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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.

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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.

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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.
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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
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2076
Deposited By: Archive Administrator
Deposited On:06 Mar 2006
Last Modified:08 Nov 2021 19:45

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