MEDSI2018 - List of Keywords (simulation)

Paper	Title	Other Keywords	Page
TUPH18	Vacuum Performance Test of CuCrZr Photon Absorbers	vacuum, experiment, storage-ring, synchrotron	66
	Q. Li, D.Z. Guo, P. He, B.Q. Liu, Y. Ma, T.Z. Qi, X.J. Wang IHEP, Beijing, People's Republic of China E. Maccallini, P. Manini SAES Getters S.p.A., Lainate, Italy
	To test the pumping performance of NEG coated Cu-CrZr absorber, we performed a comparative experiment on the two absorbers, one with NGE coating and the other one without coating. First, we run the Monte Carlo simu-lation by using MolFlow+ code to estimate the pressure inside test chamber at different thermal outgassing rate. And then two absorbers are mounted inside the chamber for the pressure vs. time profiles testing. The experimental set-up and pressure profiles will be presented here.
	Poster TUPH18 [0.852 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH18
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPH21	Design of Vertical and Horizontal Linear Flexure Stages for Beam Size Monitor System	radiation, synchrotron-radiation, synchrotron, emittance	72
	W.Y. Lai, H.C. Ho, K.H. Hsu, D.-G. Huang, C.K. Kuan, C.J. Lin, S.Y. Perng, T.C. Tseng, H.S. Wang NSRRC, Hsinchu, Taiwan
	Taiwan photon source is a third generation accelerator with low emittance and high brightness. The electric beam size is one of important parameters to indicate the stabil-ity and to measure the emittance and coupling of light source. The aperture size of beam slitter is a crucial part to calculate the value of beam size in the X-ray pine-hole system. In order to obtain the more precise result of beam size, the flexure mechanism on beam slitter is applied for the adjustment of the aperture. This paper shows that the design concept and the measurement of the beam size are obtained by the new adjustment system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH21
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOAMA02	Sample Stabilization for Tomography Experiments in Presence of Large Plant Uncertainty	controls, experiment, SRF, feedback	153
	T. Dehaeze, C.G.R.L. Collette PML, Liège, Belgium C.G.R.L. Collette ULB - FSA - SMN, Bruxelles, Belgium T. Dehaeze, M. Magnin-Mattenet ESRF, Grenoble, France
	A new low emittance lattice storage ring is under construction at the ESRF. In this new instrument, an upgraded end station for ID31 beamline must allow to position the samples along complex trajectories with a nanometer precision. In order to reach these requirements, samples have to be mounted on high precision stages, combining a capability of large stroke, spin motion, and active rejection of disturbances. First, the end station will be presented with the associated requirements. However, the precision is limited by thermal expansion and various imperfections that are not actively compensated. Our approach is to add a Nano Active Stabilization System (NASS) which is composed of a 6DoF Stewart platform and a 6 DoF metrology system. A 3D model of the end station updated with experimental data is developed. As the mass of the samples may vary by up to two orders of magnitudes, robust control strategies are required to address such plant uncertainty. The proposed control strategy are presented and applied on the developed model by conducting time domain simulations of tomography experiment in presence of instrumentation noise and system uncertainty.
	Slides WEOAMA02 [1.721 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOAMA02
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOAMA05	FE Model of a Nanopositioning Flexure Stage for Diagnosis of Trajectory Errors	experiment, photon, interface, laser	179
	S.P. Kearney, D. Shu ANL, Argonne, Illinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. The Advanced Photon Source Upgrade project includes upgrading several beamlines, which desire nanopositioning and fly-scan capabilities. A step towards achieving this is through the use of flexure stages with minimal trajectory errors. Typically, parasitic motion is on the order of micrometer-level displacements and tens of microradian-level rotations [1]. The cause of such errors is difficult to diagnosis due to the scale and complexity of the overall mechanism. Therefore, an FE model of a flexure pivot nanopositioning stage with centimeter-level travel range [1, 2] has been developed to aid in trajectory error diagnosis. Previous work used an FE model and relative error analysis to quantify the effects of assembly error on trajectory errors [3]. Relative error analysis was used due to the difficulty in validating a complex FE model. This study develops an experimentally validated FE model of a single joint to quantify the expected error in the full FE model. The full model is then compared experimentally to the flexure stage to assess the model accuracy and diagnosis trajectory errors. * D. Shu, et al. In Proc. SPIE, vol. 10371, 2017. U.S. Patent granted No. 8,957, 567, D. Shu, S. Kearney, and C. Preissner, 2015. * S. Kearney and D. Shu. In Proc. SPIE, vol. 10371, 2017.
	Slides WEOAMA05 [5.137 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOAMA05
