PTP Grandmaster Clock Synchronization for Particle Detector Timing
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Solution Overview
Problem
Particle detector facilities face challenges in achieving precise time recording due to the high cost and complexity of dedicated clock networks, potential miscalibration in relative timestamp models, and limited precision, which can be compromised by proprietary hardware and software protocols, as well as the variance in data network properties.
Innovation Solution
Implementing a data network for both data exchange and clock synchronization using a grandmaster clock synchronized with a high-precision source, such as an atomic clock, and utilizing standardized protocols like Precision Time Protocol (PTP) to provide absolute event timestamps with sub-microsecond precision, reducing the need for additional hardware and proprietary components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated clock network with proprietary hardware and software protocols is used for time synchronization, then time recording precision is improved, but hardware cost and system complexity increase
Solution Approach 1:
The patent combines data communication and clock synchronization functions into a single standardized data network infrastructure. Instead of maintaining separate dedicated clock networks with proprietary hardware, the system uses existing data networks (Ethernet, InfiniBand, Fiber Channel) to carry both data traffic and time synchronization traffic, thereby reducing hardware complexity while maintaining precision through protocols like PTP (Precision Time Protocol)
Solution Approach 2:
The patent makes the data network multi-functional by enabling it to serve both data exchange and time synchronization purposes. The same network infrastructure that carries experimental data also distributes synchronized time signals to all detector components, eliminating the need for specialized dedicated clock network hardware and reducing overall system complexity
2Measurement precision
If a dedicated clock network with proprietary hardware is used, then time synchronization precision is improved, but hardware cost increases
Solution Approach 1:
The patent replaces expensive, specialized proprietary clock network hardware with standardized, commercially available data network components. By using off-the-shelf Ethernet switches, network cables, and standard network interface cards that support PTP, the system achieves comparable time synchronization precision at significantly lower hardware cost
Solution Approach 2:
The patent substitutes physical dedicated clock distribution infrastructure with a software-based time synchronization protocol running over existing data networks. Instead of relying on specialized hardware circuits for time distribution, the system uses standardized network protocols (PTP, NTP) that can be implemented in software, reducing hardware dependency and cost
3Device complexity
If relative timestamp model is used, then hardware requirements are reduced, but time recording accuracy is compromised due to potential miscalibration
Solution Approach 1:
The patent implements a feedback-based time synchronization mechanism where devices continuously receive time reference signals from a grandmaster clock and adjust their local clocks accordingly. The PTP protocol provides feedback loops that measure and compensate for network transmission delays, ensuring that timestamp accuracy is maintained even though devices use standard network hardware rather than dedicated clock infrastructure
Data Source
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AI summary
Presented herein are systems, methods, and computer-readable media for recording event times in particle detection scenarios. The systems, methods, and computer-readable media involve the identification of one facility device as a grandmaster clock among at least two facility devices of a facility device set, where the respective facility devices are selected from a facility device type set including a beam monitor; a neutron instrument; a neutron chopper; a nuclear reactor; a particle accelerator; a network router; and a user workstation. The system, method, and computer-readable medium also involve configuring the facility devices to synchronize a clock component with the grandmaster clock; and, upon detecting an event, retrieve from the clock component of the selected facility device an absolute event timestamp that is independent of event times of other events, and store a record of the facility event and the absolute event timestamp in the data store.