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  • 1
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    Wolter Optics for Neutron Focusing (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Focusing optics based on Wolter optical geometries developed for x-ray grazing incidence beams can be designed for neutron beams. Wolter optics are formed by grazing incidence reflections from two concentric conic sections (for example, a paraboloid and a hyperboloid). This has transformed observational X-ray astronomy by increasing the sensitivity by many orders of magnitude for research in astrophysics and cosmology. To increase the collection area, many reflecting mirrors of different diameters are nested with a common focal plane. These mirrors are fabricated using nickel-electroformed replication techniques. We apply these ideas to neutron focusing using nickel mirrors. We show an initial test of a conical mirror using a beam of cold neutrons. key words: electroformed nickel replication, focusing optics, grazing angle incidence, mirror reflection, neutron focusing, Wolter optics
    Keywords: Optics
    Type: M10-0547 , To be published in Nuclear Instruments and Methods in Physics Research/Elsevier
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Grazing-Incidence Neutron Optics based on Wolter Geometries (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The feasibility of grazing-incidence neutron imaging optics based on the Wolter geometries have been successfully demonstrated. Biological microscopy, neutron radiography, medical imaging, neutron crystallography and boron neutron capture therapy would benefit from high resolution focusing neutron optics. Two bounce optics can also be used to focus neutrons in SANS experiments. Here, the use of the optics would result in lower values of obtainable scattering angles. The high efficiency of the optics permits a decrease in the minimum scattering vector without lowering the neutron intensity on sample. In this application, a significant advantage of the reflective optics over refractive optics is that the focus is independent of wavelength, so that the technique can be applied to polychromatic beams at pulsed neutron sources.
    Keywords: Optics
    Type: American Conference on Neutron Scattering; May 11, 2008 - May 15, 2008; Santa Fe, NM; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    An Evaluation of Grazing-Incidence Optics for Neutron Imaging (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The focusing capabilities of neutron imaging optic based on the Wolter-1 geometry have been successfully demonstrated with a beam of long wavelength neutrons with low angular divergence.. A test mirror was fabricated using an electroformed nickel replication process at Marshall Space Flight Center. The neutron current density gain at the focal spot of the mirror is found to be at least 8 for neutron wavelengths in the range from 6 to 20 A. Possible applications of the optics are briefly discussed.
    Keywords: Optics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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