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  • 1
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    Measurement of a high electrical quality factor in a niobium resonator for a gravitational radiation detector (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: 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 x 10 to the 6th, and 3.8 x 10 to the 6th, 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.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Applied Physics (ISSN 0021-8979); 65; 887-892
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Very high-vacuum heat treatment facility (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A vacuum heat treatment facility, with hot zone dimensions of 12 x 19 x 19 cm, has been designed and constructed at a cost substantially below that of a commercial unit. The design incorporates efficient water cooling and a resistive heating element. A vacuum pressure of 1.5 x 10 to the -8th torr at room temperature has been obtained after baking. The temperature limit is approximately 1900 C. This limit results from the choice of niobium as the hot zone material.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments (ISSN 0034-6748); 58; 2288-229
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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