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Abstract

Measurements of the toroidal magnetic field inside the JET tokamak plasma by means of the motional Stark effect are reported. In the vicinity of the resonance layer, ion cyclotron resonance heating (ICRH) generates a population of energetic ions. For the first time the diamagnetic change in the toroidal magnetic field due to these ICRH fast ions has been measured. A magnetic field decrease up to 4 % has been observed. Oscillations of the toroidal magnetic field caused by sawtooth oscillations of the thermal plasma pressure have been resolved. First results of the local beta-increase due to ICRH, the diamagnetic current density and the slowing-down time of the fast particles are presented.

Additional information

Authors: WOLF R C, JET Joint Undertaking, Abingdon, Oxon. (GB);ERIKSSON L-G, JET Joint Undertaking, Abingdon, Oxon. (GB);VON HELLERMANN M, JET Joint Undertaking, Abingdon, Oxon. (GB);KÖNIG R, JET Joint Undertaking, Abingdon, Oxon. (GB);PORCELLI F, JET Joint Undertaking, Abingdon, Oxon. (GB);MANDL W, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: JET-P(93)24 EN (1993) 38 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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