Sagittal X-ray beam deviation at asymmetric inclined diffractors

Korytár, D.; Hrdý, J.; Artemiev, Nikolay A.; Ferrari, C.; Freund, Andreas K.

doi:10.1107/s0909049501011050

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…The diffracted beam is deviated from the plane of diffraction in the sagittal direction by angle . such a splitting (Hrdý et al, 1998;Artemiev et al, 2000;Korytá r et al, 2001)]. After diffraction from the second roof-like surface this deviation is multiplied by 2.…”

Section: Proposalmentioning

confidence: 99%

Diffractive–refractive optics: X-ray splitter

Hrdý

2009

J Synchrotron Radiat

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The possibility of splitting a thin (e.g. undulator) X-ray beam based on diffraction-refraction effects is discussed. The beam is diffracted from a crystal whose diffracting surface has the shape of a roof with the ridge lying in the plane of diffraction. The crystal is cut asymmetrically. One half of the beam impinges on the left-hand part of the roof and the other half impinges on the right-hand side of the roof. Owing to refraction the left part of the beam is deviated to the left whereas the right part is deviated to the right. The device proposed consists of two channel-cut crystals with roof-like diffraction surfaces; the crystals are set in a dispersive position. The separation of the beams after splitting is calculated at a distance of 10 m from the crystals for various asymmetry and inclination angles. It is shown that such a splitting may be utilized for long beamlines. Advantages and disadvantages of this method are discussed.

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Section: Proposalmentioning

confidence: 99%

Diffractive–refractive optics: X-ray splitter

Hrdý

2009

J Synchrotron Radiat

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“…Their other wellknown property is the image expansion or compression in one dimension. The potential applications of Bragg diffraction optics based on asymmetric inclined diffractors have been evaluated as well [8].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional x-ray magnification based on a monolithic beam conditioner

Korytár¹,

Mikulı́k²,

Ferrari

et al. 2003

J. Phys. D: Appl. Phys.

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In x-ray imaging and beam conditioning it is useful to magnify or demagnify the x-ray beam, or an image, approaching (sub)micrometre resolution or the (sub)micrometre illuminated region. Using an asymmetric diffractor it is possible to expand or compress the x-ray beam in one direction. Combining two such diffractors with mutually perpendicular planes of diffraction even two-dimensional beam expansion or compression can be obtained and, for suitable wavelengths, it is even possible to design and cut a single crystal in such a way that it works as a monolithic device expanding or compressing the x-ray beam in two directions. In this paper, a new magnifying monolithic optical device for a two-dimensional magnification of 25 at 10 keV, based on two noncoplanar asymmetrically inclined {311} diffractors, was designed and made from a single silicon crystal. A ray-tracing image has been simulated to check the functionality of the device. The experimental testing of this device was performed at Optics beamline BM5 at ESRF Grenoble. An undistorted image magnification of about 15 was achieved at a photon beam energy of 9.6 keV. When the photon energy was increased, a higher magnification and increased distortion were observed (horizontal magnification of 39, vertical magnification of 20) at an energy of 10.045 keV. The advantages and disadvantages of the device, as well as further steps to improve it are briefly discussed.

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