Sawteeth and m=1 mode evolution during ECRH/ECCD on FTU tokamak

Details Sawteeth and m=1 mode evolution during ECRH/ECCD on FTU tokamak Sawteeth and m=1 mode evolution during ECRH/ECCD on FTU tokamak

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..485..265r&link_type=abstract

The thirteenth topical conference on radio frequency power in plasmas. AIP Conference Proceedings, Volume 485, pp. 265-268 (199

Computer Science

4

Plasma Heating By Particle Beams, Theory, Design, And Computerized Simulation, Macroinstabilities

Scientific paper

Localized ECRH/ECCD has been performed on FTU with the specific aim of shaping the temperature/current density profile for controlling MHD activity. In particular, m=1 mode dynamics and stability are studied during the heating phase, when the steady-state, sawtoothing conditions of the ohmic plasma are modified by a strong off-axis electron heating. Depending on the position of the absorbing layer and on the density of the ohmic target plasma, sawteeth are temporarily suppressed, still in the presence of a slowly growing m=1 oscillation, or a complete quenching of any m=1 activity can be achieved. When direct current, driven by EC waves launched at +/-10° from the perpendicular in the up-shifted scheme, is added to the pure heating effect, different shapes and periods of relaxation phenomena in the plasma core are observed. Although low values of IECCD/Ip are expected because of rather high values of Zeff during heating, (IECCD/Ip=0.04 for pBC=800 KW, Zeff=5 and Ip=360 kA), different local changes in the magnetic shear are thought to be responsible of these differences. Time-dependent calculations of current profiles, including transport and diffusion effects, and an analysis of the onset and stabilization of sawtooth oscillations based on the time evolution of s1 (the magnetic shear value at q=1) compared with that of a suitable critical value are performed.

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