Spatial imaging of monochromatic hard x‐rays from an APS undulator by the Kohzu double‐crystal monochromator (abstract)

The rotated-inclined double-crystal monochromator (RIDCM) has been adopted to reduce the heat load from third-generation undulator radiation. The position of the exit X-rays from RIDCM has been calculated as a function of X-ray energy on the basis of diffraction theory including refraction effects. The results show that the positions of the exit X-rays vary over a wide range due to asymmetric reflection. Methods of fixing the exit position in RIDCM are also discussed.

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Micro X-Ray Fluorescence Analysis with Synchrotron Radiation

Advances in X-ray Analysis ◽

10.1154/s0376030800020401 ◽

1988 ◽

Vol 32 ◽

pp. 141-147

Author(s):

Shinjiro Hayakawa ◽

Atsuo Iida ◽

Sadao Aoki ◽

Yohichi Gohshi

Keyword(s):

Synchrotron Radiation ◽

Fluorescence Analysis ◽

X Rays ◽

Beam Spot ◽

Double Crystal ◽

X Ray ◽

Double Crystal Monochromator ◽

Surface Irregularities ◽

Sufficient Intensity ◽

Beam Excitation

AbstractA synchrotron radiation X-ray micro analyzer(SRXMA) was developed at Photon Factory in Japan. The present SRXMA combines a double crystal monochromator and mirror optics and either a white or a monochromatic microbeam can be used. Micro X-ray fluorescence analysis was carried out, and a minimum detection limit of 1 ppm for Mn was obtained for 100 sec measurement with the white beam. With monochromatic beam excitation, micro X-ray spectroscopies are now feasible.The obtained beam size was 1.6 μ;m - 34 μm* The beam was blurred in one direction by the scattered X-rays caused by the surface irregularities of the focusing mirror. Improvements in the mirror quality will ensure a beam spot of just a few microns with sufficient intensity.

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In Situ Gas Supply System on the Powder Diffraction Beamline I11 at Diamond Light Source

Materials Science Forum ◽

10.4028/www.scientific.net/msf.706-709.1707 ◽

2012 ◽

Vol 706-709 ◽

pp. 1707-1712 ◽

Cited By ~ 17

Author(s):

J.E. Parker ◽

J. Potter ◽

S.P. Thompson ◽

A.R. Lennie ◽

C.C. Tang

Keyword(s):

Powder Diffraction ◽

High Pressures ◽

High Angular Resolution ◽

X Rays ◽

Double Crystal ◽

Time Resolved ◽

Double Crystal Monochromator ◽

Harmonic Rejection ◽

Capillary Sample

Beamline I11 at Diamond began accepting users for high resolution powder diffraction experiments in Oct 2008. We present the design, key specifications, performance and the hardware of this new beamline which receives an intense and highly collimated x-ray beam generated by an in-vacuum undulator. With the simple optics (a double-crystal monochromator, harmonic rejection mirrors and slits), a high purity beam of low energy-bandpass X-rays optimised at 15 keV is delivered at the sample. The heavy duty diffraction instrument is designed to have the flexibility to house a variety of sample environments and holds two detection systems to collect high quality diffraction data, i.e. multi-analysing crystals (MAC) for high angular resolution experiments and a fast position sensitive detector (PSD) for time-resolved studies. A recent addition to the beamline capabilities is the installation of a specifically designed gas control system. This allows the in-situ dosing of a powder sample with gases such as hydrogen and carbon dioxide, at low (~10 mbar) and high pressures (<100 bar). In addition a low pressure capillary sample cell is described which is now available to users of the beamline.

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A DOUBLE CRYSTAL MONOCHROMATOR FOR SOFT X-RAY BEAM LINE OF UVSOR

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1986824 ◽

1986 ◽

Vol 47 (C8) ◽

pp. C8-135-C8-137

Author(s):

T. MURATA ◽

T. MATSUKAWA ◽

M. MORI ◽

M. OBASHI ◽

S.-I. NAO-E ◽

...

Keyword(s):

Beam Line ◽

Double Crystal ◽

X Ray ◽

Double Crystal Monochromator

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Optimization of a double crystal monochromator

Journal of the Korean Physical Society ◽

10.1007/s40042-021-00294-w ◽

2021 ◽

Author(s):

Zheng Jiang ◽

Eryan Wang ◽

Ruiqiang Song ◽

Siming Guo ◽

Jinjie Wu ◽

...

