Welding of Silicon to Invar for Application in Synchrotron Light Instrumentation

2018 ◽  
Vol 389 ◽  
pp. 176-182 ◽  
Author(s):  
Mayara Maria Beltani Auricchio ◽  
Osmar Roberto Bagnato ◽  
Paulo Roberto Mei
Keyword(s):  
Mechanical Test ◽  
Copper Film ◽  
Microstructural Characterization ◽  
Fourth Generation ◽  
Metallographic Analysis ◽  
Double Crystal ◽  
Double Crystal Monochromator ◽  
Synchrotron Light ◽  
Nanosilver Paste ◽  
Welding Processes

The Double Crystal Monochromator (DCM) will be developed at the Brazilian Synchrotron Light Laboratory (LNLS) to select the desired X-Ray wavelength of Sirius, the new Brazilian fourth generation synchrotron. Components of this optical instrumentation can be obtained through welding processes, such as brazing, soldering, and diffusion bonding. The use of vacuum welding technique ensures union of silicon with FeNi alloy, Invar36 (64Fe-36Ni) from Grupo Metal and Invar39 (61Fe-39Fe) from Scientific Alloys. Union of these materials was performed with filler alloys from Nihon Superior, such as ALCONANO (nanosilver paste), SnSb (95Sn-5Sb), Sn100C (Sn-0.7Cu-0.05Ni-0.01Ge), and Sn100CV (Sn-5Bi-0.8Cu-0.05Ni). Following welding tests, microstructural and metallographic analysis of the interface region between the materials involved are performed to investigate the junction among silicon, filler alloy, and base metal. Microstructural characterization carried out by a QUANTA SEM (Scanning Electron Microscope) with EDS (Energy Dispersive Spectroscopy) technique to identify the composition, distribution, and morphology of the phases. Based on these analyses, the best parameters were Invar39/Sn100CV/Si samples using base materials coated with different depositions: one gold and the other copper. In the mechanical test, the specimen with copper film presented higher shear strength.

Soldering of silicon to Invar for double-crystal monochromators

2019 ◽  
Vol 26 (5) ◽  
pp. 1565-1571
Author(s):  
Mayara Maria Beltani Auricchio ◽  
Paulo Roberto Mei ◽  
Osmar Roberto Bagnato
Keyword(s):  
Copper Deposition ◽  
Fourth Generation ◽  
Gold Deposition ◽  
X Ray Diffraction ◽  
Double Crystal ◽  
Average Force ◽  
Base Materials ◽  
Quantitative Analyses ◽  
Synchrotron Light ◽  
Feni Alloy

At the Brazilian Synchrotron Light Laboratory (LNLS), new double-crystal monochromators are under development for use at the new Brazilian fourth-generation synchrotron, Sirius. The soldering technique used for the double-crystal monochromators ensures the union of monocrystalline silicon with FeNi alloy, Invar36 (64Fe–36Ni) from Grupo Metal and Invar39 (61Fe–39Fe) from Scientific Alloys, through SnSb (92.8Sn–7.2Sb), SnCu (Sn–0.3Cu) and SnBiCu (Sn–1.4Bi–0.7Cu) alloys from Nihon Superior. Following soldering tests and quantitative analysis, the Invar39/SnBiCu/Si samples were selected using base materials coated with different depositions – gold and copper. X-ray diffraction identified the formation of intermetallic compounds, such as AuSn2 and AuSn4 in base materials coated with gold and Cu3Sn and Cu6Sn5 with copper. Before thermal cycling, the average force obtained in shear tests was 1131 N with copper deposition and 499 N with gold deposition. After five consecutive thermal cycles from room temperature down to cryogenic temperature (−196.15°C), specimens with gold deposition presented cracks in the interface region and those with copper deposition showed no defects. Based on this, qualitative and semi-quantitative analyses of specimens with copper deposition were carried out by scanning electron microscopy and energy-dispersive spectroscopy techniques to identify the composition, distribution and morphology of the elements.

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

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

1996 ◽  
Vol 67 (9) ◽  
pp. 3348-3348
Author(s):  
D.M. Mills ◽  
W.K. Lee ◽  
M. Keeffe ◽  
D.R. Haeffner ◽  
P. Fernandez
Keyword(s):  
X Rays ◽  
Double Crystal ◽  
Double Crystal Monochromator

Optimization of a double crystal monochromator

2021 ◽  
Author(s):  
Zheng Jiang ◽  
Eryan Wang ◽  
Ruiqiang Song ◽  
Siming Guo ◽  
Jinjie Wu ◽  
...  
Keyword(s):  
Double Crystal ◽  
Double Crystal Monochromator

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

2015 ◽  
Vol 22 (4) ◽  
pp. 879-885 ◽  
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.

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

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.

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.

The Failure of Carbon Fiber Reinforced Composite Analyzed by Acoustic Emission

2020 ◽  
Vol 405 ◽  
pp. 205-211
Author(s):  
Vladimír Mára ◽  
Jan Krčil ◽  
Lenka Michalcová ◽  
Elena Čižmárová
Keyword(s):  
Acoustic Emission ◽  
Carbon Fiber ◽  
Mechanical Test ◽  
Metallographic Analysis ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Damage And Failure ◽  
Reinforced Composite ◽  
Carbon Fiber Reinforced ◽  
Damage Processes

This paper focus on evaluation of behavior, damage and failure processes occurring during the loading cycles in the carbon fiber reinforced composite by acoustic emission method. Since acoustic emission is physical phenomenon that detects the released energy in form of waves spreading through the material due to stimulation of material by external or internal stress, it is possible to evaluate complex damage and failure processes. For that purpose, the standard and open holes tensile testing specimens with different number of plies were manufactured. Selected acoustic emission parameters were correlated with data obtained from mechanical test. Linear localization method together with signal analysis using Fast Fourier transform algorithm were used as another tool for detection and evaluation of spreading damage processes inside the composite during the load. Basic damage types inside the composite material were identified by metallographic analysis using light microscopy. More complex damage processes were observed on the fracture surface using stereomicroscopy and scanning electron microscopy.

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.

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