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOPMA03	Application of Additive Manufacturing in the Development of a Sample Holder for a Fixed Target Vector Scanning Diffractometer at SwissFEL	site, acceleration, FEL, target	158
	X. Wang, P. Hirschi, J. Hora, H. Jöhri, B. Pedrini, C. Pradervand PSI, Villigen PSI, Switzerland
	Whilst the benefit of additive manufacturing (AM) in rapid prototyping becomes more and more established, the direct application of 3D printed part is still demanding. Exploitation of AM opens the door for complex and optimized parts which are otherwise impossible to fabricate. In the meanwhile, specific knowledge and aspects in analysis and design process are still to be explored. For a fixed target vector scanning diffractometer [1] at SwissFEL we developed, manufactured and tested a 3D-printed sample holder with carbon fiber reinforced plastics material. The diffractometer for serial crystallography is dedicated to collect diffraction patterns at up to 100 Hz on many small crystals (< 5 µm) by scanning the sample support in a continuous, arbitrary motion. The high dynamics arising from curved trajectories in the xy-plane requires a light and stiff sample holder which attaches the sample to the stage. In addition to 3D printed parts, an aluminum counterpart produced by CNC machining has also been tested and carefully evaluated. Our work in the course of development process on topology optimization, design, manufacturing and dynamic verification tests will be presented. [1] C. Pradervand et al., SwissMX: Fixed Target vector scanning diffractometer for Serial Crystallography at SwissFEL, SRI 2018
	Slides WEOPMA03 [6.670 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOPMA03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH01	Evaluation of Anisotropic Simulations & Redesign of the BXDS High Energy Monochromator Bent Laue Diffraction Crystal Holders	focusing, instrumentation, radiation, wiggler	199
	M.J.P. Adam, N. Appathurai CLS, Saskatoon, Saskatchewan, Canada
	The Brockhouse X-ray Diffraction and Scattering Sector (BXDS) High-Energy (HE) beamline includes a bent Laue diffraction monochromator. The BXDS HE monochromator achieves energy ranges of 35keV to 90 keV through the bent Laue diffraction of two silicon crystal wafers. Each wafer (460um & 1000um thick) is bent to achieve specific sagittal radius (Rs); subsequent anticlastic meridional radius (Rm) results from the anisotropic nature of silicon, creating the desired x-ray focusing parameters. During the initial conditioning of the BXDS HE monochromator spurious diffraction patterns were observed indicating that the crystal holder, and crystal integrity failed. Alternative holder designs were evaluated using Finite Element Analysis (FEA; ANSYS) simulations to ensure that appropriate Rs and Rm values were achieved, verification of the crystal holder Rs was completed using contact 3D measurement (FaroArm), and the crystal surface was assessed using 3D optical profiling (Zygo). A superior holder was chosen based on the results, and replaced. The performance of the BXDS HE monochromator has been characterized, indicating the new holder design has achieved x-ray focusing parameters.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH02	Thermomechanical Analysis of SESAME High-Heat-Load Front Ends Components	wiggler, radiation, synchrotron, dipole	202
	M.A. Al-Najdawi SESAME, Allan, Jordan
	New front end beamline components at SESAME* are designed to handle the high heat load produced by the insertion devices. A mini gap wiggler will be installed for the Material science Beamline and the front end will receive 5.0 kW of total power and 7.74 kW/mrad2 of peak power density. The power produced by the insertion device was simulated using SynRad+, this software is using Monte Carlo simulation to simulate the synchrotron radiation from either an insertion device or any magnet source, the surface power density distribution generated by this software mapped directly to an FEA software to conduct a coupled thermo-mechanical analsys. The design, modeling, power source simulation and FEA analysis of the fixed mask, shutter and filter for the material science Beamline front end will be presented in this paper Synchrotron-light for Experimental Science and Applications in the Middle East
	Poster WEPH02 [0.939 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH02
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH04	Finite Element Analysis of a Combined White Beam Filter and Visual Screen Using CVD Diamond for the BXDS Beamline	undulator, experiment, photon, storage-ring	208
	D.M. Smith, M.J.P. Adam, G.R. Barkway, A.J. Janis CLS, Saskatoon, Saskatchewan, Canada
