Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall

H. Bergsåker; I. Bykov; P. Petersson; G. Possnert; Jari Likonen; Seppo Koivuranta; J.P. Coad; W. van Renterghem; I. Uytdenhouwen; A.M. Widdowson; JET-EFDA contributors

doi:10.1016/j.jnucmat.2014.12.015

Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall

H. Bergsåker^*
, I. Bykov
, P. Petersson
, G. Possnert
, Jari Likonen
, Seppo Koivuranta
, J.P. Coad
, W. van Renterghem
, I. Uytdenhouwen
, A.M. Widdowson
, JET-EFDA contributors

^*Corresponding author for this work

Culham Science Centre
KTH Royal Institute of Technology
Uppsala University
VTT (former employee or external)
Belgian Nuclear Research Centre (SCK CEN)

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

16 Citations (Scopus)

Abstract

The divertor surfaces in JET with ITER-like wall (ILW) have been studied using micro ion beam analysis (u-IBA) methods and scanning electron microscopy (SEM). Deposited layers with beryllium as main constituent had been formed during plasma operations through 2011-2012. The deuterium trapping and impurity deposition were non-uniform, frequently enhanced within pits, cracks and valleys, regions reaching in size from 10 um to 200 um. The impurity deposition and fuel retention were correlated with the surface slope with respect to the direction of ion incidence. Typically more than 70% of the total measured areal density of trapped D was found in less than 30% of the surface area. This is of consequence for the interpretation of other surface analyses and in extrapolation from fuel retention in JET with ITERlike wall and rough divertor surfaces to ITER with smoother surfaces.

Original language	English
Pages (from-to)	956-960
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.12.015
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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10.1016/j.jnucmat.2014.12.015

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Bergsåker, H., Bykov, I., Petersson, P., Possnert, G., Likonen, J., Koivuranta, S., Coad, J. P., van Renterghem, W., Uytdenhouwen, I., Widdowson, A. M., & JET-EFDA contributors (2015). Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall. Journal of Nuclear Materials, 463, 956-960. https://doi.org/10.1016/j.jnucmat.2014.12.015

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title = "Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall",

abstract = "The divertor surfaces in JET with ITER-like wall (ILW) have been studied using micro ion beam analysis (u-IBA) methods and scanning electron microscopy (SEM). Deposited layers with beryllium as main constituent had been formed during plasma operations through 2011-2012. The deuterium trapping and impurity deposition were non-uniform, frequently enhanced within pits, cracks and valleys, regions reaching in size from 10 um to 200 um. The impurity deposition and fuel retention were correlated with the surface slope with respect to the direction of ion incidence. Typically more than 70\% of the total measured areal density of trapped D was found in less than 30\% of the surface area. This is of consequence for the interpretation of other surface analyses and in extrapolation from fuel retention in JET with ITERlike wall and rough divertor surfaces to ITER with smoother surfaces.",

author = "H. Bergs{\aa}ker and I. Bykov and P. Petersson and G. Possnert and Jari Likonen and Seppo Koivuranta and J.P. Coad and \{van Renterghem\}, W. and I. Uytdenhouwen and A.M. Widdowson and \{JET-EFDA contributors\}",

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doi = "10.1016/j.jnucmat.2014.12.015",

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journal = "Journal of Nuclear Materials",

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Bergsåker, H, Bykov, I, Petersson, P, Possnert, G, Likonen, J, Koivuranta, S, Coad, JP, van Renterghem, W, Uytdenhouwen, I, Widdowson, AM & JET-EFDA contributors 2015, 'Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall', Journal of Nuclear Materials, vol. 463, pp. 956-960. https://doi.org/10.1016/j.jnucmat.2014.12.015

TY - JOUR

T1 - Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall

AU - Bergsåker, H.

AU - Bykov, I.

AU - Petersson, P.

AU - Possnert, G.

AU - Likonen, Jari

AU - Koivuranta, Seppo

AU - Coad, J.P.

AU - van Renterghem, W.

AU - Uytdenhouwen, I.

AU - Widdowson, A.M.

AU - JET-EFDA contributors

N1 - Project code: 104445

PY - 2015

Y1 - 2015

N2 - The divertor surfaces in JET with ITER-like wall (ILW) have been studied using micro ion beam analysis (u-IBA) methods and scanning electron microscopy (SEM). Deposited layers with beryllium as main constituent had been formed during plasma operations through 2011-2012. The deuterium trapping and impurity deposition were non-uniform, frequently enhanced within pits, cracks and valleys, regions reaching in size from 10 um to 200 um. The impurity deposition and fuel retention were correlated with the surface slope with respect to the direction of ion incidence. Typically more than 70% of the total measured areal density of trapped D was found in less than 30% of the surface area. This is of consequence for the interpretation of other surface analyses and in extrapolation from fuel retention in JET with ITERlike wall and rough divertor surfaces to ITER with smoother surfaces.

AB - The divertor surfaces in JET with ITER-like wall (ILW) have been studied using micro ion beam analysis (u-IBA) methods and scanning electron microscopy (SEM). Deposited layers with beryllium as main constituent had been formed during plasma operations through 2011-2012. The deuterium trapping and impurity deposition were non-uniform, frequently enhanced within pits, cracks and valleys, regions reaching in size from 10 um to 200 um. The impurity deposition and fuel retention were correlated with the surface slope with respect to the direction of ion incidence. Typically more than 70% of the total measured areal density of trapped D was found in less than 30% of the surface area. This is of consequence for the interpretation of other surface analyses and in extrapolation from fuel retention in JET with ITERlike wall and rough divertor surfaces to ITER with smoother surfaces.

UR - https://www.sciencedirect.com/journal/journal-of-nuclear-materials/vol/463/suppl/C

U2 - 10.1016/j.jnucmat.2014.12.015

DO - 10.1016/j.jnucmat.2014.12.015

M3 - Article

SN - 0022-3115

VL - 463

SP - 956

EP - 960

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall

Abstract

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