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Description
A high-resolution, real-time bunch-by-bunch phase detection system has been developed and deployed at the Taiwan Photon Source (TPS) to monitor and analyze synchronous phase behavior. The system is integrated with the control system to implement the remote phase adjustment function. The detector architecture utilizes an analog I/Q demodulation scheme operating at the 1.5 GHz third harmonic of the RF frequency to achieve precise phase extraction. Limited by hardware non-idealities, DC offsets and quadrature phase imbalances distort the I/Q signal trajectory into an elliptical profile, leading to periodic measurement errors. To address these issues, a digital calibration strategy based on ellipse-fitting is implemented to eliminate offsets and quadrature errors within the I/Q channels.
After calibration, the phase error of this system at 1.5 GHz is within 1.5°, therefore, when used to measure a 500 MHz signal, the corresponding phase error is within ±0.5°. The extracted phase data is integrated into the accelerator control system with a 3 Hz update rate, enabling real-time visualization of transient beam loading effects. Furthermore, the system’s capability to record 700 turns of bunch motion for phase variation analysis.
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