	A white beam filter and visual screen are required for the undulator beamline at the Brockhouse X-Ray Diffraction and Scattering Sector. Reusing a water-cooled copper paddle with a 0.1 mm thick chemical vapor deposition (CVD) diamond foil, a combined filter and screen design is presented. The Canadian Light Source previously experienced failure of CVD diamond filters when exposed to high flux density white beam. Finite element analysis (FEA) was done to determine if the CVD diamond will fracture under the undulator heat load. Conservative failure criteria are selected for CVD diamond based on available literature for the following failure mechanisms: high temperature, thermal fatigue, and temperature induced stress. Four designs are analyzed using FEA models simulating effects of clamping pressure and heat load on the CVD diamond. The simulations are verified by optimizing the model mesh, comparing results against hand calculations, and comparing theoretical absorbed heat load to simulated values. Details of the modeling method are reviewed and results for the different designs evaluated. Suggestions for future testing of CVD diamond in a synchrotron setting will be discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH04
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH07	Photon Beam Applied as Heat Flux on Irregular Surfaces in FEA	photon, software, operation, radiation	214
	D. Capatina ANL, Argonne, Illinois, USA
	Funding: Work at the Advanced Photon Source is supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The light source front ends and beamlines contain several devices designed to limit the size of, or completely stop, the photon beam. Most of these devices are meant to protect personnel and/or equipment, thus their failure would have serious implications for the facility operation. The photon beam carries extremely high energy, thus the system will experience very large thermal loads. Accurate temperature and stress distribution of these components, based on well-reasoned assumptions, is needed to accurately review the performance of these devices during the design process. Applying nonuniform heat flux as a thermal load in simulation presents a challenge. This work describes the steps of the thermomechanical numerical simulation for a typical component at the Advanced Photon Source (APS), subject to photon beam interception. The numerical algorithm used to apply the nonuniform heat flux distribution on an irregular type of surface is presented in detail. The algorithm was developed using the commercial Finite Element Analysis (FEA) software ANSYS of ANSYS, Inc.
	Poster WEPH07 [0.636 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH07
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH12	Thermo-Mechanical Aspects of the MOBIPIX, a Compact X-Ray Imaging System with Embedded GPU	electron, detector, synchrotron, electronics	223
	A. Gilmour, W.R. Araujo, J.M. Polli LNLS, Campinas, Brazil
	Funding: The MOBIPIX project is part of Sirius project funded by the Brazilian Ministry of Science, Technology, Innovations and Communications. In the light of the high brilliance fourth generation syn-chrotron light sources, real-time imaging techniques be-came possible, boosting the demand for fast and reliable detectors. Mobipix project is a compact X-ray imaging camera based on Medipix3RX* ASIC designed for Sirius*. The control and acquisition system uses Sys-tem-On-a-Chip technology with embedded GPUs where data processing algorithms will run in real time. The Mobipix X-ray detector is de-signed to perform as a video camera, enabling X-ray imaging experiments and beam diagnose, at thousands of frames per second, without external computers. This paper presents the development of the Mobipix detector mechanics. The authors describe the path taken to design the structural aspects, ensuring robustness and versatility in the device installation to the beamlines, and the thermal aspects, regarding forced air cooling, high heat density, and small volume through which the flow will occur. The latter aspects were developed by exploiting CFD modelling. The Mobipix has 28 x 28 mm² active area, composed by 260k pixels of 55 x 55 'm2, and is planned to achieve continuous readout up to 2000 FPS. LNLS is a member of CERN Medipix3 Collaboration. https://medipix.web.cern.ch/collaboration/medipix3-collaboration ** Sirius is the new Brazilian Synchrotron Light Source under construction
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH12
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH31	Optimization Method Using Thermal and Mechanical Simulations for Sirius High-Stability Mirrors	cryogenics, synchrotron, radiation, photon	273
	L.M. Volpe, G.V. Claudiano, R.R. Geraldes, S.A.L. Luiz, A.C. Pinto LNLS, Campinas, Brazil
	Funding: Brazil's Ministry of Science, Technology, Innovation and Communication (MCTIC) The mirrors for Sirius, the new 4th-generation synchrotron at the Brazilian Synchrotron Light Laboratory (LNLS), have strict requirements regarding thermo-mechanical stability and deformations, with figure height and slope errors limited to a few nanometers and tens of nanoradians, respectively. Therefore, fixed-shape mirrors have been defined with horizontally-reflecting orientation (except for vertically-reflecting mirrors of KB systems), whereas their cooling schemes (namely, air, water or liquid nitrogen cooling) depend on the particular power load. A thermal and mechanical optimization method was developed to guide the design of mirrors through the evaluation of deformations caused by power load, cooling, gravity, tightening of the fastening screws, manufacturing errors and modal analyses. Up to now, this method was already used to define the mirrors of Sirius' beamlines, which include plane, cylindrical, elliptical and ellipsoidal mirrors, as well as KB systems for microprobe and nanoprobe stations. Two examples are presented to illustrate the method.
