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Removing of Mixed Coatings by Plasma Discharges

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Abstract

Next generation tokamaks offer the possibility of highly efficient energy generation from the fusion reaction of hydrogen isotopes. In tokamak operation, the core plasma interaction with the wall materials could produce tiles erosion. Redeposition of the eroded materials (C–W–Be) leads to an increase in the allowable tritium load if the coatings are not periodically removed. Amongst removal methods, plasma based techniques employing Ar, H2 gas have been investigated. Plasma cleaning has been carried out on hydrogenated carbon and carbon–tungsten coatings. It has been shown that at a RF power density of 1.3 W/cm2 (pressure of 1 Pa), the plasma cleaning was effective in removing the coatings. Details of further work in this research activity will be presented.

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Acknowledgments

This work, partially supported by the European Communities under the contract of Association EURATOM/ENEACNR, was carried out within the framework of EFDA (Task WP11-PWI-02-02-01/ENEACNR/BS). The views and opinions expressed here do not necessarily reflect those of the European Commission.

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Authors and Affiliations

  1. Istituto di Fisica del Plasma “P.Caldirola”, CNR, Milan, Italy

    E. Vassallo, R. Caniello, F. Ghezzi & L. Laguardia

  2. Dipartimento di Energia, Politecnico di Milano, Milan, Italy

    D. Dellasega & M. Passoni

  3. Istituto per l’Energetica e le Interfasi, CNR, Milan, Italy

    S. Deambrosis & E. Miorin

Authors
  1. E. Vassallo
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  2. R. Caniello
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  3. S. Deambrosis
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  4. D. Dellasega
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  5. F. Ghezzi
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  6. L. Laguardia
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  7. E. Miorin
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  8. M. Passoni
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Correspondence to E. Vassallo.

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Vassallo, E., Caniello, R., Deambrosis, S. et al. Removing of Mixed Coatings by Plasma Discharges. J Fusion Energ 32, 642–646 (2013). https://doi.org/10.1007/s10894-013-9623-z

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  • DOI: https://doi.org/10.1007/s10894-013-9623-z

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