Tritium distributions on W-coated divertor tiles used in the third JET ITER-like wall campaign

Hatano, Y.; Lee, S. E.; Likonen, J.; Koivuranta, S.; Hara, M.; Masuzaki, S.; Asakura, N.; Isobe, K.; Hayashi, T.; Ikonen, J.; Widdowson, A.

doi:10.1016/j.nme.2019.01.001

Title: Tritium distributions on W-coated divertor tiles used in the third JET ITER-like wall campaign

Abstract

Tritium (T) distributions on tungsten (W)-coated plasma-facing tiles used in the third ITER-like wall campaign (2015–2016) of the Joint European Torus (JET) were examined by means of an imaging plate technique and β-ray induced x-ray spectrometry, and they were compared with the distributions after the second (2013–2014) campaign. Strong enrichment of T in beryllium (Be) deposition layers was observed after the second campaign. In contrast, T distributions after the third campaign was more uniform though Be deposition layers were visually recognized. The one of the possible explanations is enhanced desorption of T from Be deposition layers due to higher tile temperatures caused by higher energy input in the third campaign.

Authors:

Hatano, Y. ^[1]; Lee, S. E. ^[1]; Likonen, J. ^[2]; Koivuranta, S. ^[2];

^[1]; Masuzaki, S. ^[3]; Asakura, N. ^[4]; Isobe, K. ^[4]; Hayashi, T. ^[4];

^[5]; Widdowson, A. ^[6]

Univ. of Toyama, Gofuku (Japan)
VTT Technical Research Centre of Finland, Espoo (Finland)
National Inst. for Fusion Science (NIFS), Toki (Japan)
National Inst. for Quantum and Radiological Science and Technology, Rokkasho (Japan)
Univ. of Helsinki (Finland)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)

Publication Date:: Wed Jan 16 00:00:00 EST 2019

Research Org.:: Culham Science Centre, Abingdon (United Kingdom); Univ. of Helsinki (Finland); Univ. of Toyama, Gofuku (Japan); National Inst. for Fusion Science (NIFS), Toki (Japan)

Sponsoring Org.:: European Commission (EC); Japan Society for the Promotion of Science (JSPS)

OSTI Identifier:: 1502353

Grant/Contract Number:: 633053; JP26289353

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Materials and Energy

Additional Journal Information:: Journal Volume: 18; Journal ID: ISSN 2352-1791

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; divertor; tritium; retention; deposition; radiation

Citation Formats


                    Hatano, Y., Lee, S. E., Likonen, J., Koivuranta, S., Hara, M., Masuzaki, S., Asakura, N., Isobe, K., Hayashi, T., Ikonen, J., and Widdowson, A. Tritium distributions on W-coated divertor tiles used in the third JET ITER-like wall campaign.  United States: N. p., 2019. 
Web.  doi:10.1016/j.nme.2019.01.001.

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                    Hatano, Y., Lee, S. E., Likonen, J., Koivuranta, S., Hara, M., Masuzaki, S., Asakura, N., Isobe, K., Hayashi, T., Ikonen, J., & Widdowson, A. Tritium distributions on W-coated divertor tiles used in the third JET ITER-like wall campaign.  United States.  https://doi.org/10.1016/j.nme.2019.01.001

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                    Hatano, Y., Lee, S. E., Likonen, J., Koivuranta, S., Hara, M., Masuzaki, S., Asakura, N., Isobe, K., Hayashi, T., Ikonen, J., and Widdowson, A. Wed .  
"Tritium distributions on W-coated divertor tiles used in the third JET ITER-like wall campaign".  United States.  https://doi.org/10.1016/j.nme.2019.01.001.  https://www.osti.gov/servlets/purl/1502353.

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@article{osti_1502353,

  title        = {Tritium distributions on W-coated divertor tiles used in the third JET ITER-like wall campaign},

  author       = {Hatano, Y. and Lee, S. E. and Likonen, J. and Koivuranta, S. and Hara, M. and Masuzaki, S. and Asakura, N. and Isobe, K. and Hayashi, T. and Ikonen, J. and Widdowson, A.},

  abstractNote = {Tritium (T) distributions on tungsten (W)-coated plasma-facing tiles used in the third ITER-like wall campaign (2015–2016) of the Joint European Torus (JET) were examined by means of an imaging plate technique and β-ray induced x-ray spectrometry, and they were compared with the distributions after the second (2013–2014) campaign. Strong enrichment of T in beryllium (Be) deposition layers was observed after the second campaign. In contrast, T distributions after the third campaign was more uniform though Be deposition layers were visually recognized. The one of the possible explanations is enhanced desorption of T from Be deposition layers due to higher tile temperatures caused by higher energy input in the third campaign.},

  doi          = {10.1016/j.nme.2019.01.001},

  journal      = {Nuclear Materials and Energy},

  number       = ,

  volume       = 18,

  place        = {United States},

  year         = {Wed Jan 16 00:00:00 EST 2019},

  month        = {Wed Jan 16 00:00:00 EST 2019}

}

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Journal Article:

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https://doi.org/10.1016/j.nme.2019.01.001

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Figures / Tables:

Figure 1: Cross-sectional view of divertor region of the Joint European Torus (JET) and IP images of divertor tiles retrieved after 2013–2014 ITER-like Wall campaign (ILW-2) and 2015–2016 campaign (ILW-3). “ILW-1 & 2” means the tiles were exposed to the plasma during ILW-1 and ILW-2 and retrieved after ILW-2, andmore »

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