Results 211 to 220 of about 15,490 (252)

Orthogonal Mirror Telescopes for X-ray Astronomy

Applied Optics, 1971
Crossed mirror telescopes are presented as an alternative to the present telescope systems used in x-ray astronomy. These instruments generally have a higher x-ray collecting efficiency but a poorer angular resolution than the more conventional paraboloid-hyperboloid telescopes.
L P, Vanspeybroeck, R C, Chase, T F, Zehnpfennig   +2 more
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A Celestial X-ray Mirror

Science, 2013
Astronomy![Figure][1] CREDIT: M. L. MCCOLLOUGH, R. K. SMITH, L.A. VALENCIC, THE ASTROPHYSICAL JOURNAL 762 , 2 (1 JANUARY 2013) © 2013 THE AMERICAN ASTRONOMICAL SOCIETY. REPRODUCED BY PERMISSION OF AAS Bok globules, named after astronomer Bart Bok, are dense clouds of cold gas and dust ...
openaire   +1 more source

Stitching interferometry for ellipsoidal x-ray mirrors

Review of Scientific Instruments, 2016
Ellipsoidal mirrors, which can efficiently produce a two-dimensional focusing beam with a single mirror, are superior x-ray focusing optics, especially when compared to elliptical-cylinder mirrors in the Kirkpatrick–Baez geometry. However, nano-focusing ellipsoidal mirrors are not commonly used for x-ray optics because achieving the accuracy required ...
Hirokatsu Yumoto, Takahisa Koyama, Satoshi Matsuyama, Kazuto Yamauchi, Haruhiko Ohashi   +4 more
openaire   +3 more sources

Electroformed grazing incidence x-ray mirrors for a mirror array telescope

Applied Optics, 1987
Grazing incidence Wolter type I mirrors for higher-energy x rays have been replicated from two superpolished mandrels by electroforming. Single mirrors and a nested pair were tested with 1.5- and 6.4-keV x rays, and their subminute of arc resolution and reflectivity close to the theoretical values are confirmed.
M P, Ulmer, Y, Matsui, D K, Bedford, G M, Simnett, P Z, Takacs   +4 more
openaire   +2 more sources

Reflectivity test of X-ray mirrors for deep X-ray lithography

Microsystem Technologies, 2008
The reflectivity of grazing angle X-ray mirrors, used for X-ray deep lithography, is tested by means of a calorimetric method. A deviation in the reflectivity of a used mirror compared with the reflectivity of a clean surface is observed. This deviation is caused by an oxide layer on the mirrors surfaces.
Nazmov, V., Reznikova, E., Last, A., Börner, M., Mohr, J.   +4 more
openaire   +2 more sources

Multilayer X-ray interference mirrors in the ultrasoft X-ray region

Journal of Electron Spectroscopy and Related Phenomena, 1996
Abstract The angular dependences of reflection coefficients of ultrasoft X-Ray radiation by X-Ray interference mirrors were investigated for samples prepared by the method of magnetron sputtering. The theoretical evaluations of these reflection coefficients were compared with the obtained experimental results.
I.I. Lyakhovskaya, E.A. Bugaev
openaire   +1 more source

Structural analysis of multilayered x-ray mirrors by x-ray diffraction

SPIE Proceedings, 1995
Molibdenum-silicon multilayer structure as a soft x-ray mirror fabricated using a magnetron sputtering system has been studied through x-ray diffraction (XRD) of Cu K(alpha ) (1.54 angstrom) radiation. The angular positions, the relative intensities, the widths of Bragg primary and secondary peaks in XRD pattern are sensitive to structural parameters ...
Dong-Eon Kim, DongHo Cha
openaire   +1 more source

Soft X-ray Platinum-Carbon Multilayer Mirrors

SPIE Proceedings, 1986
Plane multilayer mirrors 5 cm in diameter and of different 2-D values have been fabricated from polycrystalline platinum and amorphous carbon. The performance of these multilayers at 0.834-nm wavelength has been measured as a function of layer number and thickness.
B L, Evans, B J, Kent
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X-ray mirror surfaces evaluated by an X-ray topographical technique

Nuclear Instruments and Methods in Physics Research, 1983
Abstract Topographic images have been taken with 8 and 16 keV X-rays on a variety of X-ray reflecting surfaces, e.g. a platinum mirror, silicon carbide mirror, uncoated float glass, and on a Layered Synthetic Microstructure (LSM). A fine slit produces a monochromatic diffraction image from the Cornell Electron Storage Ring (CESR).
D.C. Mancini, D.H. Bilderback
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Effect of high intensity pulsed X-rays on X-ray mirrors

Radiation Effects and Defects in Solids, 1993
Abstract The heating of various materials by X-ray pulses is studied. The relaxation of the excited electron subsystem of the material is investigated. A method for calculation of temperature distributions in the bulk of the material is developed and applied to different materials. The pulse length dependence has also been studied.
V. V. Beloshitsky, R. F. Fayazov, M. A. Kumakhov   +2 more
openaire   +1 more source