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WE1BCO05 |
High Accuracy and Cost-Efficient Ethernet-Based Timing System for the IFMIF-DONES Facility | |
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Funding: This work has been carried out within EUROfusion, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200). This article presents the timing system design of the IFMIF-DONES facility, which aims to develop materials that can withstand the harsh conditions of a fusion reactor while maintaining their structural integrity and functional properties. A key goal is to achieve high availability, which requires strong resiliency and redundancy measures throughout the plant design. The timing system design starts with a master clock composed of a stable master oscillator combined with GNSS receiver and clock disciplining equipment. They generate a local time scale and reference frequency with high stability. Three different Ethernet-based protocols are then combined, including NTP, IEEE-1588-2008 & 2019 High Accuracy profile (White-Rabbit) for time transfer purposes. NTP is used for generic computers and industrial devices that lack significant timing constraints, while IEEE-1588-2008 is used for industrial devices that require 1us accuracy or better. Both techniques can be implemented using off-the-shelf equipment and operate well over networks with moderate bandwidth utilization. The White-Rabbit protocol is used for devices that require highly accurate timing and can achieve sub-ns accuracy. It is typically designed for small, dedicated networks for timing only. This contribution describes the design of this timing system, highlighting how the best trade-off between cost and performance can be achieved through Ethernet technologies and how resiliency methods are implemented. Department of Computer engineering, automation and robotics, University of Granada, Spain. |
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