Development of advanced photon calibrator for Kamioka gravitational wave detector (KAGRA)

• DOI: 10.1063/5.0147888
• Publication Date: 2023-07-27T12:35:48Z
• Authors: Y. Inoue; B. H. Hsieh; K. H. Chen; Y. K. Chu; K. Ito; C. Kozakai; T. Shishido; Y. Tomigami; T. Akutsu; S. Haino; K. Izumi; T. Kajita; N. Kanda; C. S. Lin; F. K. Lin; Y. Moriwaki; W. Ogaki; H. F. Pang; T. Sawada; T. Tomaru; T. Suzuki; S. Tsuchida; T. Ushiba; T. Washimi; T. Yamamoto; T. Yokozawa
• Keywords: Physics - Instrumentation and Detectors; 0103 physical sciences; FOS: Physical sciences; Instrumentation and Detectors (physics.ins-det); Astrophysics - Instrumentation and Methods for Astrophysics; 01 natural sciences; 7. Clean energy; Instrumentation and Methods for Astrophysics (astro-ph.IM)

The Kamioka Gravitational wave detector (KAGRA) cryogenic gravitational-wave observatory has commenced joint observations with the worldwide gravitational network. Precise calibration of response is essential for accurately estimating parameters sources. A photon calibrator a crucial tool used in laser interferometer observatory, Virgo, and KAGRA, it was utilized observation 3 GEO600 Germany April 2020. In this paper, KAGRA implemented three key enhancements: high-power laser, power stabilization system, remote beam position control. employs 20 W divided into two beams that are injected onto mirror surface. By utilizing at kHz frequencies can be calibrated. To independently control each beam, an optical follower servo installed stabilization. path calibrator's positions controlled using pico-motors, allowing characterization detector's rotation response. Additionally, telephoto camera quadrant photodetectors were to monitor positions, optimize we discuss statistical errors associated measurement relative noise. We also address systematic related model simulation elastic deformation effects finite element analysis. Ultimately, have successfully reduced total error from 2.0%.