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The mechanical and electrical quality factors of a 10‐g niobium resonator were measured at 4.4 K and were found to be 8.1×106, and 3.8×106, respectively. The value for the electrical quality factor is high enough for a system operating at 50 mK at a sensitivity level of one phonon. The resonator’s low damping properties make it suitable for use as a transducer for a cryogenic three‐mode gravitational radiation detector. A practical design is given for the mounting of the resonator on a 2400‐kg aluminum‐bar detector. Projections are made for the sensitivity of a 2400‐kg bar instrumented as a three‐mode system with this resonator inductively coupled to a SQUID.
Published in:
Journal of Applied Physics
(Volume:65
,
Issue:
3
)
Date of Publication: Feb 1989
- Page(s):
- 887 - 892
- ISSN :
- 0021-8979
- Digital Object Identifier :
- 10.1063/1.342989
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 07 July 2009
- Issue Date :
- Feb 1989
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