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Abstract

The rapid collapse of a tokamak sawtooth oscillation in JET has been observed for the first time in detail on a fast time scale. Tomographic reconstruction of data from two X-ray cameras and ECE temperature profile measurements show that during the sawtooth collapse the central hot region is rapidly displaced off axis and is then redistributed around a surface of constant minor radius. The early phase of the collapse is clearly m=1. The theoretical implications of the measurements are discussed.

Additional information

Authors: EDWARDS A W, JET JOINT UNDERTAKING, ABINGDON (UK);CAMPBELL D J, JET JOINT UNDERTAKING, ABINGDON (UK);ENGELHARDT W W, JET JOINT UNDERTAKING, ABINGDON (UK);FAHRBACH H U, JET JOINT UNDERTAKING, ABINGDON (UK);GILL R D, JET JOINT UNDERTAKING, ABINGDON (UK);GRANETZ R S, JET JOINT UNDERTAKING, ABINGDON (UK);TSUJI S, JET JOINT UNDERTAKING, ABINGDON (UK);TUBBING B J D, JET JOINT UNDERTAKING, ABINGDON (UK);WELLER A JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK), MENTIONIN REPORT JET-P(86)12, 1986
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