EFDA-JET-CP(08)03/13

High bN Experiments at JET in ITER-Like Plasmas in Support of the ITER Steady State Scenario

V. Pericoli Ridolfini, Yu. Baranov, M. Beurskens, M. Brix, P. Buratti, G. Calabrò, C. Castaldo, R. Cesario, C.D. Challis, R. De Angelis, P.C. de Vries, J. Ferron, E. Giovannozzi, C. Giroud, M. Gryaznevich, T.C. Hender, D. Howell, E. Joffrin, T. Luce, P. Lomas, J. Mailloux, D.C. McDonald, J. Menard, M Murakami, F. Orsitto, F. Rimini, G. Saibene, S. Sharapov, P. Smeulders, I. Voitsekovitch, O. Zimmermann, JET EFDA contributors
Low tokamak plasma current, Ip, favours steady-state operation, due to the smaller Non-Inductive (NI) current to be externally driven, and to the higher self-generated bootstrap current fraction Ibs/Ip, for a given plasma pressure. However, this penalizes the energy confinement time tE (µIp), as compared to the basic H-mode value t98(y,2)[1]. Advanced tokamak scenarios aim at compensating for this tE drop, in order to preserve a high fusion gain (Q~5).
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