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  • 1
    Electronic Resource
    Electronic Resource
    One-dimensional focusing of synchrotron x-ray radiation with curved arrays of reflectors : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2197-2199 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present results of the experimental tests of various arrays of reflectors acting as x-ray optical elements. Planar reflectors were arranged in a vertical stack and aligned with a common center of curvature to create a focusing array with cylindrical curvature. The experiments were carried out using x-ray radiation in the spectral range 3.5–7 keV produced at beam line X-27C of the National Synchrotron Light Source at Brookhaven National Laboratory. The focal distribution had a width of 8 mm and a maximum intensity gain of 7.3, as measured with a 0.4 mm diameter pinhole. An x-ray beam splitter consisting of arrays of reflectors has also been designed and tested. The separation of x-ray beams is 40 mrad, and the intensity of each of the two beams is about 0.32 of the original x-ray beam. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145704
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  • 2
    Electronic Resource
    Electronic Resource
    Coherence measurement technique for short-wavelength light sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2146-2151 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper proposes and analyzes a technique that will allow the spatial coherence properties of short-wavelength radiation sources to be measured. The technique is based on the analysis of the partially coherent diffraction patterns produced by a uniformly redundant array.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143130
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of an elliptical fiber mode field using near-field microscopy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 5514-5517 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Near-field scanning optical microscopy is used to determine the field structure within a noncircularly symmetric optical fiber. The output from an elliptical core fiber is measured and found to be in good agreement with the field predicted using a point matching method and fiber parameters determined from the preform. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359255
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of optical fibers using near-field scanning optical microscopy (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2753-2756 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method of determining the field distribution within an optical fiber of arbitrary refractive index profile using near-field scanning optical microscopy is described. The 3D intensity distribution emerging from the end of a cleaved fiber is measured by scanning a subwavelength aperture through the distribution, and the field within the fiber is inferred from this information. In the case of a single-mode step-index fiber, results are found to agree with a Gaussian modal distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356212
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  • 5
    Electronic Resource
    Electronic Resource
    Field characterization of a D-shaped optical fiber using scanning near-field optical microscopy (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 510-513 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Scanning near-field optical microscopy is used to measure the mode profile and evanescent field of a Ge-doped D-shaped optical fiber. The structure of the fiber is determined by differential etching followed by an investigation of the resultant topography with an atomic force microscope. This information is then used to theoretically model the expected behavior of the fiber and it is shown that the theoretical results are in excellent agreement with the experimentally observed field. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365608
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  • 6
    Electronic Resource
    Electronic Resource
    Penumbral neutron imaging—optimization and simulation (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 1289-1294 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper describes the optimization of the penumbral neutron imaging camera. The optimum parameters are qualified by practical considerations and the resulting camera is tested using a full Monte Carlo simulation. It is shown that an object emitting only 1.3×1010 neutrons/resolution element should be imageable. This result is confirmed by simulations of three different object shapes which indicate that the shape of the core of a compressed inertial confinement fusion pellet may be determined by this technique. It is further shown that these results correspond to the lowest possible imageable yield for any coded-aperture technique using the parameters assumed here. Finally, an alternative aperture and detector arrangement is briefly described which may lower the imageable yield by more than an order of magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337298
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  • 7
    Electronic Resource
    Electronic Resource
    Application of penumbral imaging to thermonuclear neutrons (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 2508-2515 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper describes a study investigating the possible application of penumbral imaging to thermonuclear neutrons generated in experiments on inertial confinement fusion. It is shown that the approach will allow neutron yields as low as 1011 to be imaged with better than 10-μm resolution over a 50-μm field of view. This performance is such that penumbral imaging of neutrons may provide an important diagnostic in near term fusion experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335928
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  • 8
    Electronic Resource
    Electronic Resource
    X-ray focusing using square channel-capillary arrays (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1542-1561 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A class of imaging, condensing, and collimating devices for x rays is investigated which is based on the use of an array of small channels of square cross section. The focusing and collimating effect arises from external reflection of near-grazing-incidence rays at the interior channel surfaces. Rays are redirected by being singly reflected from two orthogonal channel surfaces and are imaged from a source point to a square region with a side length MT+1 times that of the channel side length, where MT is the transverse magnification. The image and source locations are related by a thin-lens formula. The point spread function and the efficiency of these focusing devices are calculated. Two energy regimes with different channel reflectivity characteristics are examined in detail: the hard x-ray regime (E〉8 keV) and the soft x-ray regime (E〈200 eV). For these cases the efficiency of focusing x rays depends only on the channel aspect ratio and reflectivity parameters. A discussion is made of channel plates of other configurations, such as arrays of rectangular channels. The results are supported by Monte Carlo simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142432
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  • 9
    Electronic Resource
    Electronic Resource
    Neutron imaging of inertial confinement fusion targets at Nova (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1694-1696 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Images of the neutron-emitting region of high-yield inertial confinement fusion targets have been obtained with a penumbral coded-aperture imaging system. The major components of the imaging system are the penumbral aperture, neutron detector, alignment hardware, and image reconstruction software. We describe these components and present an example of the neutron imaging results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140136
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  • 10
    Electronic Resource
    Electronic Resource
    Coded imaging of thermonuclear neutrons (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1658-1663 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Imaging of thermonuclear neutrons from inertial confinement fusion pellets is reviewed. The most promising technique, penumbral imaging, is discussed in detail and the design criteria are outlined. Simulations are presented. More advanced aspects are also briefly discussed, such as nonlinear image reconstruction algorithms and more complex apertures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140125
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