Yueqiang Liu et al 2009 Plasma Phys. Control. Fusion 51 115005 doi:10.1088/0741-3335/51/11/115005
Yueqiang Liu1, I T Chapman1, S Saarelma1, M P Gryaznevich1, T C Hender1, D F Howell1 and JET-EFDA contributors
Show affiliationsModelling the low-n, low frequency resonant field amplification (RFA) effects for JET plasmas, using the MHD code MARS-F, offers explanations to one of the recent observations made in experiments, namely a mismatch between the measured RFA threshold and the predicted no-wall beta limit according to ideal MHD calculations. The mismatch is minimized by applying a new way of determining the RFA threshold, based on evaluating the logarithmic derivative of the RFA amplitude as a function of the normalized plasma pressure. This improved method is shown, at least in theory, to be robust in predicting the no-wall beta limit for JET plasmas.
52.55.Fa Tokamaks, spherical tokamaks
Issue 11 (November 2009)
Received 15 April 2009, in final form 4 June 2009
Published 28 October 2009
Yueqiang Liu et al 2009 Plasma Phys. Control. Fusion 51 115005
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