Design Considerations of a CAMAC System for Large Tokamak JT-60

Microprocessor based distributed intelligence CAMAC system is adopted in control and monitoring of a large Tokamak device JT-60. Such novel techniques as hierarchical serial highways, auxiliary controllers with standard highway ports, a variable word-length data transfer, byte serial data transfer with single cable of optical fiber pair, hand-shaking timing system with error recovery capability, flying capacitor multiplexers for temperature monitor and digital integrators for electro-magnetic probe are introduced in the CAMAC system. Outlines of the new techniques as well as system configuration of JT-60 CAMAC system are described.