ANALYSIS OF SAWTOOTH INSTABILITIES IN JET
Sawtooth instabilities which are observed in virtually all JET "flat top' discharges, have been investigated with a wide range of diagnostics: electron cyclotron emission, neutron emission, soft x-ray diodes, density interferometry and reflectometry, H-alpha and impurity emission, magnetic pick-up coils, and limiter viewing camera. Aspects of sawtooth activity studied include the onset of sawteeth at early discharge times, MHD oscillations associated with sawteeth, sawtooth fall times, "giant" (double) sawteeth, and the variation of sawtooth behaviour when additional heating (ICRH) is applied. It is found that sawtooth behaviour in JET is not satisfactorily described by conventional models of the sawtooth instability.
Bibliographic Reference: 12TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA PHYSICS, BUDAPEST (HUNGARY), SEPT. 2-6, 1985 PP. 49-52 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK), MENTIONING REPORT JET-P(85)10, 1985
Record Number: 1989124057600 / Last updated on: 1987-01-01
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