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Application of the penning discharge for cleaning mirrors in optical diagnostics of the ITER

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Abstract

The possibility of using the reflective gas discharge at a direct current (DC) in a strong uniform magnetic field for cleaning mirrors in optical diagnostics of the ITER is studied. A mirror and an additional Penning-type electrode, which was shifted along the magnetic field, were used as sputtered cathodes forming the discharge cell. The experiments were performed in gaseous He, in a magnetic field of up to 0.5 T at a discharge voltage of up to 750 V. Mo, Al and Mo mirrors with an Al coating, simulating a Be impurity, were used as materials of the cathodes. It is shown that this system efficiently cleans Mo mirrors from Al films with a thickness of up to 200 nm, recovering the initial optical properties of the mirror. Integration versions of cleaning systems of this type into the first-mirror assembly for the ITER are proposed for the example of Hα diagnostics.

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Authors and Affiliations

  1. National Research Centre “Kurchatov Institute”, pl. Akademika Kurchatova 1, Moscow, 123182, Russia

    A. V. Rogov, Yu. V. Kapustin & A. G. Alekseev

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  1. A. V. Rogov
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  2. Yu. V. Kapustin
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  3. A. G. Alekseev
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Correspondence to A. V. Rogov.

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Original Russian Text © A.V. Rogov, Yu.V. Kapustin, A.G. Alekseev, 2015, published in Pribory i Tekhnika Eksperimenta, 2015, No. 1, pp. 168–174.

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Rogov, A.V., Kapustin, Y.V. & Alekseev, A.G. Application of the penning discharge for cleaning mirrors in optical diagnostics of the ITER. Instrum Exp Tech 58, 161–166 (2015). https://doi.org/10.1134/S0020441214060104

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  • DOI: https://doi.org/10.1134/S0020441214060104

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