Distributed Diagnostic System Based on TSN for RF Ion Source Test Facility at ASIPP

A radio frequency (RF) driven ion source is a very important component of a neutral beam injector for large magnetic confinement fusion devices. In order to study the key technology and physics of an RF driven ion source for a neutral beam injector in China, an RF ion source test facility was developed at the Institute of Plasma Physics, Chinese Academy of Sciences. In order to monitor the operating status and provide safety protection of the neutral beam, a large number of thermocouples are installed on each heat load component of the device to monitor the real-time temperature changes of the components and cooling water. Because the components of the device are at different potentials, the potential isolation should be considered in the design of diagnostic system. In order to solve the problem of potential isolation of collected signals and ensure the interlock protection system works within microseconds, this paper proposes a distributed data acquisition system based on TSN (time-sensitive network) protocol. The system uses a distributed structure to achieve separate collection of signals of different potentials, each collection device is connected by optical fiber, the signal of the system is collected synchronously, which provides a response time for fast interlocking protection, lay the foundation for the next development of CRAFT (Comprehensive Research Facility for Fusion Technology) NNBI (negative neutral beam injector) diagnosis system.