skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

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:
 [1];  [1];  [2];  [2]; ORCiD logo [1];  [3];  [4];  [4];  [4]; ORCiD logo [5];  [6]
  1. Univ. of Toyama, Gofuku (Japan)
  2. VTT Technical Research Centre of Finland, Espoo (Finland)
  3. National Inst. for Fusion Science (NIFS), Toki (Japan)
  4. National Inst. for Quantum and Radiological Science and Technology, Rokkasho (Japan)
  5. Univ. of Helsinki (Finland)
  6. Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
Publication Date:
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.
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. doi:10.1016/j.nme.2019.01.001.
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. doi:10.1016/j.nme.2019.01.001. https://www.osti.gov/servlets/purl/1502353.
@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 = {2019},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 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 » “ILW-2 only” indicate the tiles were installed in the vacuum chamber after ILW-1 and then retrieved after ILW-2.The colors indicate the intensity of photo-stimulated luminescence (PSL) from IPs in ascending order from blue (lowest), green, yellow and red (highest). Blue contrast in a round shape correspond to the area from which disk specimens were taken out by coring. Photos of Tiles 4 and 6 retrieved after ILW-3 are also shown. White letters indicate tile numbers, and red letters indicate S-coordinate corresponding to the distance along the tile surface in mm. Black arrows indicate band-like regions with tritium enrichment. Specimens corresponding to β-ray induced x-ray spectra shown in Fig. 3(a) and (b) were taken from Tiles 6 and 8 at poloidal positions indicated by red arrows.« less

Save / Share:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.