MEDSI2018 - Classification: Simulation / Structural Statics And Dynamics

Paper	Title	Page
WEPH01	Evaluation of Anisotropic Simulations & Redesign of the BXDS High Energy Monochromator Bent Laue Diffraction Crystal Holders	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
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WEPH22	Le Guide for Support: A Cookbook for Modeling of Accelerator Structures*	252
	C.A. Preissner, S.J. Izzo, Z. Liu, J. Nudell ANL, Argonne, Illinois, USA
	Funding: * Argonne National Laboratory's work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract DE-AC02- 06CH11357. The Advanced Photon Source-Upgrade (APS-U) project has stringent specifications and a 12 month installation schedule. Some form of these constraints appear to be common at all multi-bend achromat upgrade projects. At the APS-U, no full tests will be made of the final accelerator support design. The evaluation of the final design against the specifications will be based primarily on computer simulations using virtual inputs. Insuring that the final designs meet specifications solely based on simulations is much like cooking a complex, multi-course meal without a trial run. Producing a successful meal on the first try requires a prior understanding of the ingre-dients, techniques, and interactions between the constituents. A good cookbook can be essential in providing this under-standing. Likewise, producing an accelerator support final design that meets the requirements requires a prior under-standing of the materials, components, techniques, and interactions between them. This poster describes a cookbook-style approach that any design team can use to confidently predict important characteristics such as natural frequency and ambient vibration response with an error of around 10%.
	Poster WEPH22 [0.541 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH22
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THOAMA01	Optimizing the PETRA IV Girder by Using Bio-Inspired Structures	297
	S. Andresen Alfred-Wegener-Institut, Bremerhaven, Germany
	The PETRA IV project at DESY (Deutsches Elektronen Synchrotron) aims at building a unique synchrotron light source to provide beams of hard X-rays with unprecedented coherence properties that can be focused to dimensions in the nanometer-regime. An optimization of the girder structure is necessary to reduce the impact of ambient vibrations on the particle beam. For this purpose, several numerical approaches have been made to simultaneously reach natural frequencies above 50 Hz, a high stiffness and a low mass. In order to define an optimal girder support, a parametric study was conducted varying both the number and location of support points. Based on the resulting arrangement of support points, topology optimizations were performed to achieve a high stiffness and a high first natural frequency. The following transformation of the results into parametric constructions allowed further parametric studies to find optimal geometry parameters leading to the aimed girder properties. In addition to that, bio-inspired structures based on marine organisms were applied to the girder which likewise resulted in improved girder properties.
	Slides THOAMA01 [10.895 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THOAMA02	LCLS NEH Floor Thermal Deformation and Mitigation Plan
	L. Zhang, J.C. Castagna, M. R. Holmes SLAC, Menlo Park, California, USA
	The key features of LCLS-II upgrade are the high repetition rate up to 1 MHz, and two variable-gap undulators (SXR and HXR). To take the advantages of this major upgrade, LCLS, SLAC is designing and building new soft and tender X-ray beamlines (TMO, TXI, RIXS, XPP). The laser pump FEL probe, or SXR FEL pump HXR probe experiments need sub-micron stability in a time range from 5 ms to a few hours. Dynamically bendable KB mirror can focus X-ray beam down to 300 nm. The overlap of the pump laser (or FEL), probe FEL beam and sample is challenging. Some measurements on vibration and long term stability have been carried out on the floor in the Near Experimental Hall (NEH) to host the new beamlines. The vibration displacement in the frequency range of 1 to 200 Hz is at the level of 25 nm. The floor deformation over hours and days measured by HLS and interferometer, however, show tens micro-meters displacement variation. This huge floor deformation is incompatible with the stability requirement. In this paper, we will present the simulation of the whole NEH building, comparison with measurement results, describe mitigation plan and predict the performance.
	Slides THOAMA02 [15.109 MB]
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THOAMA03	Mechanical Engineering Design and Simulation for SPIRAL2 Accelerator @GANIL	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)

Paper

Title

Page

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

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)

WEPH22

Le Guide for Support: A Cookbook for Modeling of Accelerator Structures*

252

C.A. Preissner, S.J. Izzo, Z. Liu, J. Nudell
ANL, Argonne, Illinois, USA

Funding: * Argonne National Laboratory's work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract DE-AC02- 06CH11357.
The Advanced Photon Source-Upgrade (APS-U) project has stringent specifications and a 12 month installation schedule. Some form of these constraints appear to be common at all multi-bend achromat upgrade projects. At the APS-U, no full tests will be made of the final accelerator support design. The evaluation of the final design against the specifications will be based primarily on computer simulations using virtual inputs. Insuring that the final designs meet specifications solely based on simulations is much like cooking a complex, multi-course meal without a trial run. Producing a successful meal on the first try requires a prior understanding of the ingre-dients, techniques, and interactions between the constituents. A good cookbook can be essential in providing this under-standing. Likewise, producing an accelerator support final design that meets the requirements requires a prior under-standing of the materials, components, techniques, and interactions between them. This poster describes a cookbook-style approach that any design team can use to confidently predict important characteristics such as natural frequency and ambient vibration response with an error of around 10%.

Poster WEPH22 [0.541 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH22

Export •

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

THOAMA01

Optimizing the PETRA IV Girder by Using Bio-Inspired Structures

297

S. Andresen
Alfred-Wegener-Institut, Bremerhaven, Germany

The PETRA IV project at DESY (Deutsches Elektronen Synchrotron) aims at building a unique synchrotron light source to provide beams of hard X-rays with unprecedented coherence properties that can be focused to dimensions in the nanometer-regime. An optimization of the girder structure is necessary to reduce the impact of ambient vibrations on the particle beam. For this purpose, several numerical approaches have been made to simultaneously reach natural frequencies above 50 Hz, a high stiffness and a low mass. In order to define an optimal girder support, a parametric study was conducted varying both the number and location of support points. Based on the resulting arrangement of support points, topology optimizations were performed to achieve a high stiffness and a high first natural frequency. The following transformation of the results into parametric constructions allowed further parametric studies to find optimal geometry parameters leading to the aimed girder properties. In addition to that, bio-inspired structures based on marine organisms were applied to the girder which likewise resulted in improved girder properties.

Slides THOAMA01 [10.895 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA01

Export •

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

THOAMA02

LCLS NEH Floor Thermal Deformation and Mitigation Plan

L. Zhang, J.C. Castagna, M. R. Holmes
SLAC, Menlo Park, California, USA

The key features of LCLS-II upgrade are the high repetition rate up to 1 MHz, and two variable-gap undulators (SXR and HXR). To take the advantages of this major upgrade, LCLS, SLAC is designing and building new soft and tender X-ray beamlines (TMO, TXI, RIXS, XPP). The laser pump FEL probe, or SXR FEL pump HXR probe experiments need sub-micron stability in a time range from 5 ms to a few hours. Dynamically bendable KB mirror can focus X-ray beam down to 300 nm. The overlap of the pump laser (or FEL), probe FEL beam and sample is challenging. Some measurements on vibration and long term stability have been carried out on the floor in the Near Experimental Hall (NEH) to host the new beamlines. The vibration displacement in the frequency range of 1 to 200 Hz is at the level of 25 nm. The floor deformation over hours and days measured by HLS and interferometer, however, show tens micro-meters displacement variation. This huge floor deformation is incompatible with the stability requirement. In this paper, we will present the simulation of the whole NEH building, comparison with measurement results, describe mitigation plan and predict the performance.

Slides THOAMA02 [15.109 MB]

Export •

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

THOAMA03

Mechanical Engineering Design and Simulation for SPIRAL2 Accelerator @GANIL

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)