An arm length stabilization system for KAGRA and future gravitational-wave detectors

Abstract

Modern ground-based gravitational wave (GW) detectors require a complex interferometer configuration with multiple coupled optical cavities. Since achieving the resonances of the arm cavities is the most challenging among the lock acquisition processes, the scheme called arm length stabilization (ALS) had been employed for lock acquisition of the arm cavities. We designed a new type of the ALS, which is compatible with the interferometers having long arms like the next generation GW detectors. The features of the new ALS are that the control configuration is simpler than those of previous ones and that it is not necessary to lay optical fibers for the ALS along the kilometer-long arms of the detector. Along with simulations of its noise performance, an experimental test of the new ALS was performed utilizing a single arm cavity of KAGRA. This paper presents the first results of the test where we demonstrated that lock acquisition of the arm cavity was achieved using the new ALS and residual noise was measured to be $8.2\mathrm{Hz}$ in units of frequency, which is smaller than the linewidth of the arm cavity and thus low enough to lock the full interferometer of KAGRA in a repeatable and reliable manner.

arXiv comment21 pages, 8figures

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Cited by in corpus (5)

• Performance of the KAGRA detector during the first joint observation with GEO 600 (O3GK)
• Vaidya and generalized Vaidya solutions by gravitational decoupling
• Improving the stability of frequency dependent squeezing with bichromatic control of filter cavity length, alignment and incident beam pointing
• A back-linked Fabry-Perot interferometer for space-borne gravitational wave observations
• Experimental demonstration of frequency downconverted arm length stabilization for a future upgraded gravitational wave detector