	Poster WEPH31 [1.296 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH31
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH39	Validation Results for Sirius APU19 Front End Prototype	vacuum, photon, MMI, undulator	290
	H.G.P. de Oliveira, L.C. Arruda, C.S.N.C. Bueno, H.F. Canova, P.T. Fonseca, G.L.M.P. Rodrigues, L. Sanfelici, L.M. Volpe LNLS, Campinas, Brazil
	Funding: Ministry of Science, Technology, Innovation and Communication (MCTIC) A Front End (FE) prototype for a 19-mm period length Adjustable Phase Undulator (APU19) beamline of the new Brazilian 4th-generation synchrotron, Sirius, was assembled in the LNLS metrology building in January 2017 to validate main design concepts. Regarding stability, flow-induced vibration (FIV) investigations were carried out on the water-cooled components, and modal analyses were made on the X-Ray Beam Position Monitor (XBPM) support. As for the vacuum system, final pressure levels were investigated and a vacuum breach was intentionally provoked to verify the performance of the equipment protection system (EPS). In addition, cycling tests of the Photon and Gamma shutters were conducted to verify the FE reliability. Moreover, the three-layer protection system, developed to limit the maximum aperture for the high-power slits, was functionally evaluated. Finally, the results were used to improve the FE to its final design. This paper describes the tests setups and results obtained during the validations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH39
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THOAMA03	Mechanical Engineering Design and Simulation for SPIRAL2 Accelerator @GANIL	target, linac, experiment, beam-transport	302
	C. Barthe-Dejean, M. Di Giacomo, P. Gangnant, P. Lecomte, J.F. Leyge, F. Lutton, C. Michel, M. Michel, E. Petit, R.V. Revenko, J.L. Vignet GANIL, Caen, France
	The SPIRAL2 project at GANIL is based on a superconducting ion continuous wave LINAC with two associated experimental areas named S3 (Super Separator Spectrometer) and NFS (Neutron For Science). This paper will report the main contributions of Mechanical Design Group at GANIL to the project. Mechanical engineers have been highly involved since 2005 from the pre-design of the accelerator and its development until present to finalize the installation. During the development phase, design and numerical simulation were used throughout the complete process: from the ion sources, to the LINAC accelerator, then through beam transport lines to experimental halls equipped with detectors. The entire installation (process, buildings and systems) is integrated in 3D CAD models. The paper focuses on three equipments designed in collaboration with electronics engineers and physicists : the Rebuncher in Mean Energy Beam Transport line; the Instrumentation Profiler SEM and the Target Chamber in S3. SPIRAL2 also has to meet safety requirements, such as seismic hazard, therefore the dynamic simulations performed to demonstrate the mechanical strength in case of earthquake will also be detailed.
	Slides THOAMA03 [5.836 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THOAMA04	Design and FEA of an Innovative Rotating Sic Filter for High-Energy X-Ray Beam	radiation, interface, storage-ring, scattering	306
	W. Tizzano, T. Connolley, S. Davies, M. Drakopoulos, G.E. Howell DLS, Oxfordshire, United Kingdom
	I12 is a high-energy imaging, diffraction and scattering beamline at Diamond. Its source is a superconducting wiggler with a power of approximately 9kW at 500 mA after the fixed front-end aperture; two permanent filters aim at reducing the power in photons below the operating range of the beamline of 50-150 keV, which accounts for about two-thirds of the total. This paper focuses on the design and simulation process of the secondary permanent filter, a 4mm thick SiC disk. The first version of the filter was vulnerable to cracking due to thermally induced stress, so a new filter based on an innovative concept was proposed: a water-cooled shaft rotates, via a ceramic interface, the SiC disk; the disk operates up to 900 degrees C, and a copper absorber surrounding the filter dissipates the heat through radiation. We utilised analysis data following failure of an initial prototype to successfully model the heat flow using FEA. This model informed different iterations of the re-design of the assembly, addressing the issues identified. The operational temperature of the final product matches within a few degrees C the one predicted by the simulation. M. Drakopoulos et al., "I12: the Joint Engineering, Environment and Processing (JEEP) beamline at Diamond Light Source".
	Slides THOAMA04 [6.381 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA04
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUPH18

