用于CHRONOS引力波探测器的光子压力致动器悬架控制中的降噪
Noise reduction in suspension control with photon-pressure actuator for CHRONOS gravitational wave detector
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中文总结 AI 辅助
研究旨在提高引力波探测器亚赫兹灵敏度，提出用光子压力致动器隔离噪声，设计其光学布局并用于CHRONOS实验，估算出相关参数，其驱动噪声低于目标灵敏度，用作校准器时系统误差为1.14%。
中文摘要 AI 辅助
提高引力波（GW）探测器的亚赫兹灵敏度对于探测更重的双黑洞合并和研究强引力场中的现象很重要。基于扭杆的GW探测器已被设计用于关注低频GW。在GW探测器的噪声源中，由力源振动和环境磁场波动引起的驱动噪声是低频下增加的一种。本研究提出光子压力致动器作为将致动器与地震和磁噪声隔离的解决方案，它还可作为光子校准器。设计了具有四个独立控制光束的光子压力致动器的光学布局并应用于CHRONOS实验。基于实际功率控制系统，估计其在偏航旋转轴周围的最大扭矩幅度为\(1.0\times 10^{-8}\)N·m，驱动效率为\(6.6\times 10^{-13}\)rad/V，足以控制CHRONOS扭杆。在1Hz时驱动噪声估计为\(5.3\times 10^{-19}\)rad \({\rm Hz}^{-1/2}\)，低于CHRONOS的目标灵敏度。假设用作光子校准器，估计的系统误差为1.14%。
英文摘要
Improving sub-Hz sensitivity of gravitational wave (GW) detectors is important to detect heavier binary black hole mergers and study phenomena in stronger gravity fields. Torsion-bar-based GW detectors have been projected to focus on low-frequency GW. Among noise sources of GW detector, actuation noise induced by vibration of force sources and fluctuation of environmental magnetic fields is one that increases in low frequency. In this study, we propose photon-pressure actuator as a solution to isolate an actuator from seismic and magnetic noise. It can also be used as a photon calibrator. We designed an optical layout of the photon-pressure actuator having four beams independently controlled and applied it to CHRONOS experiment. Based on a realistic power control system, we estimated its maximum torque amplitude around yaw rotation axis as $1.0\times 10^{-8}$ N$\cdot$m and actuation efficiency as $6.6\times 10^{-13}$ rad/V, which are sufficiently large for controlling the CHRONOS torsion bar. The actuation noise was estimated as $5.3\times 10^{-19}$ rad ${\rm Hz}^{-1/2}$ at 1 Hz, lower than the target sensitivity of CHRONOS. Assuming its usage as a photon calibrator, the estimated systematic error was 1.14%.
