Efficacy of photon cleaning of JET divertor tiles

A. Widdowson, J.P. Coad, N. Bekris, G., Counsell, M.J. Forrest, K.J. Gibson, D. Hole, Likonen Jari, W. Parsons, Tommi Renvall, M. Rubel

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    Abstract

    Photon cleaning by means of a flash-lamp was used for in-situ detritiation of the inner wall tiles of the JET divertor in May 2004.
    Additional trials were also performed ex-situ in October 2004 on divertor base tiles. Early work confirmed that for pulse energies between 150 J and 300 J some deposited material was removed. To increase the amount of material removed during photon cleaning, further experiments with higher pulse energies (500 J) were performed and are reported here.
    Analysis of cross sections confirmed a removal rate of 0.04 μm/pulse, removing ∼80 μm from 200 μm thick deposits over a treatment area of 15 × 10−4 m2.
    During the photon cleaning tests at least 12% of the tritium inventory for the tile was removed. It was also shown that deuterium was desorbed from a depth ∼7 μm beyond the depth of material removed.
    Original languageEnglish
    Pages (from-to)341-345
    JournalJournal of Nuclear Materials
    Volume363-365
    DOIs
    Publication statusPublished - 2007
    MoE publication typeA1 Journal article-refereed

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    Keywords

    • desorption
    • tritium
    • deuterium inventory
    • surface analysis
    • divertor
    • JET
    • ITER
    • fusion energy
    • plasma

    Cite this

    Widdowson, A., Coad, J. P., Bekris, N., Counsell, G. ., Forrest, M. J., Gibson, K. J., Hole, D., Jari, L., Parsons, W., Renvall, T., & Rubel, M. (2007). Efficacy of photon cleaning of JET divertor tiles. Journal of Nuclear Materials, 363-365, 341-345. https://doi.org/10.1016/j.jnucmat.2007.01.030