Tracer techniques for the assessment of material migration and surface modification of plasma-facing components

M. Rubel; A. Weckmann; P. Ström; P. Petersson; A. Garcia-Carrasco; S. Brezinsek; J. Coenen; A. Kreter; S. Möller; P. Wienhold; T. Wauters; E. Fortuna-Zalëna

doi:10.1016/j.jnucmat.2014.11.074

Tracer techniques for the assessment of material migration and surface modification of plasma-facing components

M. Rubel, A. Weckmann, P. Ström, P. Petersson, A. Garcia-Carrasco, S. Brezinsek, J. Coenen, A. Kreter, S. Möller, P. Wienhold, T. Wauters, E. Fortuna-Zalëna

Laboratory for Plasma Physics

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

Abstract

Abstract Tracer techniques were used in the TEXTOR tokamak to determine high-Z metal migration and the deposition of species used for plasma edge cooling or wall conditioning under different types of operation conditions. Volatile molybdenum hexa-fluoride, nitrogen-15 and oxygen-18 were used as markers in tokamak or ion cyclotron wall conditioning discharges (ICWC). The objective was to obtain qualitative and quantitative of a global and local deposition pattern and material mixing effects. The deposition and retention was studied on plasma-facing components, collector probes and test limiters. Optical spectroscopy and ex-situ analysis techniques were used to determine the plasma response to tracer injection and the modification of surface composition. Molybdenum and light isotopes were detected on all types of limiters and short-term probes retrieved from the vessel showing that both helium and nitrogen are trapped following wall conditioning and edge cooling. Only small amounts below 1 × 10¹⁹ m^-2 of ¹⁸O were detected on surfaces treated by oxygen-assisted ICWC.

Original language	English
Article number	48668
Pages (from-to)	280-284
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.11.074
Publication status	Published - 22 Jul 2015

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Rubel, M., Weckmann, A., Ström, P., Petersson, P., Garcia-Carrasco, A., Brezinsek, S., Coenen, J., Kreter, A., Möller, S., Wienhold, P., Wauters, T., & Fortuna-Zalëna, E. (2015). Tracer techniques for the assessment of material migration and surface modification of plasma-facing components. Journal of Nuclear Materials, 463, 280-284. Article 48668. https://doi.org/10.1016/j.jnucmat.2014.11.074

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title = "Tracer techniques for the assessment of material migration and surface modification of plasma-facing components",

abstract = "Abstract Tracer techniques were used in the TEXTOR tokamak to determine high-Z metal migration and the deposition of species used for plasma edge cooling or wall conditioning under different types of operation conditions. Volatile molybdenum hexa-fluoride, nitrogen-15 and oxygen-18 were used as markers in tokamak or ion cyclotron wall conditioning discharges (ICWC). The objective was to obtain qualitative and quantitative of a global and local deposition pattern and material mixing effects. The deposition and retention was studied on plasma-facing components, collector probes and test limiters. Optical spectroscopy and ex-situ analysis techniques were used to determine the plasma response to tracer injection and the modification of surface composition. Molybdenum and light isotopes were detected on all types of limiters and short-term probes retrieved from the vessel showing that both helium and nitrogen are trapped following wall conditioning and edge cooling. Only small amounts below 1 × 1019 m-2 of 18O were detected on surfaces treated by oxygen-assisted ICWC.",

author = "M. Rubel and A. Weckmann and P. Str{\"o}m and P. Petersson and A. Garcia-Carrasco and S. Brezinsek and J. Coenen and A. Kreter and S. M{\"o}ller and P. Wienhold and T. Wauters and E. Fortuna-Zal{\"e}na",

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Rubel, M, Weckmann, A, Ström, P, Petersson, P, Garcia-Carrasco, A, Brezinsek, S, Coenen, J, Kreter, A, Möller, S, Wienhold, P, Wauters, T & Fortuna-Zalëna, E 2015, 'Tracer techniques for the assessment of material migration and surface modification of plasma-facing components', Journal of Nuclear Materials, vol. 463, 48668, pp. 280-284. https://doi.org/10.1016/j.jnucmat.2014.11.074

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T1 - Tracer techniques for the assessment of material migration and surface modification of plasma-facing components

AU - Rubel, M.

AU - Weckmann, A.

AU - Ström, P.

AU - Petersson, P.

AU - Garcia-Carrasco, A.

AU - Brezinsek, S.

AU - Coenen, J.

AU - Kreter, A.

AU - Möller, S.

AU - Wienhold, P.

AU - Wauters, T.

AU - Fortuna-Zalëna, E.

PY - 2015/7/22

Y1 - 2015/7/22

N2 - Abstract Tracer techniques were used in the TEXTOR tokamak to determine high-Z metal migration and the deposition of species used for plasma edge cooling or wall conditioning under different types of operation conditions. Volatile molybdenum hexa-fluoride, nitrogen-15 and oxygen-18 were used as markers in tokamak or ion cyclotron wall conditioning discharges (ICWC). The objective was to obtain qualitative and quantitative of a global and local deposition pattern and material mixing effects. The deposition and retention was studied on plasma-facing components, collector probes and test limiters. Optical spectroscopy and ex-situ analysis techniques were used to determine the plasma response to tracer injection and the modification of surface composition. Molybdenum and light isotopes were detected on all types of limiters and short-term probes retrieved from the vessel showing that both helium and nitrogen are trapped following wall conditioning and edge cooling. Only small amounts below 1 × 1019 m-2 of 18O were detected on surfaces treated by oxygen-assisted ICWC.

AB - Abstract Tracer techniques were used in the TEXTOR tokamak to determine high-Z metal migration and the deposition of species used for plasma edge cooling or wall conditioning under different types of operation conditions. Volatile molybdenum hexa-fluoride, nitrogen-15 and oxygen-18 were used as markers in tokamak or ion cyclotron wall conditioning discharges (ICWC). The objective was to obtain qualitative and quantitative of a global and local deposition pattern and material mixing effects. The deposition and retention was studied on plasma-facing components, collector probes and test limiters. Optical spectroscopy and ex-situ analysis techniques were used to determine the plasma response to tracer injection and the modification of surface composition. Molybdenum and light isotopes were detected on all types of limiters and short-term probes retrieved from the vessel showing that both helium and nitrogen are trapped following wall conditioning and edge cooling. Only small amounts below 1 × 1019 m-2 of 18O were detected on surfaces treated by oxygen-assisted ICWC.

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Tracer techniques for the assessment of material migration and surface modification of plasma-facing components

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