Resonant Field Amplification in JET Advanced Regimes
ORAL
Abstract
Resonant Field Amplification (RFA) has been systematically measured on JET, in two domains favourable for ITER steady-state operations: broad q-profiles with qmin ~ 1 and qmin ~ 2. MARS-F code modelling reproduces RFA data at low and high beta and suggests a new method of how the RFA data should be used to determine the no-wall limit experimentally. Although there is no strong evidence of a beta-limit connected with the RWM even at betaN~4 and performance was limited by internal n=1 modes, the observed (using RFA data) decrease in the no-wall limit with the increase in qmin is in agreement with the same dependence of the experimentally achieved highest beta values.
*Funded by the United Kingdom Engineering and Physical Sciences Research Council and by the European Communities under the contract of Association between EURATOM and UKAEA.
–