Optimization of the Magnetic Sensor Configuration for JT-60SA Plasma Control

The number of magnetic probes and flux loops required for a sufficiently accurate plasma surface reconstruction of JT-60SA are investigated by applying the Cauchy condition surface (CCS) method. For this purpose, CCS reconstruction parameters, CCS size and the number of CCS nodes, were optimized using the various combinations of limited number of magnetic sensors. The highly accurate reconstruction within the 1 cm divertor-hit-point error in the JT-60SA plasma can be obtained by optimizing the CCS reconstruction parameters. Once the minimum sensor configuration is found, we can optimize the number of sensors and the related data acquisition systems.