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  • 1
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    Construction of a multilayered X-ray telescope for solar coronal studies from space (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The construction and testing of soft x-ray Ritchey-Chretien aplanatic telescope which is to be flown on a NASA sounding rocket in 1986 for very high resolution studies of the solar corona are discussed. Goals include figuring, polishing and measuring the mirror surfaces to tolerances exceding the 5000 A wavelength diffraction limit while achieving a superpolished surface finish, and the development of a structural design to withstand the rigors of the launch. Multilayer coatings are used to achieve usable reflectivity in the soft X-ray regime, and the design goal is for spatial resolution of 1/4 sec. Future applications are discussed.
    Keywords: ASTRONOMY
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    NASA TECHNICAL REPORTS
  • 2
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    Imaging performance of a normal incidence soft X-ray telescope (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Measurements are presented of the imaging performance of a normal incidence spherical soft X-ray mirror at BK-alpha (67.6 A). The reflector was a 124-layer coating consisting of alternating Re-W alloy and C layers with a protective C overcoat 34 A thick deposited on a Zerodur substrate. Measurements made at an angle of 1.5 deg off axis with the prototype of the Einstein Observatory high resolution imager reveal the resolution of the mirror to be about 1 arcsec FWHM, with 50% of the reflected power within the detector field of 512 arcsec contained within a diameter of 5 arcsec. The data demonstrate the practicality and potential good performance of normal-incidence soft X-ray optics, and show that the scattering performances of such devices may be as good or better than the best grazing incidence devices.
    Keywords: ASTRONOMY
    Type: Applied Physics Letters; 40; Jan. 1
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    NASA TECHNICAL REPORTS
  • 3
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    Normal-incidence soft X-ray telescopes (1991)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Photos obtained during 5 min of observation time from the flight of a 25-cm-diameter normal-incidence soft-X-ray (63.5 A) telescope on September 11, 1989, are analyzed, and the data are compared to the results expected from tests of the mirror surfaces. These tests cover a range of spatial periods from 25 cm to 1 A. The photos demonstrate a resolution close to the photon shot-noise limit and a reduction in the scattering of the multilayer mirror compared to a single surface for scattering angles above 1 arcmin, corrresponding to surface irregularities with spatial periods below 10 microns. These results are used to predict the possible performance of future telescopes. Sounding rocket observations might be able to reach a resolution around 0.1 arcsec.
    Keywords: ASTRONOMY
    Type: Optical Engineering (ISSN 0091-3286); 30; 1109-111
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    NASA TECHNICAL REPORTS
  • 4
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    Filters for soft X-ray solar telescopes (1990)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Soft X-ray telescopes require filters that block visible and infrared light and have good soft X-ray transmission. The optical properties of possible materials are discussed, and the fabrication and testing methods for the filters used in a 10-inch normal incidence telescope for 63 A are described. The best performances in the 44-114-A wavelength range are obtained with foils of carbon and rhodium.
    Keywords: ASTRONOMY
    Type: Optical Engineering (ISSN 0091-3286); 29; 625-631
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    NASA TECHNICAL REPORTS
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