CaltechAUTHORS
  A Caltech Library Service

Measurements of mechanical Q in levitated paramagnetic crystals

Augst, S. J. and Drever, R. W. P. (2000) Measurements of mechanical Q in levitated paramagnetic crystals. In: Gravitational Waves: Third Edoardo Amaldi Conference, Pasadena, California, USA, 12-16 July 1999. American Institute of Physics Conference Proceedings. No.523. American Institute of Physics , Melville, NY, pp. 338-341. ISBN 1563969440. http://resolver.caltech.edu/CaltechAUTHORS:AUGaipcp00

[img] PDF - Published Version
See Usage Policy.

324Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:AUGaipcp00

Abstract

Thermal noise from test masses, arising both from internal noise in the test mass material and from losses in the suspension wires and their attachments, is a significant factor limiting sensitivity of interferometric gravity-wave detectors. To investigate ways of reducing these noise sources we are using magnetic levitation in place of suspension wires. A search for high-Q crystals with magnetic properties allowing tests in moderate field strengths has led us to paramagnetic crystals, and we report preliminary results with small levitated samples of Gadolinium Gallium Garnet (GGG) and Terbium Gallium Garnet (TGG). The technique seems the first to allow Q measurements with no mechanical contact, and may facilitate work aimed at reducing thermal noise.


Item Type:Book Section
Additional Information:©2000 American Institute of Physics. We would like to acknowledge valuable discussions with J. L. Hall and R.E. Cowen, and H. J. Kimble for some early material samples. This research is based upon work supported by the National Science Foundation under Grant number PHY-9722112, and the California Institute of Technology.
Funders:
Funding AgencyGrant Number
NSFPHY-9722112
CaltechUNSPECIFIED
Subject Keywords:paramagnetic materials; garnets; mechanical properties; Q-factor; magnetic levitation; mechanical variables measurement; thermal noise; gravitational wave detectors
Series Name:American Institute of Physics Conference Proceedings
Issue or Number:523
Record Number:CaltechAUTHORS:AUGaipcp00
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:AUGaipcp00
Alternative URL:http://dx.doi.org/10.1063/1.1291877
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2076
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:06 Mar 2006
Last Modified:16 Dec 2015 22:37

Repository Staff Only: item control page