EFDA-JET Preprints and Conference Papers service: EFD-C(10)08/29

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EFD-C(10)08/29

Confinement and Edge Studies Towards Low r* and n* at JET

I. Nunes, P.J. Lomas, D.C. McDonald, G. Saibene, R. Sartori, I. Voitsekhovitch, M. Beurskens, G. Arnoux, A. Boboc, T. Eich, C. Giroud, S Heureux, E de la Luna, G. Maddison, A.C.C. Sips, H. Thomsen, T.W. Versloot and JET EFDA contributors

Abstract. The size and capability of JET to reach high plasma current and field enables a study of the plasma behaviour at ion Larmor radius and collisionality values approaching those of ITER. In this paper such study is presented. The achievement of stationary type I ELMy H-modes at high current proved to be quite challenging. As the plasma current was increased, it became more difficult to achieve stationary conditions. Nevertheless, it was possible to achieve stable operation at high plasma current (up to 4.5MA) and low q₉₅ (2.65-3) at JET. One of the main reasons to revisit the high plasma current experiments done in 1997 is the higher power available and he improvement of the pedestal diagnostics. Indeed, compared with previous results, higher stored energy was achieved but confinement was still degraded. The causes of this confinement degradation are discussed in the paper.

Preprint of Paper to be submitted for publication in Proceedings of the 23rd IAEA Fusion Energy Conference, Daejon, Republic of Korea. (10th October 2010 - 16th October 2010)

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