Development of new mass data acquisition system for diagnostics on JT-60U

On JT-60U, two mass data acquisition systems have been acquiring 91 channels of fast-sampling diagnostic data. They are, however, based on rather outdated bus standards and now difficult to update. Therefore we have developed a new mass data acquisition system that has more flexibility and ability to perform a faster data acquisition based on a modern bus standard. The system consists of PXI-based (PCI extensions for instrumentation) digitizers connected to controller PCs, and a server for collecting and processing data from these PCs and transferring them to the main diagnostic computer. Up to now, we have verified that the system acquires 27 channels of data that amounts to 2.2 GB in total, from 3 controller PCs, at a sampling rate of 1 MS/s in a 45 s discharge.