Vacuum Performance Test of CuCrZr Photon Absorbers

vacuum, experiment, storage-ring, synchrotron

66

Q. Li, D.Z. Guo, P. He, B.Q. Liu, Y. Ma, T.Z. Qi, X.J. Wang
IHEP, Beijing, People's Republic of China
E. Maccallini, P. Manini
SAES Getters S.p.A., Lainate, Italy

To test the pumping performance of NEG coated Cu-CrZr absorber, we performed a comparative experiment on the two absorbers, one with NGE coating and the other one without coating. First, we run the Monte Carlo simu-lation by using MolFlow+ code to estimate the pressure inside test chamber at different thermal outgassing rate. And then two absorbers are mounted inside the chamber for the pressure vs. time profiles testing. The experimental set-up and pressure profiles will be presented here.

Poster TUPH18 [0.852 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH18

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPH21

Design of Vertical and Horizontal Linear Flexure Stages for Beam Size Monitor System

radiation, synchrotron-radiation, synchrotron, emittance

72

W.Y. Lai, H.C. Ho, K.H. Hsu, D.-G. Huang, C.K. Kuan, C.J. Lin, S.Y. Perng, T.C. Tseng, H.S. Wang
NSRRC, Hsinchu, Taiwan

Taiwan photon source is a third generation accelerator with low emittance and high brightness. The electric beam size is one of important parameters to indicate the stabil-ity and to measure the emittance and coupling of light source. The aperture size of beam slitter is a crucial part to calculate the value of beam size in the X-ray pine-hole system. In order to obtain the more precise result of beam size, the flexure mechanism on beam slitter is applied for the adjustment of the aperture. This paper shows that the design concept and the measurement of the beam size are obtained by the new adjustment system.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH21

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOAMA02

Sample Stabilization for Tomography Experiments in Presence of Large Plant Uncertainty

controls, experiment, SRF, feedback

153

T. Dehaeze, C.G.R.L. Collette
PML, Liège, Belgium
C.G.R.L. Collette
ULB - FSA - SMN, Bruxelles, Belgium
T. Dehaeze, M. Magnin-Mattenet
ESRF, Grenoble, France

A new low emittance lattice storage ring is under construction at the ESRF. In this new instrument, an upgraded end station for ID31 beamline must allow to position the samples along complex trajectories with a nanometer precision. In order to reach these requirements, samples have to be mounted on high precision stages, combining a capability of large stroke, spin motion, and active rejection of disturbances. First, the end station will be presented with the associated requirements. However, the precision is limited by thermal expansion and various imperfections that are not actively compensated. Our approach is to add a Nano Active Stabilization System (NASS) which is composed of a 6DoF Stewart platform and a 6 DoF metrology system. A 3D model of the end station updated with experimental data is developed. As the mass of the samples may vary by up to two orders of magnitudes, robust control strategies are required to address such plant uncertainty. The proposed control strategy are presented and applied on the developed model by conducting time domain simulations of tomography experiment in presence of instrumentation noise and system uncertainty.

Slides WEOAMA02 [1.721 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOAMA02

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOAMA05

FE Model of a Nanopositioning Flexure Stage for Diagnosis of Trajectory Errors

experiment, photon, interface, laser

179

S.P. Kearney, D. Shu
ANL, Argonne, Illinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
The Advanced Photon Source Upgrade project includes upgrading several beamlines, which desire nanopositioning and fly-scan capabilities. A step towards achieving this is through the use of flexure stages with minimal trajectory errors. Typically, parasitic motion is on the order of micrometer-level displacements and tens of microradian-level rotations [1]. The cause of such errors is difficult to diagnosis due to the scale and complexity of the overall mechanism. Therefore, an FE model of a flexure pivot nanopositioning stage with centimeter-level travel range [1, 2] has been developed to aid in trajectory error diagnosis. Previous work used an FE model and relative error analysis to quantify the effects of assembly error on trajectory errors [3]. Relative error analysis was used due to the difficulty in validating a complex FE model. This study develops an experimentally validated FE model of a single joint to quantify the expected error in the full FE model. The full model is then compared experimentally to the flexure stage to assess the model accuracy and diagnosis trajectory errors.
* D. Shu, et al. In Proc. SPIE, vol. 10371, 2017.
** U.S. Patent granted No. 8,957, 567, D. Shu, S. Kearney, and C. Preissner, 2015.
*** S. Kearney and D. Shu. In Proc. SPIE, vol. 10371, 2017.

