An X-ray monochromator with 1.65 meV energy resolution
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Monochromator
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Radiation flux
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The concept of a focusing monochromator with high energy resolution is presented. Different from conventional optical schemes, the device exploits not the angular but the spatial dispersion of synchrotron radiation. The wave theory of the monochromator is developed; it shows that the monochromator can reach an energy resolution of about 0.1 meV without significant loss of the spectral density of synchrotron radiation.
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High-energy X-rays
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Asymmetric channel-cut monochromators have been tested at the SRS. Results from both focused and unfocused beamlines have shown a threefold improvement in flux when compared with the flux obtained from a symmetric cut Si(111) monochromator. Some problems with using such monochromators and possible modifications are described.
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Undulator
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A grating monochromator particularly designed for use with a distant synchrotron radiation source is described. It has two reflections and a constant deviation and is intended to suppress higher spectral orders in its output. Measurements are presented which determine its resolution, efficiency and order sorting capability, and a comparison is also made with other instruments currently being designed for or in use with synchrotron radiation sources.
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High-energy X-rays
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Position (finance)
High-energy X-rays
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Monochromatic color
X-ray optics
Spectral resolution
Soft X-rays
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Performance tests were carried out on a varied line-spacing plane grating monochromator at BL27SU of SPring-8 in the higher energy region using photoabsorption spectra of gas and solid samples and photoelectron spectra of Xe 5p3/2. A flux of 1×1011 photons/s/100 mA/0.02% b.w. was achieved at 2 keV. The photon flux steeply decreased above 2 keV to 5×109 photons/s/100 mA/0.02% b.w. at 2.8 keV.
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SPring-8
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Line (geometry)
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Zone plate
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A high-flux and high-resolution VUV beamline (4–40 eV) has been designed and is under construction at SRRC. This beamline, which collects 50 mrad of horizontal radiation, uses a 6 m cylindrical-grating monochromator with an incident angle of 70° instead of the conventional normal-incidence-monochromator (NIM) design. Special features, such as movable entrance slit, bendable vertical focusing mirror and movable curved exit slit, are employed to enhance greatly the beamline performance. With both slit openings set at 10 µm, the energy-resolving power can reach as high as 70000. Photon fluxes of 1 × 10 13 and 1 × 10 10 photons s −1 are calculated for energy-resolving powers of 1000 and 40000, respectively. The best image size at the sample position is smaller than 0.45 × 0.2 mm.
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Photon flux
High-energy X-rays
Radiation flux
Photon energy
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