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This paper explores the improvement of confinement regimes in tokamaks. Heating during the early part of the current rise phase gives a low or negative magnetic shear in the centre of the 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 r/a=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 (MHD) instabilities.

Additional information

Authors: SIPS A C C ET AL, JET Joint Undertaking, Abingdon, Oxon (GB);GREENFIELD C M ET AL, General Atomics, San Diego (US);LAZARUS E A ET AL, Oak Ridge National Laboratory (US);RICE B W, Lawrence Livermore National Laboratory (US)
Bibliographic Reference: Report: JET-P(97)29 EN (1997) 12pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199711637 / Last updated on: 1997-12-09
Original language: en
Available languages: en