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

J. Beal; 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

doi: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

J. Beal^*
, 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

^*Corresponding author for this work

VTT Technical Research Centre of Finland

Culham Science Centre
University of York
University of Helsinki
Universidade de Lisboa
Forschungszentrum Jülich GmbH (FZJ)

Research output: Contribution to journal › Article › Scientific › peer-review

10 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 language	English
Pages (from-to)	818-821
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.09.069
Publication status	Published - 2015
MoE publication type	A1 Journal article-refereed

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SDG 7 Affordable and Clean Energy

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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., & JET-EFDA contributors (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

@article{aecf6957134e47cca9fde58fe1016b9f,

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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doi = "10.1016/j.jnucmat.2014.09.069",

language = "English",

volume = "463",

pages = "818--821",

journal = "Journal of Nuclear Materials",

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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 & JET-EFDA contributors 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

TY - JOUR

T1 - Analysis of rotating collectors from the private region of JET with carbon wall and metallic ITER-like wall

AU - Beal, J.

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 - JET-EFDA contributors

PY - 2015

Y1 - 2015

N2 - 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.

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.

U2 - 10.1016/j.jnucmat.2014.09.069

DO - 10.1016/j.jnucmat.2014.09.069

M3 - Article

SN - 0022-3115

VL - 463

SP - 818

EP - 821

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

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

Abstract

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