2026/07/22 by Daiki Tanabe, Yuki Inoue, Mario Juvenal S. Onglao III
#astro-ph.IM #gr-qc #physics.ins-det
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× 10-8 N⋅m and actuation efficiency as 6.6× 10-13 rad/V, which are sufficiently large for controlling the CHRONOS torsion bar. The actuation noise was estimated as 5.3× 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%.