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Bursts of sawtooth-like activity with remarkably constant period are often detected on the electron temperature profile T(e) during the early phase of FTU discharges. They are distinct from the sawtooth activity that is usually observed in steady state discharges and are usually seen when the plasma internal inductance is still rising after the current has reached its plateau value. Up to 15 sawteeth can be found in each burst; their period ranges from 3 to 12 msec. A single discharge may exhibit several of these phenomena separated by quiescent phases. After this transient phase the discharge usually evolves into a q = 1 sawtoothing plasma, although sawtooth-free discharges with episodic crashes may be observed. This phenomenon is investigated and the suggestion that the Kadomtsev reconnection mechanism is the cause of observed T(e) crashes is discussed.

Additional information

Authors: ALLADIO F, ENEA, Centro Ricerche Energia Frascati, Roma (IT);BURATTI P, ENEA, Centro Ricerche Energia Frascati, Roma (IT);MICOZZI P, ENEA, Centro Ricerche Energia Frascati, Roma (IT);TUDISCO O, ENEA, Centro Ricerche Energia Frascati, Roma (IT)
Bibliographic Reference: Paper presented: 20th EPS Conference on Controlled Fusion and Plasma Physics, Lisboa (PT), July 26-30, 1993
Availability: Available from (1) as Paper EN 37541 ORA
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