Contrasting H-mode behaviour with deuterium fuelling and nitrogen seeding in the all-carbon and metallic versions of JET
physics.plasm-ph
/ Authors
G. P. Maddison, C. Giroud, B. Alper, G. Arnoux, I. Balboa, M. N. A. Beurskens, A. Boboc, S. Brezinsek, M. Brix, M. Clever
and 41 more authors
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, M. Groth, S. Jachmich, A. Järvinen, E. Joffrin, M. A. H. Kempenaars, U. Kruezi, K. D. Lawson, M. Lehnen, M. J. Leyland, Y. Liu, P. J. Lomas, C. G. Lowry, S. Marsen
/ 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.