Resonant Field Amplification Testing of Edge Localised Mode Stability on JET
Resonant Field Amplification (RFA) has been found as a good indicator of the ideal no-wall stability limit and overall stability of the plasma. It has been observed that a peak in RFA sometimes occurs at bN below the RFA threshold associated with the ideal no-wall limit. A correlation has been found between shots with extra puffing at the 1st ELM and the suppression of the early RFA peak. This is suggested to be due to the additional puffing effecting the stability of an n = 1 peeling mode. The result and present ongoing experiments are outlined.