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The plasma response from an external n = 2 magnetic perturbation field inASDEX Upgrade has been measured using mainly electron cyclotron emission (ECE)diagnostics and a rigid rotating field. To interpret ECE and ECE-imaging(ECE-I) measurements accurately, forward modeling of the radiation transporthas been combined with ray tracing. The measured data is compared to syntheticECE data generated from a 3D ideal magnetohydrodynamics (MHD) equilibriumcalculated by VMEC. The measured amplitudes of the helical displacement aroundthe low field side midplane are in reasonable agreement with the one from thesynthetic VMEC diagnostics. Both exceed the prediction from the vacuum fieldcalculations and indicate the presence of a kink response at the edge, whichamplifies the perturbation. VMEC and MARS-F have been used to calculate theproperties of this kink mode. The poloidal mode structure of the magneticperturbation of this kink mode at the edge peaks at poloidal mode numberslarger than the resonant components |m| > |nq|, whereas the poloidal modestructure of its displacement is almost resonant |m| ~ |nq|. This is expectedfrom ideal MHD in the proximity of rational surfaces. The displacement measuredby ECE-I confirms this resonant response.

Plasma response measurements of external magnetic perturbations using electron cyclotron emission and comparisons to 3D ideal MHD equilibrium