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An instrument to measure mechanical up-conversion phenomena in metals in the elastic regime

Vajente, G. and Quintero, E. A. and Ni, X. and Arai, K. and Gustafson, E. K. and Robertson, N. A. and Sanchez, E. J. and Greer, J. R. and Adhikari, R. X. (2016) An instrument to measure mechanical up-conversion phenomena in metals in the elastic regime. Review of Scientific Instruments, 87 (6). Art. No. 065107. ISSN 0034-6748. http://resolver.caltech.edu/CaltechAUTHORS:20160615-160058302

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Abstract

Crystalline materials, such as metals, are known to exhibit deviation from a simple linear relation between strain and stress when the latter exceeds the yield stress. In addition, it has been shown that metals respond to varying external stress in a discontinuous way in this regime, exhibiting discrete releases of energy. This crackling noise has been extensively studied both experimentally and theoretically when the metals are operating in the plastic regime. In our study, we focus on the behavior of metals in the elastic regime, where the stresses are well below the yield stress. We describe an instrument that aims to characterize non-linear mechanical noise in metals when stressed in the elastic regime. In macroscopic systems, this phenomenon is expected to manifest as a non-stationary noise modulated by external disturbances applied to the material, a form of mechanical up-conversion of noise. The main motivation for this work is for the case of maraging steel components (cantilevers and wires) in the suspension systems of terrestrial gravitational wave detectors. Such instruments are planned to reach very ambitious displacement sensitivities, and therefore mechanical noise in the cantilevers could prove to be a limiting factor for the detectors’ final sensitivities, mainly due to non-linear up-conversion of low frequency residual seismic motion to the frequencies of interest for the gravitational wave observations. We describe here the experimental setup, with a target sensitivity of 10^(−15) m/√Hz in the frequency range of 10–1000 Hz, a simple phenomenological model of the non-linear mechanical noise, and the analysis method that is inspired by this model.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.4953114DOIArticle
http://scitation.aip.org/content/aip/journal/rsi/87/6/10.1063/1.4953114PublisherArticle
ORCID:
AuthorORCID
Greer, J. R.0000-0002-9675-1508
Adhikari, R. X.0000-0002-5731-5076
Additional Information:© 2016 AIP Publishing. Received 24 March 2016; accepted 19 May 2016; published online 10 June 2016. We would like to thank the members from the Seismic Isolation and Suspension Working Group in the LIGO Scientific Collaboration for many enriching discussions. Also many thanks to Seiji Kawamura, Yuri Levin, and Rai Weiss for valuable contributions to the initial experiment, and to Federico Paoletti for help in the design of the electronics. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation, and operates under cooperative agreement PHY-0757058. Advanced LIGO was built under Award No. PHY-0823459. This paper carries LIGO Document No. LIGO-P1500272. This manuscript has an internal LIGO project designation of P1500272. J.R.G. gratefully acknowledges the financial support of NSF No. DMR-1204864.
Group:LIGO
Funders:
Funding AgencyGrant Number
NSFPHY-0757058
NSFPHY-0823459
NSFDMR-1204864
Other Numbering System:
Other Numbering System NameOther Numbering System ID
LIGO DocumentLIGO-P1500272
Record Number:CaltechAUTHORS:20160615-160058302
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160615-160058302
Official Citation:An instrument to measure mechanical up-conversion phenomena in metals in the elastic regime Vajente, G. and Quintero, E. A. and Ni, X. and Arai, K. and Gustafson, E. K. and Robertson, N. A. and Sanchez, E. J. and Greer, J. R. and Adhikari, R. X., Review of Scientific Instruments, 87, 065107 (2016), DOI:http://dx.doi.org/10.1063/1.4953114
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67953
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Jun 2016 23:08
Last Modified:15 Jun 2016 23:08

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