Slides WEOAMA05 [5.137 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOAMA05

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOPMA03

Application of Additive Manufacturing in the Development of a Sample Holder for a Fixed Target Vector Scanning Diffractometer at SwissFEL

site, acceleration, FEL, target

158

X. Wang, P. Hirschi, J. Hora, H. Jöhri, B. Pedrini, C. Pradervand
PSI, Villigen PSI, Switzerland

Whilst the benefit of additive manufacturing (AM) in rapid prototyping becomes more and more established, the direct application of 3D printed part is still demanding. Exploitation of AM opens the door for complex and optimized parts which are otherwise impossible to fabricate. In the meanwhile, specific knowledge and aspects in analysis and design process are still to be explored. For a fixed target vector scanning diffractometer [1] at SwissFEL we developed, manufactured and tested a 3D-printed sample holder with carbon fiber reinforced plastics material. The diffractometer for serial crystallography is dedicated to collect diffraction patterns at up to 100 Hz on many small crystals (< 5 µm) by scanning the sample support in a continuous, arbitrary motion. The high dynamics arising from curved trajectories in the xy-plane requires a light and stiff sample holder which attaches the sample to the stage. In addition to 3D printed parts, an aluminum counterpart produced by CNC machining has also been tested and carefully evaluated. Our work in the course of development process on topology optimization, design, manufacturing and dynamic verification tests will be presented.
[1] C. Pradervand et al., SwissMX: Fixed Target vector scanning diffractometer for Serial Crystallography at SwissFEL, SRI 2018

Slides WEOPMA03 [6.670 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOPMA03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH01

Evaluation of Anisotropic Simulations & Redesign of the BXDS High Energy Monochromator Bent Laue Diffraction Crystal Holders

focusing, instrumentation, radiation, wiggler

199

M.J.P. Adam, N. Appathurai
CLS, Saskatoon, Saskatchewan, Canada

The Brockhouse X-ray Diffraction and Scattering Sector (BXDS) High-Energy (HE) beamline includes a bent Laue diffraction monochromator. The BXDS HE monochromator achieves energy ranges of 35keV to 90 keV through the bent Laue diffraction of two silicon crystal wafers. Each wafer (460um & 1000um thick) is bent to achieve specific sagittal radius (Rs); subsequent anticlastic meridional radius (Rm) results from the anisotropic nature of silicon, creating the desired x-ray focusing parameters. During the initial conditioning of the BXDS HE monochromator spurious diffraction patterns were observed indicating that the crystal holder, and crystal integrity failed. Alternative holder designs were evaluated using Finite Element Analysis (FEA; ANSYS) simulations to ensure that appropriate Rs and Rm values were achieved, verification of the crystal holder Rs was completed using contact 3D measurement (FaroArm), and the crystal surface was assessed using 3D optical profiling (Zygo). A superior holder was chosen based on the results, and replaced. The performance of the BXDS HE monochromator has been characterized, indicating the new holder design has achieved x-ray focusing parameters.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH02

Thermomechanical Analysis of SESAME High-Heat-Load Front Ends Components

wiggler, radiation, synchrotron, dipole

202

M.A. Al-Najdawi
SESAME, Allan, Jordan

New front end beamline components at SESAME* are designed to handle the high heat load produced by the insertion devices. A mini gap wiggler will be installed for the Material science Beamline and the front end will receive 5.0 kW of total power and 7.74 kW/mrad2 of peak power density. The power produced by the insertion device was simulated using SynRad+, this software is using Monte Carlo simulation to simulate the synchrotron radiation from either an insertion device or any magnet source, the surface power density distribution generated by this software mapped directly to an FEA software to conduct a coupled thermo-mechanical analsys. The design, modeling, power source simulation and FEA analysis of the fixed mask, shutter and filter for the material science Beamline front end will be presented in this paper
Synchrotron-light for Experimental Science and Applications in the Middle East

Poster WEPH02 [0.939 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH02

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH04

Finite Element Analysis of a Combined White Beam Filter and Visual Screen Using CVD Diamond for the BXDS Beamline

undulator, experiment, photon, storage-ring

208

D.M. Smith, M.J.P. Adam, G.R. Barkway, A.J. Janis
CLS, Saskatoon, Saskatchewan, Canada

