scholarly journals A middle energy-bandwidth X-ray monochromator for high-flux synchrotron diffraction: revisiting asymmetrically cut silicon crystals

2019 ◽  
Vol 26 (3) ◽  
pp. 750-755 ◽  
Author(s):  
Hiroo Tajiri ◽  
Hiroshi Yamazaki ◽  
Haruhiko Ohashi ◽  
Shunji Goto ◽  
Osami Sakata ◽  
...  
Keyword(s):  
Atomic Plane ◽  
Photon Flux ◽  
Wide Energy Range ◽  
Double Crystal ◽  
X Ray ◽  
Silicon Crystals ◽  
Double Crystal Monochromator ◽  
Diffraction Geometry ◽  
Wide Energy ◽  
Surface Diffraction

To supply the growing demand for high photon flux in synchrotron science including surface diffraction, a middle energy-bandwidth monochromator covering the 10−4 to 10−3 range has been adapted by applying an asymmetric diffraction geometry to a cryogenically cooled silicon 111 double-crystal monochromator used as a standard for the undulator source at SPring-8. The asymmetric geometry provides a great advantage with its ability to configure flux gains over a wide energy range by simply changing the asymmetry angle, while the angular divergence of the exit beam remains unchanged. A monolithic design with three faces has been employed, having one symmetrically cut and another two asymmetrically cut surfaces relative to the same atomic plane, maintaining cooling efficiency and the capability of quickly changing the reflection surface. With the asymmetric geometry, an X-ray flux greater than 1014 photons s−1 was available around 12 keV. A maximum gain of 2.5 was obtained relative to the standard symmetric condition.

Kyushu University Beamline, BL06, at SAGA Light Source

2011 ◽  
Vol 1 (SRMS-7) ◽  
Author(s):  
S. Yoshioka ◽  
T. Ishioka ◽  
H. Okabe ◽  
A. Harata ◽  
Y. Sejima ◽  
...  
Keyword(s):  
Light Source ◽  
Focal Point ◽  
Fluorescence Yield ◽  
Photon Flux ◽  
Focal Distance ◽  
Double Crystal ◽  
X Ray ◽  
Xafs Spectroscopy ◽  
Ion Chamber ◽  
Double Crystal Monochromator

Kyushu University has installed the hard X-ray beamline, BL06, at bending magnet source of SAGA Light Source in Japan. It is designed for X-ray absorption fine structure (XAFS) spectroscopy and small-angle X-ray scattering (SAXS) experiments. The X-ray energy covered by the beamline ranges from 2.1 to 23 keV using a Si(111) flat double-crystal monochromator. Two bent cylindrical-type focusing mirrors are used, each with a different focal point. They are set in the optics section and can be used independently. One of the mirrors has a focal distance of 6 m, which corresponds to the sample stage for XAFS experiments, while the second mirror focuses at 10 m, corresponding to the detector for the SAXS experiments. The photon flux measured by the ion chamber at mirror focal point is 1010 phs/s. The experimental hutch houses the detection equipment for both XAFS and SAXS. For XAFS studies, a set of ion chambers for transmission mode and a Lytle detector and a Si drift detector for fluorescence yield mode are available. For SAXS studies, the camera pass length can be chosen from 0.5 to 2.5 m with 0.5 m increments in between, and an image plate is operated as signal detector. The beamline will be opened for user operation around summer 2010.

scholarly journals The New Beamline LISA at ESRF: Performances and Perspectives for Earth and Environmental Sciences

2019 ◽  
Vol 4 (1) ◽  
pp. 12 ◽  
Author(s):  
Alessandro Puri ◽  
Giovanni Lepore ◽  
Francesco d’Acapito
Keyword(s):  
European Synchrotron Radiation Facility ◽  
Small Sample ◽  
Photon Flux ◽  
Wide Energy Range ◽  
X Ray ◽  
Chemical Treatments ◽  
Wide Energy ◽  
X Ray Absorption ◽  
Raggi X

