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  • 1
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    A graphite crystal polarimeter for stellar X-ray astronomy. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The first crystal X-ray polarimeter to be used for X-ray astronomy is described. Polarization is measured by modulation of the X rays diffracted at an average 45 deg glancing angle from large, curved graphite crystal panels as these rotate about an axis parallel to the incident X-ray flux. Arrangement of the crystal panels, the design of the detector, and the signal-processing circuitry were optimized to minimize systematic effects produced by off-axis pointing of the rocket and cosmic ray induced events. The in-flight performance of the instrument in relation to the observed background signal is discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 43; July 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Columbia University OSO-8 instrument for stellar and solar X-ray spectroscopy and polarimetry (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A spectrometer and a polarimeter consisting of large-area panels of mosaic crystals have been constructed and prepared for use in the OSO-8 satellite. The instrumentation is planned for study of stellar and solar X-ray spectra between 1.8-8 keV and stellar X-ray polarization at 2.6 keV. Aspects of the design which enable the instrument to make measurements of the diverse range of stellar and solar phenomena are described. Some of the unique features, such as high sensitivity, high temporal resolution, and spectral range, are discussed. The applicability of the spectrometer and polarimeter to various current problems in X-ray astronomy is considered.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The graphite crystal X-ray spectrometer on OSO-8 (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The large-area graphite crystal X-ray spectrometer aboard the OSO-8 satellite is described. The instrument can be used to measure continuum profiles over the energy band from 2 to 8 keV with a resolution of several tens of electron volts and to detect narrow line emission from strong X-ray sources with a limiting sensitivity (3 sigmas) of the order of 10-eV, equivalent width for a three-day observing period.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Astrophysical Journal; 210; Dec. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A focusing gas scintillation proportional counter (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An improved large-area gas scintillation proportional counter has been built, suitable for use in X-ray astronomy. This counter employs electron focusing in a drift region to achieve uniform response. It is shown that a window area of 60 sq cm and a spectral resolution of 10% fwhm or better at 5.9 keV can be obtained.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Nuclear Instruments and Methods; 144; 1977
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    NASA TECHNICAL REPORTS
  • 5
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    Recent developments in parallel-grid, gas-scintillation proportional counters (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The problems of developing large-area, gas-scintillation proportional counters with high resolution are considered. It is found that simple large-area, parallel-grid proportional counters suffer from a variation in gain over the counter window. Some success has been achieved in overcoming this problem by focusing the charge cloud as it drifts into the multiplication region. Measurements are reported for various mixtures of argon and xenon as well as pure xenon.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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    NASA TECHNICAL REPORTS
  • 6
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    A large area Thomson-scattering stellar X-ray polarimeter. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An instrument for measuring the polarization of stellar X-ray emission has been designed, constructed, and tested. The polarization dependence of incoherent Thomson scattering in lithium metal is utilized. Means for suppression of cosmic ray background effects have been provided. The apparatus has been flown in rockets to obtain data in the polarization of X-ray sources in Sco X-1 and Tau X-1.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AD-736550 , AFOSR-72-0287TR , New techniques in space astronomy; Symposium; Aug 10, 1970 - Aug 14, 1970; Munich
    Format: text
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