A white beam filter and visual screen are required for the undulator beamline at the Brockhouse X-Ray Diffraction and Scattering Sector. Reusing a water-cooled copper paddle with a 0.1 mm thick chemical vapor deposition (CVD) diamond foil, a combined filter and screen design is presented. The Canadian Light Source previously experienced failure of CVD diamond filters when exposed to high flux density white beam. Finite element analysis (FEA) was done to determine if the CVD diamond will fracture under the undulator heat load. Conservative failure criteria are selected for CVD diamond based on available literature for the following failure mechanisms: high temperature, thermal fatigue, and temperature induced stress. Four designs are analyzed using FEA models simulating effects of clamping pressure and heat load on the CVD diamond. The simulations are verified by optimizing the model mesh, comparing results against hand calculations, and comparing theoretical absorbed heat load to simulated values. Details of the modeling method are reviewed and results for the different designs evaluated. Suggestions for future testing of CVD diamond in a synchrotron setting will be discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH04

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH07

Photon Beam Applied as Heat Flux on Irregular Surfaces in FEA

photon, software, operation, radiation

214

D. Capatina
ANL, Argonne, Illinois, USA

Funding: Work at the Advanced Photon Source is supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
The light source front ends and beamlines contain several devices designed to limit the size of, or completely stop, the photon beam. Most of these devices are meant to protect personnel and/or equipment, thus their failure would have serious implications for the facility operation. The photon beam carries extremely high energy, thus the system will experience very large thermal loads. Accurate temperature and stress distribution of these components, based on well-reasoned assumptions, is needed to accurately review the performance of these devices during the design process. Applying nonuniform heat flux as a thermal load in simulation presents a challenge. This work describes the steps of the thermomechanical numerical simulation for a typical component at the Advanced Photon Source (APS), subject to photon beam interception. The numerical algorithm used to apply the nonuniform heat flux distribution on an irregular type of surface is presented in detail. The algorithm was developed using the commercial Finite Element Analysis (FEA) software ANSYS of ANSYS, Inc.

Poster WEPH07 [0.636 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH07

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH12

Thermo-Mechanical Aspects of the MOBIPIX, a Compact X-Ray Imaging System with Embedded GPU

electron, detector, synchrotron, electronics

223

A. Gilmour, W.R. Araujo, J.M. Polli
LNLS, Campinas, Brazil

Funding: The MOBIPIX project is part of Sirius project funded by the Brazilian Ministry of Science, Technology, Innovations and Communications.
In the light of the high brilliance fourth generation syn-chrotron light sources, real-time imaging techniques be-came possible, boosting the demand for fast and reliable detectors. Mobipix project is a compact X-ray imaging camera based on Medipix3RX* ASIC designed for Sirius**. The control and acquisition system uses Sys-tem-On-a-Chip technology with embedded GPUs where data processing algorithms will run in real time. The Mobipix X-ray detector is de-signed to perform as a video camera, enabling X-ray imaging experiments and beam diagnose, at thousands of frames per second, without external computers. This paper presents the development of the Mobipix detector mechanics. The authors describe the path taken to design the structural aspects, ensuring robustness and versatility in the device installation to the beamlines, and the thermal aspects, regarding forced air cooling, high heat density, and small volume through which the flow will occur. The latter aspects were developed by exploiting CFD modelling. The Mobipix has 28 x 28 mm² active area, composed by 260k pixels of 55 x 55 'm2, and is planned to achieve continuous readout up to 2000 FPS.
* LNLS is a member of CERN Medipix3 Collaboration. https://medipix.web.cern.ch/collaboration/medipix3-collaboration
** Sirius is the new Brazilian Synchrotron Light Source under construction

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH12

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH31

Optimization Method Using Thermal and Mechanical Simulations for Sirius High-Stability Mirrors

cryogenics, synchrotron, radiation, photon

273

L.M. Volpe, G.V. Claudiano, R.R. Geraldes, S.A.L. Luiz, A.C. Pinto
LNLS, Campinas, Brazil

Funding: Brazil's Ministry of Science, Technology, Innovation and Communication (MCTIC)
The mirrors for Sirius, the new 4th-generation synchrotron at the Brazilian Synchrotron Light Laboratory (LNLS), have strict requirements regarding thermo-mechanical stability and deformations, with figure height and slope errors limited to a few nanometers and tens of nanoradians, respectively. Therefore, fixed-shape mirrors have been defined with horizontally-reflecting orientation (except for vertically-reflecting mirrors of KB systems), whereas their cooling schemes (namely, air, water or liquid nitrogen cooling) depend on the particular power load. A thermal and mechanical optimization method was developed to guide the design of mirrors through the evaluation of deformations caused by power load, cooling, gravity, tightening of the fastening screws, manufacturing errors and modal analyses. Up to now, this method was already used to define the mirrors of Sirius' beamlines, which include plane, cylindrical, elliptical and ellipsoidal mirrors, as well as KB systems for microprobe and nanoprobe stations. Two examples are presented to illustrate the method.