Keyword(s):

Double Crystal ◽

Double Crystal Monochromator

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Vibration measurements of high-heat-load monochromators for DESY PETRA III extension

Journal of Synchrotron Radiation ◽

10.1107/s1600577515005664 ◽

2015 ◽

Vol 22 (4) ◽

pp. 879-885 ◽

Cited By ~ 9

Author(s):

Paw Kristiansen ◽

Jan Horbach ◽

Ralph Döhrmann ◽

Joachim Heuer

Keyword(s):

Measurement Techniques ◽

High Heat ◽

Direct Drive ◽

Double Crystal ◽

Relative Pitch ◽

Double Crystal Monochromator ◽

Synchrotron Beam ◽

High Heat Load ◽

Low Emittance

The requirement for vibrational stability of beamline optics continues to evolve rapidly to comply with the demands created by the improved brilliance of the third-generation low-emittance storage rings around the world. The challenge is to quantify the performance of the instrument before it is installed at the beamline. In this article, measurement techniques are presented that directly and accurately measure (i) the relative vibration between the two crystals of a double-crystal monochromator (DCM) and (ii) the absolute vibration of the second-crystal cage of a DCM. Excluding a synchrotron beam, the measurements are conducted underin situconditions, connected to a liquid-nitrogen cryocooler. The investigated DCM utilizes a direct-drive (no gearing) goniometer for the Bragg rotation. The main causes of the DCM vibration are found to be the servoing of the direct-drive goniometer and the flexibility in the crystal cage motion stages. It is found that the investigated DCM can offer relative pitch vibration down to 48 nrad RMS (capacitive sensors, 0–5 kHz bandwidth) and absolute pitch vibration down to 82 nrad RMS (laser interferometer, 0–50 kHz bandwidth), with the Bragg axis brake engaged.

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Double-crystal diffraction imaging with a small effective divergence source: application to the magneto-acoustic vibrations in FeBO3

Journal of Applied Crystallography ◽

10.1107/s0021889800004222 ◽

2000 ◽

Vol 33 (4) ◽

pp. 1051-1058

Author(s):

Ioanna Matsouli ◽

Vladimir V. Kvardakov ◽

José Baruchel

Keyword(s):

Synchrotron Radiation ◽

Spatial Dispersion ◽

Angular Size ◽

Standing Waves ◽

Bragg Diffraction ◽

Elastic Coupling ◽

Acoustic Vibrations ◽

Double Crystal ◽

Double Crystal Monochromator ◽

Diffraction Imaging

Ultrasonic standing waves, excited in FeBO3(111) crystal plates through magneto-elastic coupling, were visualized using monochromatic Bragg diffraction imaging (topography) with synchrotron radiation. The images depend strongly on whether diffraction by the sample occurs in the same plane as in the double-crystal monochromator, or in the perpendicular plane. The observations are explained by taking into account (a) the strong spatial dispersion which prevails because of the small effective divergence (angular size of the source as seen from a point in the specimen), which is less than one microradian in this experiment, and (b) the sample vibration and curvature.

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An accurate theory of X-ray coplanar multiple SRMS diffractometry

Acta Crystallographica Section A Foundations and Advances ◽

10.1107/s2053273318012615 ◽

2018 ◽

Vol 74 (6) ◽

pp. 673-680 ◽

Cited By ~ 1

Author(s):

V. G. Kohn

Keyword(s):

Synchrotron Radiation ◽

Plane Wave ◽

Experimental Setup ◽

Incident Plane Wave ◽

Instrumental Function ◽

Multiple Diffraction ◽

Double Crystal ◽

X Ray ◽

Double Crystal Monochromator ◽

Incident Plane

The article reports an accurate theory of X-ray coplanar multiple diffraction for an experimental setup that consists of a generic synchrotron radiation (SR) source, double-crystal monochromator (M) and slit (S). It is called for brevity the theory of X-ray coplanar multiple SRMS diffractometry. The theory takes into account the properties of synchrotron radiation as well as the features of diffraction of radiation in the monochromator crystals and the slit. It is shown that the angular and energy dependence (AED) of the sample reflectivity registered by a detector has the form of a convolution of the AED in the case of the monochromatic plane wave with the instrumental function which describes the angular and energy spectrum of radiation incident on the sample crystal. It is shown that such a scheme allows one to measure the rocking curves close to the case of the monochromatic incident plane wave, but only using the high-order reflections by monochromator crystals. The case of four-beam (220)(331)({\overline {11}}1) diffraction in Si is considered in detail.

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