Test Results About Simple CDA + MIK Quench Detection Method on EAST for ITER Superconducting CS Coils

Abstract

The test about simple central difference average (CDA) + MIK ( $\text{M}_{ik}$ mutual inductance between ith and kth component) quench detection method implemented a total of about 100 charging runs on EAST in the past two years, aiming at verifying this new method whether to apply it to ITER CS coils or not. This project is supported by the ITER Organization. To obtain this target, the whole instrumentation hardware have been developed and installed on EAST and used to generate experimental data. Considering the whole new CS coils connection configuration and the possible risk for EAST device, the typical achievement is to accomplish successfully plasma scenarios (the longest shot of plasma current around 250 kA and pulse 3 s) by using a simple CDA + MIK quench detection method on EAST for the first time. Moreover, the numerical quench detection model has been designed, and the numerical signals are in good agreement with experimental data. Recent experimental results showed that CDA + MIK technology is applicable to the ITER CS coils as a backup method but the sensitivity of this system should be improved greatly in order to meet experiment requirements for ITER operation in the future. This paper introduces the test program, typical achieved operation, and the results of preliminary analysis.