基于精确时间协议的托卡马克定时系统时钟偏差的补偿研究

Tokamak timing system provides accurate synchronization mechanism for each plant system, which is of great important to guarantee the orderly discharging campaign and the accuracy of the acquired data. It’s one of the prerequisites for the research of magnetic confined plasma. The precision time protocol (PTP) is a protocol used to synchronize clocks throughout a computer network. The application of this protocol in national fusion is still in its infancy while it is popular in electric power, telecommunication and other fields. This project aims to study the precision time protocol and puts forward an error compensation algorithm to solve the problem of master-slave clock deviation. Furthermore, a stable and reliable timing system combined with FPGA will be developed to provide a new synchronization approach for the fusion devices. We also hope that we have the ability to customize synchronization equipments after this project.

托卡马克定时系统为分控系统提供准确的同步机制，对于实验的有序进行与数据的准确获取具有重要的意义，它是顺利开展磁约束等离子体研究的前提之一。精确时间协议（PTP）是一种通过网络实现时钟同步的协议，该协议在电力、通信等行业均有应用，但在国内聚变领域还处于起步阶段。本项目旨在研究PTP协议，提出合理的误差补偿方案以解决主从时钟偏差的问题，并在此基础上结合FPGA设备开发稳定可靠的定时系统，为聚变装置提供新的同步途径。我们亦希望通过本项目的研究，为将来定制同步设备做好知识储备。

托卡马克定时系统为分控系统提供准确的同步机制，对于实验的有序进行与数据的准确获取具有重要的意义，它是顺利开展磁约束等离子体研究的前提之一。精确时间协议（PTP）是一种通过网络实现时钟同步的协议，该协议在电力、通信等行业均有应用，但在国内聚变领域还处于起步阶段。本项目通过研究PTP协议主从时钟偏差的问题，提出了一种从时钟频率误差补偿方案并将其应用于EAST定时系统，该系统基于PXI总线实现，扩展性好且运行稳定。在资助项目的延伸工作中借助嵌入式平台 ARM STM32和LwIP开发从时钟节点设备，这是自主研制同步设备的第一步，为将来定制精度更高的同步设备做好知识储备。