LISA (Linea Italiana per la Spettroscopia di Assorbimento di raggi X) is the new Italian Collaborating Research Group (CRG) beamline at the European Synchrotron Radiation Facility (ESRF) dedicated to X-ray absorption spectroscopy (XAS). The beamline covers a wide energy range, 4 < E < 90 keV, which offers the possibility for probe the K and L edges of elements that are heavier than Ca. A liquid He/N2 cryostat and a compact furnace are available for measurements in a wide temperature range (10–1000 K), allowing for in situ chemical treatments and measurements under a controlled atmosphere. The sub-millimetric beam size, the high photon flux provided, and the X-ray fluorescence detectors available (HP-Ge, SDD) allow for the study of liquid and highly diluted samples. Trace elements in geological or environmental samples can be analyzed, even for very small sample areas, gaining information on oxidation states and host phases.

Performance of the YB66 soft X-ray monochromator crystal at the wiggler beamline of the UVSOR facility

1998 ◽  
Vol 5 (3) ◽  
pp. 726-728 ◽  
Author(s):  
Toyohiko Kinoshita ◽  
Yasutaka Takata ◽  
Tokuo Matsukawa ◽  
Hirofumi Aritani ◽  
Shigehiro Matsuo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Synchrotron Radiation ◽  
Energy Resolution ◽  
Energy Region ◽  
Heat Load ◽  
Photon Flux ◽  
Double Crystal ◽  
X Ray ◽  
Double Crystal Monochromator ◽  
Monochromator Crystal

Soft X-ray spectra have been measured using a pair of YB66(400) monochromator crystals at the double-crystal monochromator beamline BL7A of the UVSOR facility, where the wiggler radiation has a magnetic field of 4 T. Deformation of the YB66 crystal due to heat load from the synchrotron radiation is almost negligible. The photon flux is about 108 photons s−1 (100 mA)−1 in the energy region 1.2–2 keV and the energy resolution is 0.7 ± 0.1 eV around hν = 1.5 keV. These results show that the YB66 crystal is suitable for use as a monochromator crystal. Its application to soft X-ray spectroscopy is discussed.

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

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

Design of an ultrahigh-energy-resolution and wide-energy-range soft X-ray beamline

2013 ◽  
Vol 21 (1) ◽  
pp. 273-279 ◽  
Author(s):  
L. Xue ◽  
R. Reininger ◽  
Y.-Q. Wu ◽  
Y. Zou ◽  
Z.-M. Xu ◽  
...  
Keyword(s):  
Energy Range ◽  
Energy Resolution ◽  
Wide Energy Range ◽  
Ultrahigh Energy ◽  
Exit Slit ◽  
Shanghai Synchrotron Radiation Facility ◽  
X Ray ◽  
Variable Line ◽  
Line Spacing ◽  
Wide Energy

A new ultrahigh-energy-resolution and wide-energy-range soft X-ray beamline has been designed and is under construction at the Shanghai Synchrotron Radiation Facility. The beamline has two branches: one dedicated to angle-resolved photoemission spectroscopy (ARPES) and the other to photoelectron emission microscopy (PEEM). The two branches share the same plane-grating monochromator, which is equipped with four variable-line-spacing gratings and covers the 20–2000 eV energy range. Two elliptically polarized undulators are employed to provide photons with variable polarization, linear in every inclination and circular. The expected energy resolution is approximately 10 meV at 1000 eV with a flux of more than 3 × 1010 photons s−1at the ARPES sample positions. The refocusing of both branches is based on Kirkpatrick–Baez pairs. The expected spot sizes when using a 10 µm exit slit are 15 µm × 5 µm (horizontal × vertical FWHM) at the ARPES station and 10 µm × 5 µm (horizontal × vertical FWHM) at the PEEM station. The use of plane optical elements upstream of the exit slit, a variable-line-spacing grating and a pre-mirror in the monochromator that allows the influence of the thermal deformation to be eliminated are essential for achieving the ultrahigh-energy resolution.

