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AbstractAbstract
[en] In preparation for the Frascati Tokamak Upgrade (FTU) 2007 experimental programme, the priorities were changed to some extent to allow more machine time to be allocated to new ideas and to take into account the reduced power availability. In fact a filament failure of two of the six lower hybrid (LH) gyrotrons and an unfortunate accident to one out of the four electron cyclotron gyrotrons during its transportation to the Frascati laboratories made it impossible to reach the high performance foreseen for the advanced-scenario programme. Emphasis was placed on the study of the high-density and peaked-profile regimes obtained in operations with the liquid lithium limiter (LLL) and control of magnetohydrodynamic (MHD) modes and disruptions. High priority was also given to the study of electron fishbone instability, which is theoretically expected in the presence of fast electrons generated by LH and electron cyclotron resonance heating (ECRH). Some relevance was also allocated to the study of dust dynamics in the scrape-off layer (SOL). Unfortunately, a series of contingencies affecting the spring campaign hampered the continuity of operations and hence strongly reduced the time devoted to scientific activities. Although the reliability of most of the machine subsystems allowed about seven weeks of operations, with 90% efficiency, only two weeks were effectively devoted to the scientific programme. After some problems connected with CO2 contamination of the main vacuum, the autumn campaign was not successful and then definitively cancelled because of a fault on the poloidal system power supply
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Nuclear fusion and fission, and related technologies department, ENEA, Frascati, Rome (Italy); 204 p; Dec 2007; p. 8-33; Also available from http://www.fusione.enea.it
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