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  • 1
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    Imaging X-ray spectrophotometers (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A new instrument which combines the good energy resolution of the gas scintillation proportional counter with the high position resolution of the microchannel plate is proposed. A study of the factors which determine the combined energy and position resolution of the new instrument is discussed. Submillimeter position resolution along with good energy resolution (8% fwhm at 6 keV) should be achievable.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Nuclear Instruments and Methods; 184; 1981
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A high resolution gas scintillation proportional counter for studying low energy cosmic X-ray sources (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: In recent years much effort has been devoted to the development of large area gas scintillation proportional counters (GSPCs) suitable for use in X-ray astronomy. The paper deals with a low-energy GSPC for use in detecting sub-keV X-rays from cosmic sources. This instrument has a measured energy resolution of 85 eV (FWHM) at 149 eV over a sensitive area of 5 sq cm. The development of imaging capability for this instrument is discussed. Tests are performed on the feasibility of using an arrangement of several phototubes placed adjacent to one another to determine event locations in a large flat counter. A simple prototype has been constructed and successfully operated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The Stellar X-ray Polarimeter - A focal plane polarimeter for the Spectrum X-Gamma mission (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper describes an X-ray polarimeter that will be flown on the Spectrum X-Gamma mission. The instrument exploits three distinct physical processes to measure polarization: Bragg reflection from a graphite crystal, Thomson scattering from a metallic lithium target, and photoemission from a cesium iodide photocathode. These three methods allow polarization measurements over an energy band from 0.3 to 12 keV. The polarimeter will make possible sensitive measurements of several hundred known X-ray sources. X-ray polarization measurements will make it possible to constrain the geometry of gas flow in X-ray binaries, identify nonthermal emission in supernova remnants, test current models for X-ray emission in radio pulsars, determine the radiation mechanisms in active galactic nuclei, and search for inertial frame dragging (Lense-Thirring effect) around the putative black hole in Cygnus X-1.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Engineering (ISSN 0091-3286); 29; 773-780
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    NASA TECHNICAL REPORTS
  • 4
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    Solar flare X-ray polarimeter utilizing a large area thin beryllium scattering disk (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A model of a solar flare X-ray polarimeter utilizing a large-area thin beryllium scattering disk was developed using Monte Carlo techniques for several classes of solar flares. The solar-flare polarimeter consists of a 30-cm-diam Be disk of about 1/3 of a scattering length thickness, which is surrounded by a cylindrical detector composed of six segmented panels of NaI scintillators, each coupled to 15 photomultiplier tubes. The instrument is sensitive to X-rays from 10 to 100 keV. For a class-M-2 solar flare observed for 10 sec from a balloon at an altitude of 150,000 ft, the minimum detectable polarization at the 99 percent statistical confidence level was found to be 1-6 percent over the energy range 20-100 keV.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: X-ray/EUV Optics for Astronomy and Microscopy; Aug 07, 1989 - Aug 11, 1989; San Diego, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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