TY - JOUR
T1 - Loading of deuterium and helium by Pilot-PSI plasma and their detection by in-situ LIBS
AU - Piip, K.
AU - van der Meiden, H.J.
AU - Bystrov, K.
AU - Hämarik, L.
AU - Karhunen, J.
AU - Aints, M.
AU - Laan, M.
AU - Paris, P.
AU - Seemen, H.
AU - Hakola, Antti
AU - Brezinsek, S.
N1 - Funding Information:
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014 – 2018 under grant agreement No 633053 . The views and opinions expressed herein do not necessarily reflect those of the European Commission.
Funding Information:
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014?2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
Publisher Copyright:
© 2017 The Authors
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/8/1
Y1 - 2017/8/1
N2 - Laser-induced breakdown spectroscopy (LIBS) is a promising method for quantifying the fuel content of the plasma-facing components of ITER both in between plasma discharges (in-situ. ) and after maintenance operations. The aim of the present study is to test the applicability of in-situ LIBS for monitoring deuterium (D) and helium (He) content of W samples exposed to fusion relevant plasma fluxes in the linear plasma device Pilot-PSI. The D loading was performed during 1000 s of plasma exposure at low (200-300° C) surface temperatures. Despite of low intensity and noisy LIBS spectra, H and D lines, at 656.1 and 656.3 nm, respectively, could be fitted with Lorentzian contours and reliably resolved at 1.2 mbar background pressure of argon. In the case of He loading, the samples were also exposed to plasma during 1000 s while the surface temperature reached values up to 720° C at the center. Already at 10-2 mbar residual pressure of the device, the He I line at 587.6 nm was visible for the first 2-3 laser shots. We demonstrated that in-situ LIBS is a reliable method for detection of He and D retention in ITER-relevant materials. Nevertheless, for measuring relative and absolute concentrations of D and He in the ITER-relevant samples, further studies are needed.
AB - Laser-induced breakdown spectroscopy (LIBS) is a promising method for quantifying the fuel content of the plasma-facing components of ITER both in between plasma discharges (in-situ. ) and after maintenance operations. The aim of the present study is to test the applicability of in-situ LIBS for monitoring deuterium (D) and helium (He) content of W samples exposed to fusion relevant plasma fluxes in the linear plasma device Pilot-PSI. The D loading was performed during 1000 s of plasma exposure at low (200-300° C) surface temperatures. Despite of low intensity and noisy LIBS spectra, H and D lines, at 656.1 and 656.3 nm, respectively, could be fitted with Lorentzian contours and reliably resolved at 1.2 mbar background pressure of argon. In the case of He loading, the samples were also exposed to plasma during 1000 s while the surface temperature reached values up to 720° C at the center. Already at 10-2 mbar residual pressure of the device, the He I line at 587.6 nm was visible for the first 2-3 laser shots. We demonstrated that in-situ LIBS is a reliable method for detection of He and D retention in ITER-relevant materials. Nevertheless, for measuring relative and absolute concentrations of D and He in the ITER-relevant samples, further studies are needed.
KW - plasma surface interaction
KW - LIBS
KW - fuel retention
KW - tungsten
UR - http://www.scopus.com/inward/record.url?scp=85014795209&partnerID=8YFLogxK
U2 - 10.1016/j.nme.2016.12.034
DO - 10.1016/j.nme.2016.12.034
M3 - Article
SN - 2352-1791
VL - 12
SP - 694
EP - 698
JO - Nuclear Materials and Energy
JF - Nuclear Materials and Energy
T2 - 22nd International Conference on Plasma-Surface Interactions in Controlled Fusion Devices (PSI-22)
Y2 - 30 May 2016 through 3 June 2016
ER -