Analysis of rotating collectors from the private region of JET with carbon wall and metallic ITER-like wall

J. Beal (Corresponding Author), A. Widdowson, K. Heinola, A. Baron-Wiechec, K.J. Gibson, J.P. Coad, E. Alves, B. Lipschultz, A. Kirschner, G.F. Matthews, S. Brezinsek, JET-EFDA Contributors

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Rotating collectors are used in JET to provide time-resolved measurements of erosion and redeposition of vessel materials. The silicon collecting discs rotate behind an aperture, driven by pulsing of the toroidal magnetic field, with the deposits analysed ex-situ by nuclear reaction analysis. The angular dependence of deposition is mapped to discharge number using the B-field history, allowing the influence of different plasma configurations and parameters to be investigated. A simple geometrical model using sputtering and reflection from the strike point has qualitatively reproduced the deposition found on collectors located under the central divertor tile and facing towards the inner strike point. The beryllium deposition on the ITER-like wall (ILW) collector showed an order of magnitude reduction in deposition compared to carbon deposition on the JET-C collector. This decreased deposition is attributed to low long range divertor transport due to reduced chemical sputtering/erosion and codeposition of beryllium relative to carbon.
Original languageEnglish
Pages (from-to)818-821
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

accumulators
Carbon
carbon
Beryllium
beryllium
erosion
Sputtering
Erosion
sputtering
Nuclear reactions
tiles
Silicon
Tile
Time measurement
nuclear reactions
vessels
Deposits
apertures
deposits
time measurement

Cite this

Beal, J., Widdowson, A., Heinola, K., Baron-Wiechec, A., Gibson, K. J., Coad, J. P., ... Contributors, JET-EFDA. (2015). Analysis of rotating collectors from the private region of JET with carbon wall and metallic ITER-like wall. Journal of Nuclear Materials, 463, 818-821. https://doi.org/10.1016/j.jnucmat.2014.09.069
Beal, J. ; Widdowson, A. ; Heinola, K. ; Baron-Wiechec, A. ; Gibson, K.J. ; Coad, J.P. ; Alves, E. ; Lipschultz, B. ; Kirschner, A. ; Matthews, G.F. ; Brezinsek, S. ; Contributors, JET-EFDA. / Analysis of rotating collectors from the private region of JET with carbon wall and metallic ITER-like wall. In: Journal of Nuclear Materials. 2015 ; Vol. 463. pp. 818-821.
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title = "Analysis of rotating collectors from the private region of JET with carbon wall and metallic ITER-like wall",
abstract = "Rotating collectors are used in JET to provide time-resolved measurements of erosion and redeposition of vessel materials. The silicon collecting discs rotate behind an aperture, driven by pulsing of the toroidal magnetic field, with the deposits analysed ex-situ by nuclear reaction analysis. The angular dependence of deposition is mapped to discharge number using the B-field history, allowing the influence of different plasma configurations and parameters to be investigated. A simple geometrical model using sputtering and reflection from the strike point has qualitatively reproduced the deposition found on collectors located under the central divertor tile and facing towards the inner strike point. The beryllium deposition on the ITER-like wall (ILW) collector showed an order of magnitude reduction in deposition compared to carbon deposition on the JET-C collector. This decreased deposition is attributed to low long range divertor transport due to reduced chemical sputtering/erosion and codeposition of beryllium relative to carbon.",
author = "J. Beal and A. Widdowson and K. Heinola and A. Baron-Wiechec and K.J. Gibson and J.P. Coad and E. Alves and B. Lipschultz and A. Kirschner and G.F. Matthews and S. Brezinsek and JET-EFDA Contributors",
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Beal, J, Widdowson, A, Heinola, K, Baron-Wiechec, A, Gibson, KJ, Coad, JP, Alves, E, Lipschultz, B, Kirschner, A, Matthews, GF, Brezinsek, S & Contributors, JET-EFDA 2015, 'Analysis of rotating collectors from the private region of JET with carbon wall and metallic ITER-like wall', Journal of Nuclear Materials, vol. 463, pp. 818-821. https://doi.org/10.1016/j.jnucmat.2014.09.069

Analysis of rotating collectors from the private region of JET with carbon wall and metallic ITER-like wall. / Beal, J. (Corresponding Author); Widdowson, A.; Heinola, K.; Baron-Wiechec, A.; Gibson, K.J.; Coad, J.P.; Alves, E.; Lipschultz, B.; Kirschner, A.; Matthews, G.F.; Brezinsek, S.; Contributors, JET-EFDA.

In: Journal of Nuclear Materials, Vol. 463, 2015, p. 818-821.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Widdowson, A.

AU - Heinola, K.

AU - Baron-Wiechec, A.

AU - Gibson, K.J.

AU - Coad, J.P.

AU - Alves, E.

AU - Lipschultz, B.

AU - Kirschner, A.

AU - Matthews, G.F.

AU - Brezinsek, S.

AU - Contributors, JET-EFDA

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AB - Rotating collectors are used in JET to provide time-resolved measurements of erosion and redeposition of vessel materials. The silicon collecting discs rotate behind an aperture, driven by pulsing of the toroidal magnetic field, with the deposits analysed ex-situ by nuclear reaction analysis. The angular dependence of deposition is mapped to discharge number using the B-field history, allowing the influence of different plasma configurations and parameters to be investigated. A simple geometrical model using sputtering and reflection from the strike point has qualitatively reproduced the deposition found on collectors located under the central divertor tile and facing towards the inner strike point. The beryllium deposition on the ITER-like wall (ILW) collector showed an order of magnitude reduction in deposition compared to carbon deposition on the JET-C collector. This decreased deposition is attributed to low long range divertor transport due to reduced chemical sputtering/erosion and codeposition of beryllium relative to carbon.

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