Contrasting H-mode behaviour with deuterium fuelling and nitrogen seeding in the all-carbon and metallic versions of JET
G. P. Maddison, C. Giroud, B. Alper, G. Arnoux, I. Balboa, M. N. A., Beurskens, A. Boboc, S. Brezinsek, M. Brix, M. Clever, R. Coelho, J. W., Coenen, I. Coffey, P. C. da Silva Aresta Belo, S. Devaux, P. Devynck, T., Eich, R. C. Felton, J. Flanagan, L. Frassinetti, L. Garzotti
TL;DR
This study compares H-mode plasma behavior with deuterium fueling and nitrogen seeding in JET's all-carbon and metallic wall configurations, highlighting differences relevant for ITER's material choices.
Contribution
It provides the first direct comparison of H-mode characteristics between all-carbon and metallic wall configurations in JET under similar fueling and seeding conditions.
Findings
Differences in H-mode thresholds between wall types.
Impact of impurity seeding on plasma performance.
Implications for ITER wall material choices.
Abstract
The former all-carbon wall on JET has been replaced with beryllium in the main torus and tungsten in the divertor to mimic the surface materials envisaged for ITER. Comparisons are presented between Type I H-mode characteristics in each design by examining respective scans over deuterium fuelling and impurity seeding, required to ameliorate exhaust loads both in JET at full capability and in ITER.
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