Abstract
Newly developed methods of visualization and determination of widths of internal magnetic islands are based on measurements of the perturbed magnetic fields near the plasma border. Reliable analysis of pick-up (Mirnov) coils data is rather complicated and measurement errors have to be minimized. Plasma wall interaction, electrical sparks in the discharge chamber, and resonances in the measurement systems could be main sources of errors but, also, the design of coils should take into account that the typical frequency band of the disruptive processes is in the range of ∼100 kHz–1.5 MHz. A double Faraday coaxial screening with a symmetrically input system of pick-up coils was developed for disruption studies in the TCABR tokamak in São Paulo. The main design features of this high precision pick-up coil system are discussed.
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