Operation at high performance in optimized shear plasmas in JET

A.C.C. Sips, Y. Baranov, C.D. Challis, G.A. Cottrell, L.-G. Eriksson, C. Gormezano, C. Gowers, C.M. Greenfield, J.C.M. de Haas, M. von Hellerman, G.T.A. Huysmans, A. Howman, R. König, E.A. Lazarus, T.C. Luce, P.V. Nielsen, D.P. O'Brien, B.W. Rice, G.J. Sadler, F.X. SöldnerM.F. Stamp, E.J. Strait, B.J.D. Tubbing, M. Wade, D.J. Ward

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Heating during the early part of the current rise phase gives a low or negative magnetic shear (= 0741-3335/40/6/020/img27(dq/dr)) in the centre of JET plasmas. Under these conditions the confinement improves with high additional heating power heating during the current ramp-up phase of the discharge. The reduction in the transport manifests itself as a peaking of the profiles with a large gradient region near 0741-3335/40/6/020/img28 = 0.55. The best discharges have no transport barrier at the edge of the plasma (L-mode). This allows central power deposition by the neutral beams in JET. A control of the plasma pressure, using feedback of the additional heating power in real-time, minimizes the impact of magnetohydrodynamic instabilities. As a result, these discharges achieve the highest D-D neutron rates in JET; 0741-3335/40/6/020/img29, with 0741-3335/40/6/020/img30, 0741-3335/40/6/020/img31 and 0741-3335/40/6/020/img32.
Original languageEnglish
Pages (from-to)1171-1184
JournalPlasma Physics and Controlled Fusion
Issue number6
Publication statusPublished - 1 Jun 1998
Externally publishedYes


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