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  • SOLID-STATE PHYSICS  (5)
  • LUNAR AND PLANETARY EXPLORATION  (1)
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  • 1
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    Monocrystals for the investigation of gravity phenomena (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The usefulness for gravity experiments of monocrystals with very high mechanical quality factors is reviewed. Measurements carried on four point mechanical suspensions at liquid helium temperature are reported. Qs of 400 x 10 to the 6th have been measured for the longitudinal mode of sapphire and ruby crystals. A Q of 80 x 10 to the 6th was measured for the bending mode of a silicon crystal.
    Keywords: SOLID-STATE PHYSICS
    Type: Acta Astronautica; 9; Feb. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Solid state crystal physics at very low temperatures (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The properties of nearly perfect crystals was studied at cryogenic temperatures. A large Helium 3 and Helium 4 dilution refrigerator has been assembled, and is described. A cryostat suitable for cooling a 35 liter volume to .020 Kelvin was designed and constructed, together with instrumentation to observe the properties of nearly perfect crystals.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-CR-163240
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Preliminary measurements of quality factors of monocrystals (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: High Q's were obtained with silicon and sapphire crystals on four points mechanical suspensions. Instrumentation was developed to observe the approach to thermal equilibrium at cryogenic temperatures and to study thermal noise level and fluctuations. High Q crystals with low thermal noise level are promising candidates as high stability time references.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-CR-157211
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Properties of large nearly perfect crystals at very low temperatures (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A liquid helium cryostat of a size and construction unavailable commercially, was built for use in measuring the Q of several materials at milli-Kelvin temperatures. The design and testing of the cryostat is described as well as the design of the experiment vacuum chamber and adaptor for the dilution refrigerator insert. Theory, design, and testing are also discussed for the magnetic coils built to levitate the materials so as to isolate them and increase the measured Q. A four point suspension with capacitor end plates as the transducer was used to obtain preliminary Q measurements of 6061 aluminum alloy and single crystal silicon. Results are tabulated.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-CR-169894 , NAS 1.26:169894
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Lunar surface gravimeter experiment (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The lunar surface gravimeter used the moon as an instrumented antenna to search for gravitational waves predicted by Einstein's general theory of relativity. Tidal deformation of the moon was measured. Gravitational radiation is a channel that is capable of giving information about the structure and evolution of the universe.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-151203
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Solid state crystal physics at very low temperatures (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The mechanical dissipation (Q) and resonant frequency of a 15 kg silicon crystal were measured at cryogenic temperatures. In the experiment described, temperature control was incorporated to reduce the time derivative of the temperature. The results of the Q measurements with and without this temperature control are quite different. Measurements of the resonant frequency of the fundamental longitudinal mode of the silicon crystal from 6 to 300 Kelvin are presented and discussed with respect to temperature, df/dT. It is observed that frequency increases as temperature decreases down to about 16 Kelvin, i.e. dt/dT is negative. However, below this temperature the frequency decreases as temperature decreases, i.e. dt/dT is positive. It is suggested that this behavior is related to the coefficient of thermal contraction of silicon, which changes sign at 18 Kelvin. Continuation of these experiments to 20 mK is discussed.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-CR-164548
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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