Slow drift suppression of continuous laser carrier synchronization system
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摘要: 高精度同步系统是加速器产生高品质束流的关键因素之一，基于清华大学已有的连续激光载波同步系统，对不同接收端之间参考微波信号相位差的长时漂移，即同步系统慢漂进行了研究，提出了一种基于接收端参考微波信号幅值的电光调制器（EOM）偏置电压控制方法抑制慢漂。采用该方法后，清华大学甚高频光阴极电子枪测试平台L波段（1 300 MHz）同步系统慢漂被抑制到10.45 fs@24 h，清华大学汤姆逊散射装置（TTX）S波段（2 856 MHz）同步系统慢漂被抑制到10.53 fs@24 h，并且该方法可以使整套同步系统工作于室温环境，有效地提高了同步系统对工作环境温度的适应性。Abstract: The high-precision synchronization system is one of the key factors for the accelerator to generate high-quality beams. Based on the existing continuous laser carrier synchronization system of Tsinghua University, this paper analyzes the long-term drift of the reference microwave signal phase difference between different receiving ends, that is, the slow drift of the synchronization system. An electro-optic modulator (EOM) bias voltage control method based on the amplitude of the reference microwave signal at the receiving end was proposed to suppress the slow drift. After adopting this method, the slow drift of the L-band (1300 MHz) synchronization system of Tsinghua University’s VHF band photocathode electron gun test platform was suppressed to 10.45 fs@24 h, and the slow drift of the S-band (2 856 MHz) synchronization system of Tsinghua University’s Thomson Scattering Facility (TTX) was suppressed to 10.53 fs@24 h. Moreover, this method can make the entire synchronization system work in a room temperature environment, effectively improving the adaptability of the synchronization system to the working environment temperature.
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Key words:
- synchronization system /
- accelerator /
- continuous laser carrier /
- slow drift
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图 1 连续激光载波同步系统示意图
Figure 1. Schematic diagram of continuous laser carrier synchronization system
图 2 EOM驱动电压-输出光强调制曲线
Figure 2. Curve of EOM driving voltage-output light intensity modulation
图 7 L波段同步系统慢漂测试结果
Figure 7. Result of synchronous system slow drift test on L wave-band
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