JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - UNPB AU - Díaz, J. AU - Casero, I.C. AU - Megías, C. ED - Schaa, Volker RW ED - Götz, Andy ED - Venter, Johan ED - White, Karen ED - Robichon, Marie ED - Rowland, Vivienne TI - High Accuracy and Cost-Efficient Ethernet-Based Timing System for the IFMIF-DONES Facility J2 - Proc. of ICALEPCS2023, Cape Town, South Africa, 09-13 October 2023 CY - Cape Town, South Africa T2 - International Conference on Accelerator and Large Experimental Physics Control Systems T3 - 19 LA - english AB - 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. PB - JACoW Publishing CP - Geneva, Switzerland ER -