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High performance plasmas were obtained in many JET experiments, both before and after the major shut down of 1992-93. In this paper, a summary is presented of the MHD activity which, in both the old and the new JET configuration, appears to be clearly correlated to the collapse of the neutron yield. The paper discusses aspects of MHD observations in three types of performance limitation: (i) slow roll-overs of the neutron rate, which appear to start with the growth of low n modes in the outer 30 % of the plasma; (ii) sawteeth coupled to ELMs; (iii) giant ELMs.

Additional information

Authors: NAVE M F F, Associaçao Euratom/IST, Instituto Superior Técnico, Lisboa (PT);ALPER B ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(95)03 EN (1995) 10 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199510624 / Last updated on: 1995-06-06
Original language: en
Available languages: en