Mechanical design and finite element analyses of surface bending mechanism for X-ray optics

2018 ◽  
Vol 53 ◽  
pp. 107-119 ◽  
Author(s):  
Xuepeng Gong ◽  
Qipeng Lu ◽  
Yi Wang ◽  
Yuan Song
Keyword(s):  
Finite Element ◽  
Mechanical Design ◽  
Finite Element Analyses ◽  
Ray Optics ◽  
X Ray ◽  
Bending Mechanism

scholarly journals A finite element approach to x-ray optics design

2017 ◽  
Author(s):  
A. P. Honkanen ◽  
C. Ferrero ◽  
J. P. Guigay ◽  
V. Mocella
Keyword(s):  
Finite Element ◽  
Ray Optics ◽  
Finite Element Approach ◽  
X Ray ◽  
Element Approach ◽  
Optics Design

Finite element modeling of a laminar flexure bending mechanism for elliptically bent hard x-ray mirror

2019 ◽  
Author(s):  
Jayson Anton ◽  
Deming Shu ◽  
Steven P. Kearney ◽  
Ross Harder ◽  
Xianbo Shi ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
X Ray ◽  
Element Modeling ◽  
Bending Mechanism

Design of a 2 T multipole wiggler insertion device for the SRS

1998 ◽  
Vol 5 (3) ◽  
pp. 434-436 ◽  
Author(s):  
James A. Clarke ◽  
Neil Bliss ◽  
David Bradshaw ◽  
Cheryl Dawson ◽  
Barry Fell ◽  
...  
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Engineering Design ◽  
Mechanical Design ◽  
High Flux ◽  
Support Structure ◽  
X Ray ◽  
Insertion Device

Two new identical insertion devices have been designed for the Daresbury SRS. They are 2 T permanent-magnet multipole wigglers that will provide high flux in the X-ray region. This paper describes the magnetic and mechanical design of the arrays of steel pole pieces and permanent-magnet blocks. Also given is the engineering design of the support structure that will cope with the very large forces present while maintaining high levels of precision in gap setting and parallelism. The engineering design has been fully assessed using finite-element techniques to predict the deflections of critical parts of the structure. These two devices are due to be installed into the SRS by the end of 1998.

Finite-element modelling of multilayer X-ray optics

2017 ◽  
Vol 24 (3) ◽  
pp. 717-724
Author(s):  
Xianchao Cheng ◽  
Lin Zhang
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Photon Flux ◽  
Attractive Alternative ◽  
Geometrical Parameters ◽  
X Rays ◽  
Element Analysis ◽  
Ray Optics ◽  
X Ray ◽  
Fea Model

Multilayer optical elements for hard X-rays are an attractive alternative to crystals whenever high photon flux and moderate energy resolution are required. Prediction of the temperature, strain and stress distribution in the multilayer optics is essential in designing the cooling scheme and optimizing geometrical parameters for multilayer optics. The finite-element analysis (FEA) model of the multilayer optics is a well established tool for doing so. Multilayers used in X-ray optics typically consist of hundreds of periods of two types of materials. The thickness of one period is a few nanometers. Most multilayers are coated on silicon substrates of typical size 60 mm × 60 mm × 100–300 mm. The high aspect ratio between the size of the optics and the thickness of the multilayer (107) can lead to a huge number of elements for the finite-element model. For instance, meshing by the size of the layers will require more than 1016 elements, which is an impossible task for present-day computers. Conversely, meshing by the size of the substrate will produce a too high element shape ratio (element geometry width/height > 106), which causes low solution accuracy; and the number of elements is still very large (106). In this work, by use of ANSYS layer-functioned elements, a thermal-structural FEA model has been implemented for multilayer X-ray optics. The possible number of layers that can be computed by presently available computers is increased considerably.

Bent-crystal monochromators for high-energy synchrotron radiation

1998 ◽  
Vol 5 (3) ◽  
pp. 699-701 ◽  
Author(s):  
Hitoshi Yamaoka ◽  
Tetsuro Mochizuki ◽  
Yoshiharu Sakurai ◽  
Hiroshi Kawata
Keyword(s):  
Finite Element ◽  
Synchrotron Radiation ◽  
Compton Scattering ◽  
Silicon Crystal ◽  
High Energy ◽  
Finite Element Analyses ◽  
X Ray ◽  
Bent Crystal ◽  
Dominant Process ◽  
Bent Crystals

