The research on probe fault detection of EAST magnetic diagnostic system

Abstract The magnetic diagnostic system provides input signals for the equilibrium reconstruction, plays a key role in the plasma feedback control. Real-time monitoring and abnormal signal detection of the magnetic diagnostic system are significance for the operation of tokamak. In this paper, a general fault detection algorithm is proposed, based on the spatial auto-correlation of the probes. This algorithm firstly obtains the linear mapping between the expected value of each probe and the measured values of its adjacent probe combination through regression fitting, and then sets the fault detection threshold initially based on the fitting result of the absolute error distribution. Besides, fault probe location is realized through a voting mechanism. The algorithm can simultaneously realize the fault detection of multiple non-adjacent probes. Based on the experimental data from EAST, the method described here shows a good performance and a potential in the long-pulsed operation.