Development of an inductive noise cancellation method for quench detection of the KSTAR CS coils by introducing improved plasma modeling

Abstract

Abstract An inductive noise cancellation method, CDA+MIK, has been developed for better performance of KSTAR (Korea Superconducting Tokamak Advanced Research) CS (Central Solenoid) coils’ quench detection. The CDA+MIK method was evaluated in real operations of the KSTAR superconducting coils. An analysis of this evaluation considering mutual inductances only among CS and PF (Poloidal Filed) coils showed insufficient reduction of the inductive noise in the quench detection signal. On the other hand a supplementary analysis taking into account of eddy currents induced on conductive structures and dynamic plasma evolutions capable to induce voltages showed better reduction even though the inductive noise was under-estimated. This paper describes an improved plasma modelling by considering plasma’s volume and shape, and also application of the model to the experimental results