Crystal spectroscopy of x-ray synchrotron source brightness

Jens Aage Als-Nielsen; K. Kjær

doi:10.1016/0168-9002(92)90015-V

Crystal spectroscopy of x-ray synchrotron source brightness

Jens Aage Als-Nielsen, K. Kjær

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Photon intensities in a monochromatic beam obtained by a horizontal Bragg reflection of synchrotron radiation by a monochromator crystal are compared for the three perfect crystals: silicon and germanium in symmetric (111) reflection and Diamond (C∗) in asymmetric (111) transmission geometry. Consistent results are obtained within relative bandwidths spanning a factor of 50 from Si(333) to Ge(111) and within a wavelength range form 0.4 Å to 1.6 Å.

Results using a mosaic Be crystal within the same wavelength range depend in this work on a model of the mosaicity of the Be crystal. However, if the reflectivity of the Be crystal is determined experimentally for a few selected wavelengths, it is not necessary to invoke a mosaic model and a Be crystal may serve the purpose of characterizing the synchrotron beam as well as a perfect crystal.

Thin diamond and beryllium crystals in transmission are particularly convenient for spectroscopy of very powerful beams from third generation synchrotron sources, because these low-Z elements absorb only a tiny fraction of the beam power.

Original language	English
Journal	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	323
Issue number	3
Pages (from-to)	686-693
ISSN	0168-9002
DOIs	https://doi.org/10.1016/0168-9002(92)90015-V
Publication status	Published - 1992

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title = "Crystal spectroscopy of x-ray synchrotron source brightness",

abstract = "Photon intensities in a monochromatic beam obtained by a horizontal Bragg reflection of synchrotron radiation by a monochromator crystal are compared for the three perfect crystals: silicon and germanium in symmetric (111) reflection and Diamond (C∗) in asymmetric (111) transmission geometry. Consistent results are obtained within relative bandwidths spanning a factor of 50 from Si(333) to Ge(111) and within a wavelength range form 0.4 {\AA} to 1.6 {\AA}.Results using a mosaic Be crystal within the same wavelength range depend in this work on a model of the mosaicity of the Be crystal. However, if the reflectivity of the Be crystal is determined experimentally for a few selected wavelengths, it is not necessary to invoke a mosaic model and a Be crystal may serve the purpose of characterizing the synchrotron beam as well as a perfect crystal.Thin diamond and beryllium crystals in transmission are particularly convenient for spectroscopy of very powerful beams from third generation synchrotron sources, because these low-Z elements absorb only a tiny fraction of the beam power.",

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author = "Als-Nielsen, {Jens Aage} and K. Kj{\ae}r",

year = "1992",

doi = "10.1016/0168-9002(92)90015-V",

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volume = "323",

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T1 - Crystal spectroscopy of x-ray synchrotron source brightness

AU - Als-Nielsen, Jens Aage

AU - Kjær, K.

PY - 1992

Y1 - 1992

N2 - Photon intensities in a monochromatic beam obtained by a horizontal Bragg reflection of synchrotron radiation by a monochromator crystal are compared for the three perfect crystals: silicon and germanium in symmetric (111) reflection and Diamond (C∗) in asymmetric (111) transmission geometry. Consistent results are obtained within relative bandwidths spanning a factor of 50 from Si(333) to Ge(111) and within a wavelength range form 0.4 Å to 1.6 Å.Results using a mosaic Be crystal within the same wavelength range depend in this work on a model of the mosaicity of the Be crystal. However, if the reflectivity of the Be crystal is determined experimentally for a few selected wavelengths, it is not necessary to invoke a mosaic model and a Be crystal may serve the purpose of characterizing the synchrotron beam as well as a perfect crystal.Thin diamond and beryllium crystals in transmission are particularly convenient for spectroscopy of very powerful beams from third generation synchrotron sources, because these low-Z elements absorb only a tiny fraction of the beam power.

AB - Photon intensities in a monochromatic beam obtained by a horizontal Bragg reflection of synchrotron radiation by a monochromator crystal are compared for the three perfect crystals: silicon and germanium in symmetric (111) reflection and Diamond (C∗) in asymmetric (111) transmission geometry. Consistent results are obtained within relative bandwidths spanning a factor of 50 from Si(333) to Ge(111) and within a wavelength range form 0.4 Å to 1.6 Å.Results using a mosaic Be crystal within the same wavelength range depend in this work on a model of the mosaicity of the Be crystal. However, if the reflectivity of the Be crystal is determined experimentally for a few selected wavelengths, it is not necessary to invoke a mosaic model and a Be crystal may serve the purpose of characterizing the synchrotron beam as well as a perfect crystal.Thin diamond and beryllium crystals in transmission are particularly convenient for spectroscopy of very powerful beams from third generation synchrotron sources, because these low-Z elements absorb only a tiny fraction of the beam power.

KW - Materialers atomare struktur og egenskaber

U2 - 10.1016/0168-9002(92)90015-V

DO - 10.1016/0168-9002(92)90015-V

M3 - Journal article

SN - 0168-9002

VL - 323

SP - 686

EP - 693

JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

IS - 3

ER -

Crystal spectroscopy of x-ray synchrotron source brightness

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