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

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. In conclusion, 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.
Authors:
 [1] ; ORCiD logo [2] ; ORCiD logo [3] ; ORCiD logo [3] ;  [2] ;  [3]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Applied Surface Science
Additional Journal Information:
Journal Volume: 427; Journal Issue: PB; Journal ID: ISSN 0169-4332
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Laser induced breakdown spectroscopy; Plasma material interactions; Plasma facing components; Helium retention in tungsten
OSTI Identifier:
1439159

Shaw, Guinevere C., Bannister, Mark E., Biewer, Theodore M., Martin, Madhavi Z., Meyer, Fred W., and Wirth, Brian D.. The detection of He in tungsten following ion implantation by laser-induced breakdown spectroscopy. United States: N. p., Web. doi:10.1016/j.apsusc.2017.08.180.
Shaw, Guinevere C., Bannister, Mark E., Biewer, Theodore M., Martin, Madhavi Z., Meyer, Fred W., & Wirth, Brian D.. The detection of He in tungsten following ion implantation by laser-induced breakdown spectroscopy. United States. doi:10.1016/j.apsusc.2017.08.180.
Shaw, Guinevere C., Bannister, Mark E., Biewer, Theodore M., Martin, Madhavi Z., Meyer, Fred W., and Wirth, Brian D.. 2017. "The detection of He in tungsten following ion implantation by laser-induced breakdown spectroscopy". United States. doi:10.1016/j.apsusc.2017.08.180. https://www.osti.gov/servlets/purl/1439159.
@article{osti_1439159,
title = {The detection of He in tungsten following ion implantation by laser-induced breakdown spectroscopy},
author = {Shaw, Guinevere C. and Bannister, Mark E. and Biewer, Theodore M. and Martin, Madhavi Z. and Meyer, Fred W. and Wirth, Brian D.},
abstractNote = {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 1023 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. In conclusion, 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.},
doi = {10.1016/j.apsusc.2017.08.180},
journal = {Applied Surface Science},
number = PB,
volume = 427,
place = {United States},
year = {2017},
month = {9}
}