Poster WEPH31 [1.296 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH31

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPH39

Validation Results for Sirius APU19 Front End Prototype

vacuum, photon, MMI, undulator

290

H.G.P. de Oliveira, L.C. Arruda, C.S.N.C. Bueno, H.F. Canova, P.T. Fonseca, G.L.M.P. Rodrigues, L. Sanfelici, L.M. Volpe
LNLS, Campinas, Brazil

Funding: Ministry of Science, Technology, Innovation and Communication (MCTIC)
A Front End (FE) prototype for a 19-mm period length Adjustable Phase Undulator (APU19) beamline of the new Brazilian 4th-generation synchrotron, Sirius, was assembled in the LNLS metrology building in January 2017 to validate main design concepts. Regarding stability, flow-induced vibration (FIV) investigations were carried out on the water-cooled components, and modal analyses were made on the X-Ray Beam Position Monitor (XBPM) support. As for the vacuum system, final pressure levels were investigated and a vacuum breach was intentionally provoked to verify the performance of the equipment protection system (EPS). In addition, cycling tests of the Photon and Gamma shutters were conducted to verify the FE reliability. Moreover, the three-layer protection system, developed to limit the maximum aperture for the high-power slits, was functionally evaluated. Finally, the results were used to improve the FE to its final design. This paper describes the tests setups and results obtained during the validations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH39

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THOAMA03

Mechanical Engineering Design and Simulation for SPIRAL2 Accelerator @GANIL

target, linac, experiment, beam-transport

302

C. Barthe-Dejean, M. Di Giacomo, P. Gangnant, P. Lecomte, J.F. Leyge, F. Lutton, C. Michel, M. Michel, E. Petit, R.V. Revenko, J.L. Vignet
GANIL, Caen, France

The SPIRAL2 project at GANIL is based on a superconducting ion continuous wave LINAC with two associated experimental areas named S3 (Super Separator Spectrometer) and NFS (Neutron For Science). This paper will report the main contributions of Mechanical Design Group at GANIL to the project. Mechanical engineers have been highly involved since 2005 from the pre-design of the accelerator and its development until present to finalize the installation. During the development phase, design and numerical simulation were used throughout the complete process: from the ion sources, to the LINAC accelerator, then through beam transport lines to experimental halls equipped with detectors. The entire installation (process, buildings and systems) is integrated in 3D CAD models. The paper focuses on three equipments designed in collaboration with electronics engineers and physicists : the Rebuncher in Mean Energy Beam Transport line; the Instrumentation Profiler SEM and the Target Chamber in S3. SPIRAL2 also has to meet safety requirements, such as seismic hazard, therefore the dynamic simulations performed to demonstrate the mechanical strength in case of earthquake will also be detailed.

Slides THOAMA03 [5.836 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THOAMA04

Design and FEA of an Innovative Rotating Sic Filter for High-Energy X-Ray Beam

radiation, interface, storage-ring, scattering

306

W. Tizzano, T. Connolley, S. Davies, M. Drakopoulos, G.E. Howell
DLS, Oxfordshire, United Kingdom

I12 is a high-energy imaging, diffraction and scattering beamline at Diamond. Its source is a superconducting wiggler with a power of approximately 9kW at 500 mA after the fixed front-end aperture; two permanent filters aim at reducing the power in photons below the operating range of the beamline of 50-150 keV, which accounts for about two-thirds of the total*. This paper focuses on the design and simulation process of the secondary permanent filter, a 4mm thick SiC disk. The first version of the filter was vulnerable to cracking due to thermally induced stress, so a new filter based on an innovative concept was proposed: a water-cooled shaft rotates, via a ceramic interface, the SiC disk; the disk operates up to 900 degrees C, and a copper absorber surrounding the filter dissipates the heat through radiation. We utilised analysis data following failure of an initial prototype to successfully model the heat flow using FEA. This model informed different iterations of the re-design of the assembly, addressing the issues identified. The operational temperature of the final product matches within a few degrees C the one predicted by the simulation.
*M. Drakopoulos et al., "I12: the Joint Engineering, Environment and Processing (JEEP) beamline at Diamond Light Source".

Slides THOAMA04 [6.381 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA04

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)