Speaker
Description
This study addresses X-ray beam stabilization challenges in fourth-generation synchrotron radiation systems by developing an active feedback control system. Replacing passive vibration isolation, the solution integrates high-sensitivity current detection (pA-nA range) for beam positioning with piezoelectric actuators achieving nanometer-scale adjustments. The driver operates at hundreds of mA with mV precision, enabling over 100 Hz regulation frequency. This dual approach ensures precise beam monitoring and control, meeting the stringent stability requirements for advanced synchrotron experiments.
Summary (500 words)
This project develops a high-frequency, high-precision data acquisition system for weak current signals (pA-level) from quadrant position-sensitive detectors in fourth-generation synchrotron radiation X-ray beam stabilization systems. By leveraging high-resistance I-V conversion principles and Analog Devices ultra-low input bias current operational amplifiers, a custom-designed front-end circuit achieves four-channel synchronous current acquisition with 9.7936 mV/pA sensitivity and 1.3% error for currents above 10 pA, fulfilling the stringent weak current measurement requirements of advanced light sources. Acquired signals are processed by the beam stabilization core control board for real-time position calculation and feedback control. The back-end actuation system integrates piezoelectric ceramics driven by a high-voltage linear power supply and DC amplification circuitry, utilizing APEX PA-series operational amplifiers to deliver 0-120V driving voltage with >100 mA output current while maintaining millivolt noise levels. This configuration enables nanometer-scale beam position adjustments through a self-developed mechanical platform. Key innovations include a hybrid analog-digital architecture for sensitivity-speed optimization, power supply isolation for noise suppression, linear amplification techniques for signal integrity, and thermally stable high-voltage drive implementation. Experimental validation confirms the system’s capability to meet fourth-generation synchrotron radiation specifications, establishing a robust verification platform for X-ray beam stabilization that integrates weak current detection, high-speed processing, and precision actuation subsystems. By balancing theoretical modeling, circuit optimization, and mechanical engineering, the platform advances high-precision beam stabilization technology, providing a foundation for applications requiring sub-nanometer stability in extreme X-ray experimental environments.
