Radio frequency cavity ignition position diagnosis method based on differential flight time

By installing arc detectors at both ends of the RF cavity and performing differential time-of-flight measurements, combined with dynamic amplitude normalization and shared slope fitting algorithms, high-precision, real-time, and interference-resistant positioning of the RF cavity ignition position is achieved, solving the problem of insufficient positioning accuracy in existing technologies and reducing hardware costs.

CN120669076AActive Publication Date: 2025-09-19CHINA SPALLATION NEUTRON SOURCE SCI CENT +2
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Patent Information

Application Number
CN202510836346.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-21
Publication Date
2025-09-19
Estimated Expiration
2045-06-21

AI Technical Summary

Technical Problem

Existing radio frequency cavity spark positioning technology has problems such as insufficient positioning accuracy, weak anti-electromagnetic interference capability, and inability to respond in real time. In particular, it is difficult to quickly locate centimeter-level defects or contamination points in complex cavity structures.

Method used

A dual-channel differential time-of-flight measurement architecture is adopted. By installing fast-response arc detectors at both ends of the RF cavity, the optical signal of the ignition event is captured in real time. Dynamic amplitude normalization processing and least squares fitting of the shared slope are performed to calculate the nanosecond time difference. Combined with the propagation speed of electromagnetic waves, sub-centimeter positioning is achieved.

Benefits of technology

It achieves high-precision, anti-interference, and real-time response ignition position diagnosis, breaking through the spatial resolution limit of traditional methods, reducing hardware costs and improving the convenience and economy of field applications.

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Abstract

The invention relates to the technical field of particle accelerators, and provides a radio frequency cavity ignition position diagnosis method based on differential flight time. According to the method, a dual-channel differential flight time measurement framework is adopted, and fast-response arc light detectors are symmetrically installed at the two ends of a radio frequency cavity, so that light signals of a sparking event are captured in real time, and dual-channel original waveform data are recorded; performing dynamic amplitude normalization processing on the signal to eliminate the gain difference of the sensor; step response parameters are analyzed to calculate time difference, a slope-shared least square fitting model is adopted to reversely deduce a theoretical time point, the time difference is converted into a spatial distance difference in combination with the electromagnetic wave propagation speed, and finally the ignition point position is determined. The centimeter-level positioning is realized, the anti-interference capability and the positioning stability are greatly improved, the real-time online monitoring and quick response capability is realized, the hardware cost is reduced by more than 90%, seamless integration with the existing system can be realized, and the convenience and the economical efficiency of field application are improved.
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