Abstract
A technique based on laser-induced breakdown spectroscopy (LIBS) is proposed for detecting in-situ dust on the plasma-exposed surfaces and in the grooves of plasmafacing components in the next-generation of fusion devices (e.g., ITER-FEAT). It is based on laser-induced ablation of wall material and spectral analysis of the laser spark flash-light collected by imaging optics and transmitted to the detection system. This could give space- and time-resolved information on the presence of dust, or loosely bound films, their characteristic deposition patterns, elemental composition, and possibly their hydrogen content, without the necessity of breaking the machine vacuum. We have performed some simple proof-of-principle experiments to demonstrate the suitability of this technique, which might provide an effective non-intrusive in-situ surface analysis method for surveying in-vessel dust accumulation in future fusion devices.
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Kozhevin, V.M., Mukhin, E.E., Razdobarin, G.T., Semenov, V.V., Tolstyakov, S.Y., Federici, G. (2002). Laser Induced Breakdown Spectroscopy Technique For In-Situ Dust Detecting In A Next-Step Tokamak. In: Hassanein, A. (eds) Hydrogen and Helium Recycling at Plasma Facing Materials. NATO Science Series, vol 54. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0444-2_22
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DOI: https://doi.org/10.1007/978-94-010-0444-2_22
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