XAFS and X-MCD spectroscopies with undulator gap scan

1998 ◽  
Vol 5 (3) ◽  
pp. 989-991 ◽  
Author(s):  
Andrei Rogalev ◽  
Vincent Gotte ◽  
Jose´ Goulon ◽  
Christophe Gauthier ◽  
Joel Chavanne ◽  
...  
Keyword(s):  
Energy Range ◽  
Absorption Spectroscopy ◽  
Emission Peak ◽  
Photon Statistics ◽  
Wide Energy Range ◽  
X Ray ◽  
Polarization Rate ◽  
Spin Polarized ◽  
Wide Energy ◽  
X Ray Absorption

The first experimental applications of the undulator gap-scan technique in X-ray absorption spectroscopy are reported. The key advantage of this method is that during EXAFS scans the undulator is permanently tuned to the maximum of its emission peak in order to maximize the photon statistics. In X-MCD or spin-polarized EXAFS studies with a helical undulator of the Helios type, the polarization rate can also be kept almost constant over a wide energy range.

An accurate theory of X-ray coplanar multiple SRMS diffractometry

2018 ◽  
Vol 74 (6) ◽  
pp. 673-680 ◽  
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.

ASCA Observations of White Dwarfs, Neutron Stars and Black Holes

1996 ◽  
Vol 165 ◽  
pp. 321-331
Author(s):  
H. Inoue
Keyword(s):  
Black Holes ◽  
Focal Plane ◽  
Thin Foil ◽  
Effective Area ◽  
Wide Energy Range ◽  
Ccd Cameras ◽  
X Ray ◽  
Different Types ◽  
Wide Energy ◽  
Large Effective Area

ASCA, the fourth Japanese X-ray astronomy satellite, was launched by the Institute of Space and Astronautical Science (ISAS) on 1993 February 20. ASCA is designed to be a high-capability X-ray observatory (Tanaka et al. 1994). It is equipped with nested thin-foil mirrors which provide a large effective area over a wide energy range from 0.5 to 10 keV. Two different types of detectors, CCD cameras (SIS) and imaging gas scintillation proportional counters (GIS) are employed as the focal plane instruments.

A low-cost and flexible double-crystal monochromator for an x-ray beamline

1998 ◽  
Vol 69 (3) ◽  
pp. 1230-1235 ◽  
Author(s):  
C. S. Hwang ◽  
F. Y. Lin ◽  
Chih-Hao Lee ◽  
Kuan-Li Yu ◽  
C. H. Hsieh ◽  
...  
Keyword(s):  
Low Cost ◽  
Double Crystal ◽  
X Ray ◽  
Double Crystal Monochromator

A double crystal monochromator with self-compensation mechanism for ELETTRA XRD2 beamline

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
A. Gambitta
Keyword(s):  
Vertical Displacement ◽  
Compensation Mechanism ◽  
Input Beam ◽  
Output Beam ◽  
Double Crystal ◽  
X Ray ◽  
New Device ◽  
Double Crystal Monochromator ◽  
Fixed Distance

A prototype of a new double crystal monochromator (DCM) has been designed and developed for the second crystallography beamline (XRD2) at ELETTRA. The new device has to cover the 8–35 keV X-ray range. Since the corresponding diffraction angles are quite small, the choice has been to design a DCM with a fixed distance between the two crystals. As a consequence, the output beam has a small vertical displacement during the scan. This movement is compensated by means of an upstream mask, vertically moving and cutting the input beam at different heights. The movement of the mask is driven by a mechanism linked to the primary rotation of crystals (self-compensation), without any additional motor and following the displacement law required for compensation. The principle, the mechanism and the general mechanical concept of the device will be described in this paper.

Sign in / Sign up

Export Citation Format

Share Document