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In a large experimental physics project such as ITER and LHC, the project has managed by an international collaboration. Similarly, ILC (International Linear Collider) as next generation project will be started by a collaboration of many institutes from three regions. After the collaborative construction, any collaborators except a host country will need to have some methods for remote maintenances by control and monitoring of devices. For example, the method can be provided by connecting to the control system network via WAN from their own countries. On the other hand, the remote operation of an accelerator via WAN has some issues from a practical application standpoint. One of the issues is that the accelerator has both experimental device and radiation generator characteristics. Additionally, after miss operation in the remote control, it will cause breakdown immediately. For this reason, we plan to implement the operator intervening system for remote accelerator diagnostics and support, and then it will solve the issues of difference of between the local control room and other locations. In this paper, we report the system concept, the development status, and the future plan.
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