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",
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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