroscopy",

abstract = " Laser-induced breakdown spectroscopy (LIBS) results are presented that provide depth-resolved identification of He implanted in polycrystalline tungsten (PC-W) targets by a 200 keV He+ ion beam, with a surface temperature of approximately 900 °C and a peak fluence of 10 23 m −2 . He retention, and the influence of He on deuterium and tritium recycling, permeation, and retention in PC-W plasma facing components are important questions for the divertor and plasma facing components in a fusion reactor, yet are difficult to quantify. The purpose of this work is to demonstrate the ability of LIBS to identify helium in tungsten; to investigate the sensitivity of laser parameters including, laser energy and gate delay, that directly influence the sensitivity and depth resolution of LIBS; and to perform a proof-of-principle experiment using LIBS to measure relative He intensities as a function of depth. The results presented demonstrate the potential not only to identify helium but also to develop a methodology to quantify gaseous impurity concentration in PC-W as a function of depth.",

keywords = "Helium retention in tungsten, Laser induced breakdown spectroscopy, Plasma facing components, Plasma material interactions",

author = "G. Shaw and M. Bannister and Biewer, {T. M.} and Martin, {M. Z.} and F. Meyer and Wirth, {B. D.}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

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doi = "10.1016/j.apsusc.2017.08.180",

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T1 - The detection of He in tungsten following ion implantation by laser-induced breakdown spectroscopy

AU - Shaw, G.

AU - Bannister, M.

AU - Biewer, T. M.

AU - Martin, M. Z.

AU - Meyer, F.

AU - Wirth, B. D.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Laser-induced breakdown spectroscopy (LIBS) results are presented that provide depth-resolved identification of He implanted in polycrystalline tungsten (PC-W) targets by a 200 keV He+ ion beam, with a surface temperature of approximately 900 °C and a peak fluence of 10 23 m −2 . He retention, and the influence of He on deuterium and tritium recycling, permeation, and retention in PC-W plasma facing components are important questions for the divertor and plasma facing components in a fusion reactor, yet are difficult to quantify. The purpose of this work is to demonstrate the ability of LIBS to identify helium in tungsten; to investigate the sensitivity of laser parameters including, laser energy and gate delay, that directly influence the sensitivity and depth resolution of LIBS; and to perform a proof-of-principle experiment using LIBS to measure relative He intensities as a function of depth. The results presented demonstrate the potential not only to identify helium but also to develop a methodology to quantify gaseous impurity concentration in PC-W as a function of depth.

AB - Laser-induced breakdown spectroscopy (LIBS) results are presented that provide depth-resolved identification of He implanted in polycrystalline tungsten (PC-W) targets by a 200 keV He+ ion beam, with a surface temperature of approximately 900 °C and a peak fluence of 10 23 m −2 . He retention, and the influence of He on deuterium and tritium recycling, permeation, and retention in PC-W plasma facing components are important questions for the divertor and plasma facing components in a fusion reactor, yet are difficult to quantify. The purpose of this work is to demonstrate the ability of LIBS to identify helium in tungsten; to investigate the sensitivity of laser parameters including, laser energy and gate delay, that directly influence the sensitivity and depth resolution of LIBS; and to perform a proof-of-principle experiment using LIBS to measure relative He intensities as a function of depth. The results presented demonstrate the potential not only to identify helium but also to develop a methodology to quantify gaseous impurity concentration in PC-W as a function of depth.

KW - Helium retention in tungsten

KW - Laser induced breakdown spectroscopy

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KW - Plasma material interactions

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DO - 10.1016/j.apsusc.2017.08.180

M3 - Article

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EP - 703

JO - Applied Surface Science

JF - Applied Surface Science

ER -

The detection of He in tungsten following ion implantation by laser-induced breakdown spectroscopy

Abstract

Funding

Keywords

UN SDGs

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