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  • 1
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    Vacuum pumping system for spaceborne passive hydrogen masers (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The ultimate utility of hydrogen masers as highly accurate clocks aboard navigation satellites depends on the feasibility of making the maser lightweight, compact, and capable of a 5 to 7 year unattended operation. A vacuum pumping system for the maser that is believed to meet these criteria was designed and fabricated. The pumping system was fabricated almost completely from 6Al-4V titanium alloy and incorporates two or four sintered zirconium carbon getter pumps with integral activation heaters. The manner in which the getter pumps were mounted to insure that they will stand both the activation and the shock of launch is illustrated. Data on the total hydrogen capacity and pumping of this system is also presented.
    Keywords: LASERS AND MASERS
    Type: NASA. Goddard Space Flight Center Proc. of the 12th Ann. Precise Time and Time Interval Appl. and Planning Meeting; p 581-589
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Magnetic shielding and vacuum test for passive hydrogen masers (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Vibration tests on high permeability magnetic shields used in the SAO-NRL Advanced Development Model (ADM) hydrogen maser were made. Magnetic shielding factors were measured before and after vibration. Preliminary results indicate considerable (25%) degradation. Test results on the NRL designed vacuum pumping station for the ADM hydrogen maser are also discussed. This system employs sintered zirconium carbon getter pumps to pump hydrogen plus small ion pumps to pump the inert gases. In situ activation tests and pumping characteristics indicate that the system can meet design specifications.
    Keywords: LASERS AND MASERS
    Type: NASA. Goddard Space Flight Center Proc. of the 13th Ann. Precise Time and Time Interval (PTTI) Appl. and Planning Meeting; p 791-799
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A NASA high-power space-based laser research and applications program (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Applications of high power lasers are discussed which might fulfill the needs of NASA missions, and the technology characteristics of laser research programs are outlined. The status of the NASA programs or lasers, laser receivers, and laser propulsion is discussed, and recommendations are presented for a proposed expanded NASA program in these areas. Program elements that are critical are discussed in detail.
    Keywords: LASERS AND MASERS
    Type: NASA-SP-464 , NAS 1.21:464 , LC-83-600161
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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