Remodeling of diagnostic systems to network-oriented systems on JT-60U

Sato, Minoru; Nagasaka, Yasushi*; Kiyono, Kimihiro; Sakata, Shinya; Kominato, Toshiharu

Since the start of operation, many of the JT-60U's diagnostic systems have been utilizing the CAMAC as measurement bus for control and data acquisition of plasma diagnostics. To improve the maintainability and functionality, a major remodeling of those systems was done in 2003. Mini-computers and microcomputers, which used to control CAMAC and acquire data, were replaced with UNIX-based workstations, and software for more flexible control and data acquisition was developed from the original software. Since the remodeling, each diagnostic system has been gradually replaced with VME, PCI and PXI instead of CAMAC, to meet the demands of individual diagnostic devices; to handle increasing volume of data resulting from long pulse discharges of advanced experiments. For remaining CAMAC systems, computers were upgraded to Linux-based systems, and the device driver for CAMAC based on PCI was newly developed. Moreover, legacy software has been redesigned and new software based on a network communication framework, such as server-client communication, is being developed for realizing a decentralized control system by using VME and PCI Linux platforms. In this paper, detailed remodeling of JT-60U's diagnostic systems to network-oriented systems that are suitable for remote collaboration is described.