Comparison of erosion and deposition in JET divertor during the first three ITER-like wall campaigns

S. Krat (Corresponding Author), M. Mayer, A. Baron-Wiechec, S. Brezinsek, P. Coad, Yu Gasparyan, K. Heinola, I. Jepu, J. Likonen, P. Petersson, C. Ruset, G. De Saint-Aubin, A. Widdowson, JET Contributors

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The manuscript presents an overview of the erosion and deposition data in the inner and outer JET divertor observed during the first three ITER-like wall campaigns (JET-ILW1, JET-ILW2, JET-ILW3). Erosion and deposition were studied using core samples cut out from divertor tiles. For the studied samples a similar general deposition pattern was observed in all three campaigns: More than 60% of the total deposition occurred in the upper region of the inner divertor on tiles 0 and 1, where Be was transported and deposited from the scrape-off layer. High erosion was observed only on tile 5. In JET-ILW2 and 3, erosion together with high power fluxes was observed in the outer divertor at the bottom of tile 7. Additionally, deposition peaks were observed on the sloping parts of tiles 4 and 6, which were more pronounced in JET-ILW2 and 3 due to placing the strike point more often on these tiles. The deposits consisted primarily of Be, with some additional D and C. Deposition rates were observed to decrease from campaign to campaign, with the C deposition rate decreasing the most, more than 2 times from JET-ILW1 to JET-ILW3. D retention up to levels of ∼1 at% was observed up to large depths in the W protective coatings in all campaigns.

Original languageEnglish
Article number014059
JournalPhysica Scripta
Volume2020
Issue numberT171
DOIs
Publication statusPublished - 1 Jan 2020
MoE publication typeA1 Journal article-refereed
Event17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 - Eindhoven, Netherlands
Duration: 20 May 201924 May 2019

Keywords

  • Beryllium
  • Deposition
  • Erosion
  • Hydrogen accumulation
  • Ion beam analysis
  • Jet-ilw
  • Tungsten

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    Krat, S., Mayer, M., Baron-Wiechec, A., Brezinsek, S., Coad, P., Gasparyan, Y., Heinola, K., Jepu, I., Likonen, J., Petersson, P., Ruset, C., De Saint-Aubin, G., Widdowson, A., & JET Contributors (2020). Comparison of erosion and deposition in JET divertor during the first three ITER-like wall campaigns. Physica Scripta, 2020(T171), [014059]. https://doi.org/10.1088/1402-4896/ab5c11