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

    Research output: Contribution to journalArticleScientificpeer-review

    25 Citations (Scopus)

    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

    Fingerprint

    tiles
    Tile
    cleaning
    Cleaning
    Photons
    photons
    pulses
    flash lamps
    Tritium
    Deuterium
    tritium
    Electric lamps
    deuterium
    Deposits
    deposits
    energy
    cross sections
    Experiments

    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., ... 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
    Widdowson, A. ; Coad, J.P. ; Bekris, N. ; Counsell, G., ; Forrest, M.J. ; Gibson, K.J. ; Hole, D. ; Jari, Likonen ; Parsons, W. ; Renvall, Tommi ; Rubel, M. / Efficacy of photon cleaning of JET divertor tiles. In: Journal of Nuclear Materials. 2007 ; Vol. 363-365. pp. 341-345.
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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.",
    keywords = "desorption, tritium, deuterium inventory, surface analysis, divertor, JET, ITER, fusion energy, plasma",
    author = "A. Widdowson and J.P. Coad and N. Bekris and G., Counsell and M.J. Forrest and K.J. Gibson and D. Hole and Likonen Jari and W. Parsons and Tommi Renvall and M. Rubel",
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    Widdowson, A, Coad, JP, Bekris, N, Counsell, G, Forrest, MJ, Gibson, KJ, Hole, D, Jari, L, Parsons, W, Renvall, T & Rubel, M 2007, 'Efficacy of photon cleaning of JET divertor tiles', Journal of Nuclear Materials, vol. 363-365, pp. 341-345. https://doi.org/10.1016/j.jnucmat.2007.01.030

    Efficacy of photon cleaning of JET divertor tiles. / Widdowson, A.; Coad, J.P.; Bekris, N.; Counsell, G.,; Forrest, M.J.; Gibson, K.J.; Hole, D.; Jari, Likonen; Parsons, W.; Renvall, Tommi; Rubel, M.

    In: Journal of Nuclear Materials, Vol. 363-365, 2007, p. 341-345.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Efficacy of photon cleaning of JET divertor tiles

    AU - Widdowson, A.

    AU - Coad, J.P.

    AU - Bekris, N.

    AU - Counsell, G.,

    AU - Forrest, M.J.

    AU - Gibson, K.J.

    AU - Hole, D.

    AU - Jari, Likonen

    AU - Parsons, W.

    AU - Renvall, Tommi

    AU - Rubel, M.

    PY - 2007

    Y1 - 2007

    N2 - 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.

    AB - 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.

    KW - desorption

    KW - tritium

    KW - deuterium inventory

    KW - surface analysis

    KW - divertor

    KW - JET

    KW - ITER

    KW - fusion energy

    KW - plasma

    U2 - 10.1016/j.jnucmat.2007.01.030

    DO - 10.1016/j.jnucmat.2007.01.030

    M3 - Article

    VL - 363-365

    SP - 341

    EP - 345

    JO - Journal of Nuclear Materials

    JF - Journal of Nuclear Materials

    SN - 0022-3115

    ER -

    Widdowson A, Coad JP, Bekris N, Counsell G, Forrest MJ, Gibson KJ et al. Efficacy of photon cleaning of JET divertor tiles. Journal of Nuclear Materials. 2007;363-365:341-345. https://doi.org/10.1016/j.jnucmat.2007.01.030