Abstract
Remote operation and diagnostic systems for particle accelerators have been developed for beam operation and maintenance in various situations. Even though fully remote experiments are not necessary, the remote diagnosis and maintenance of the accelerator is required. Considering remote-operation operator interfaces (OPIs), the use of standard protocols such as the hypertext transfer protocol (HTTP) is advantageous, because system-dependent protocols are unnecessary between the remote client and the on-site server. Here, we have developed a client system based on WebSocket, which is a new protocol provided by the Internet Engineering Task Force for Web-based systems, as a next-generation Web-based OPI using the Experimental Physics and Industrial Control System Channel Access protocol. As a result of this implementation, WebSocket-based client systems have become available for remote operation. Also, as regards practical application, the remote operation of an accelerator via a wide area network (WAN) faces a number of challenges, e.g., the accelerator has both experimental device and radiation generator characteristics. Any error in remote control system operation could result in an immediate breakdown. Therefore, we propose the implementation of an operator intervention system for remote accelerator diagnostics and support that can obviate any differences between the local control room and remote locations. Here, remote-operation Web-based OPIs, which resolve security issues, are developed.
Highlights
In large experimental physics research centers, such as accelerator or telescope facilities, control systems are operated from a control room using applications such as user interfaces (UIs)
The concept underlying global accelerator network (GAN) is the construction of remote accelerator control rooms that are virtually equivalent to the local control room as regards performance and features, and that can be utilized by remote users of the facility
As a next-generation operator interfaces (OPIs) over the Web using the Experimental Physics and Industrial Control System (EPICS) channel access (CA) protocol, we have developed a client system based on WebSocket, which is a new protocol provided by the Internet Engineering Task Force (IETF) for Web-based systems
Summary
In large experimental physics research centers, such as accelerator or telescope facilities, control systems are operated from a control room using applications such as user interfaces (UIs). Control rooms are generally located less than 10 km from control systems; in some accelerator facilities, the control room is located near the accelerator room. For equipment maintenance, to perform collaborative physics measurements on different machines, and for several other reasons, some users require the ability to conduct remote operations from distant locations. By utilizing modern control systems with high-performance networks, control system engineers have realized some of the requisite features of remote operation. In the control system technology field, several studies and. Attempts at implementing such remote operation have been reported
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