Candidates for a possible third-generation gravitational wave detector: comparison of ring-Sagnac and sloshing-Sagnac speedmeter interferometers

Huttner, S.H. et al. (2017) Candidates for a possible third-generation gravitational wave detector: comparison of ring-Sagnac and sloshing-Sagnac speedmeter interferometers. Classical and Quantum Gravity, 34(2), 024001. (doi: 10.1088/1361-6382/34/2/024001)

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Speedmeters are known to be quantum non-demolition devices and, by potentially providing sensitivity beyond the standard quantum limit, become interesting for third generation gravitational wave detectors. Here we introduce a new configuration, the sloshing-Sagnac interferometer, and compare it to the more established ring-Sagnac interferometer. The sloshing-Sagnac interferometer is designed to provide improved quantum noise limited sensitivity and lower coating thermal noise than standard position meter interferometers employed in current gravitational wave detectors. We compare the quantum noise limited sensitivity of the ring-Sagnac and the sloshing-Sagnac interferometers, in the frequency range, from 5 Hz to 100 Hz, where they provide the greatest potential benefit. We evaluate the improvement in terms of the unweighted noise reduction below the standard quantum limit, and by finding the range up to which binary black hole inspirals may be observed. The sloshing-Sagnac was found to give approximately similar or better sensitivity than the ring-Sagnac in all cases. We also show that by eliminating the requirement for maximally-reflecting cavity end mirrors with correspondingly-thick multi-layer coatings, coating noise can be reduced by a factor of approximately 2.2 compared to conventional interferometers.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Spencer, Mr Andrew and Pascucci, Daniela and Bell, Dr Angus and Hild, Professor Stefan and Barr, Dr Bryan and Sorazu Lucio, Dr Borja and Leavey, Mr Sean and Wright, Ms Jennifer and Houston, Mr Ewan and Zhang, Teng and Graef, Dr Christian and Danilishin, Dr Stefan and Hennig, Mr Jan-Simon and Steinlechner, Dr Sebastian and Huttner, Dr Sabina and Strain, Professor Kenneth
Authors: Huttner, S.H., Danilishin, S.L., Barr, B., Bell, A.S., Gräf, C., Hennig, J.S., Hild, S., Houston, E.A., Leavey, S.S., Pascucci, D., Sorazu, B., Spencer, A.P., Steinlechner, S., Wright, J.L., Zhang, T., and Strain, K.A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Classical and Quantum Gravity
Publisher:IOP Publishing
ISSN (Online):1361-6382
Published Online:20 December 2016
Copyright Holders:Copyright © 2016 IOP Publishing Ltd
First Published:First published in Classical and Quantum Gravity 34(2): 023001
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
624341Investigations in Gravitational Radiation / Particle Astrophysics Capital equipmentSheila RowanScience & Technologies Facilities Council (STFC)ST/L000946/1S&E P&A - PHYSICS & ASTRONOMY