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  • 1
    Electronic Resource
    Electronic Resource
    Very high-vacuum heat treatment facility (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 2288-2291 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have designed and constructed a vacuum heat treatment facility, with hot zone dimensions of 12×19×19 cm, 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 1.5×10−8 Torr at room temperature has been obtained after baking. The temperature limit is approximately 1900 °C. This limit results from our choice of niobium as the hot zone material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139338
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Instrumentation of a resonant gravitational radiation detector with a planar thin-film dc SQUID (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 5190-5196 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The instrumentation of a low-temperature three-mode gravitationa1 radiation antenna incorporating a low-noise dc SQUID provided by IBM is described. The feedback circuitry necessary to maintain the linearity and dynamic range of the SQUID was found to drive the resonant system due to high coupling between the input coil and the feedback coil of the SQUID. In order for this type of planar thin-film dc SQUID to be useful for gravitational radiation detectors and other applications requiring high Q input circuits, a solution to this feedback problem is needed. To this end, the nonlinear equations describing the dc SQUID with linear feedback are solved in terms of an isolated SQUID. The important feedback parameters for a high Q resonant system are found to be the slew rate of the electronics and the coupling constant ratio α2if/α2f, where α2if is the energy coupling efficiency between the feedback coil and input coil and α2f is the energy coupling efficiency between the feedback coil and the SQUID loop. Methods to reduce the effect of the feedback on the input circuit are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343149
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of a high electrical quality factor in a niobium resonator for a gravitational radiation detector (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 887-892 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342989
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