Izuru Yonekawa

Data acquisition and management requirement for ITER

The almost continuous nature of ITER operation necessitates both data acquisition and processing to be in real-time. The distributed control system architecture associated with intelligent front-end data processing and high band-wise communication network technologies must be provided to allow for its experimental aspects. These requirement and data processing concepts are described.

The JT-60 central control system

This paper describes the central control system of the JT-60 tokamak. This control system not only has to organize plasma operation, but also has to utilize devices under isolated operation. Therefore the control system has been designed in a special way.

Remodeling of JT-60 discharge control system

Remodeling of the JT-60 discharge control system (DCS) is initiated to minimize the cost and time for hardware maintenance and software development. Three principles have been adopted for remodeling. (1) The functions of the DCS must remain intact. (2) The shutdown period must be minimized to maximize JT-60 experiment time. To realize the new DCS, (3) a combination of the host workstation (WS) and target Versa Module Europe (VME)-bus system with real time OS was chosen as the fundamental structure. The prototype DCS was designed and tested to evaluate the performance of the converted discharge sequential control software modules and the message communication program. The new configuration of the DCS and procedure of smooth remodeling without shutdown is described in detail.

Development of a new discharge control system for JT-60 with a unix workstation and a VME-bus system

Abstract The old discharge control system (DCS) with HIDIC-80E mini-computer has been replaced by a control system with a unix workstation and a VME-bus system. Functionally, the workstation performs message communication with VME controller on the network, data processing using plant data and data acquisition. The commands and receiving the status data in real time. The new DCS is flexible for system extension and able to quickly respond to various requirements of software modifications. The data acquisition speed has been improved by almost a factor of two over the old one. Troubles and countermeasures experienced in the replacement work are also presented.

SAFETY DESIGN OF THE JT-60 CONTROL SYSTEM

The control system of JT-60 consists of several computer-CAMAC combinations, timing systems and hard-wired interlock systems. The functions of the control system are roughly represented by discharge control including real-time feedback control, plant operation support and safety interlock.

DESIGNING & DEVELOPMENT OF THE REAL-TIME CONTROL SYSTEM FOR JT-60 PLASMA DISCHARGE

Real-time plasma control is planned to be executed in JT-60 experiments. The object of which is to obtain the Q=l plasma, protecting the JT-60 machine from the electromagnetic force, heat load, etc. In this report we present the design of this control system.