A Caltech Library Service

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

Akutsu, T. and Arai, K. and Kumar, R. (2020) An arm length stabilization system for KAGRA and future gravitational-wave detectors. Classical and Quantum Gravity, 37 (3). Art. No. 035004. ISSN 0264-9381. doi:10.1088/1361-6382/ab5c95.

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


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. We also demonstrated that the root mean square of residual noise was measured to be 8.2 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Akutsu, T.0000-0003-0733-7530
Arai, K.0000-0001-8916-8915
Additional Information:© 2020 IOP Publishing Ltd. Received 2 October 2019, revised 27 November 2019; Accepted for publication 28 November 2019; Published 13 January 2020. This work was supported by MEXT, JSPS Leading-edge Research Infrastructure Program, JSPS Grant-in-Aid for Specially Promoted Research 26000005, MEXT Grant-in-Aid for Scientific Research on Innovative Areas 24103005, JSPS Core-to-Core Program, A. Advanced Research Networks, the joint research program of the Institute for Cosmic Ray Research, University of Tokyo, National Research Foundation (NRF) and Computing Infrastructure Project of KISTI-GSDC in Korea, the LIGO project, and the Virgo project.
Funding AgencyGrant Number
Ministry of Education, Culture, Sports, Science and Technology (MEXT)24103005
Japan Society for the Promotion of Science (JSPS)26000005
University of TokyoUNSPECIFIED
National Research Foundation of KoreaUNSPECIFIED
Subject Keywords:gravitational-wave detector, interferometer, multi-colour
Issue or Number:3
Record Number:CaltechAUTHORS:20200113-105932393
Persistent URL:
Official Citation:T Akutsu et al 2020 Class. Quantum Grav. 37 035004
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100674
Deposited By: Tony Diaz
Deposited On:13 Jan 2020 19:17
Last Modified:12 Jul 2022 19:43

Repository Staff Only: item control page