Two kinds of monochromators covering the energy ranges 100–150 keV and ∼300 keV have been designed for inelastic (Compton) scattering experiments at the elliptical multipole wiggler beamline, BL08W, of SPring-8. Finite-element analyses using ANSYS for bent crystals indicate that thermal problems are not serious for the 300 keV monochromator, while an energy spread of about 10−3 for the 100–150 keV monochromator is possible in the centre of the crystal. Detailed calculations of X-ray interaction with the silicon crystal were performed. The results show that Compton scattering is a dominant process and deposits about 100 W continuously.

scholarly journals Damage mechanisms in elastomeric foam composites: Multiscale X-ray computed tomography and finite element analyses

2019 ◽  
Vol 169 ◽  
pp. 195-202 ◽  
Author(s):  
Brendan P. Croom ◽  
Helena Jin ◽  
Bernice Mills ◽  
Jay Carroll ◽  
Kevin Long ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Finite Element ◽  
Finite Element Analyses ◽  
Damage Mechanisms ◽  
X Ray ◽  
X Ray Computed

scholarly journals Simplified methods for designing thermo-active retaining walls

2020 ◽  
Vol 205 ◽  
pp. 06011 ◽  
Author(s):  
Eleonora Sailer ◽  
David M. G. Taborda ◽  
Lidija Zdravkovic ◽  
David M. Potts
Keyword(s):  
Finite Element ◽  
Heat Exchanger ◽  
Mechanical Response ◽  
Mechanical Design ◽  
Retaining Wall ◽  
Three Dimensional ◽  
Finite Element Analyses ◽  
Factors Affecting ◽  
Heating And Cooling

Thermo-active retaining structures are geotechnical structures employed to provide thermal energy to buildings for space heating and cooling through heat exchanger pipes embedded within the concrete structure. Consequently, the design of these structures needs to consider both the long-term energy efficiency as well as the thermo-mechanical response in terms of stability and serviceability. Transient finite element analyses can be carried out to evaluate the behaviour of thermo-active walls, where the heat exchanger pipes are explicitly modelled, thus requiring three-dimensional (3D) analyses. However, performing long-term 3D finite element analyses is computationally expensive. For this reason, in this study, new approaches are presented that allow the thermal or thermo-mechanical design of thermo-active walls to be carried out by performing two-dimensional (2D) plane strain analyses. Two methods, which are based on different design criteria, are proposed and their performance in replicating the three-dimensional behaviour is assessed. Furthermore, the factors affecting the 2D approximations for the two modelling approaches are evaluated, where particular emphasis is given to the influence of the simulated boundary condition along the exposed face of the retaining wall.

scholarly journals Mechanical design of thin-film diamond crystal mounting apparatus for coherence preservation hard x-ray optics

2016 ◽  
Author(s):  
Deming Shu ◽  
Yuri V. Shvyd’ko ◽  
Stanislav Stoupin ◽  
Kwang-Je Kim
Keyword(s):  
Thin Film ◽  
Diamond Crystal ◽  
Mechanical Design ◽  
Ray Optics ◽  
X Ray

X-ray microprobe for materials science

1994 ◽  
Vol 52 ◽  
pp. 56-57
Author(s):  
G.E. Ice
Keyword(s):  
Crystallographic Orientation ◽  
Local Structure ◽  
Materials Science ◽  
Chemical Information ◽  
X Ray Diffraction ◽  
Ray Optics ◽  
X Ray ◽  
Novel Materials ◽  
New Information ◽  
Elemental Sensitivity

The increasing availability of synchrotron x-ray sources has stimulated the development of advanced hard x-ray (E≥5 keV) microprobes. With new x-ray optics these microprobes can achieve micron and submicron spatial resolutions. The inherent elemental and crystallographic sensitivity of an x-ray microprobe and its inherently nondestructive and penetrating nature will have important applications to materials science. For example, x-ray fluorescent microanalysis of materials can reveal elemental distributions with greater sensitivity than alternative nondestructive probes. In materials, segregation and nonuniform distributions are the rule rather than the exception. Common interfaces to whichsegregation occurs are surfaces, grain and precipitate boundaries, dislocations, and surfaces formed by defects such as vacancy and interstitial configurations. In addition to chemical information, an x-ray diffraction microprobe can reveal the local structure of a material by detecting its phase, crystallographic orientation and strain.Demonstration experiments have already exploited the penetrating nature of an x-ray microprobe and its inherent elemental sensitivity to provide new information about elemental distributions in novel materials.

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