MEDSI2018 - Classification: Simulation / Thermal

Paper	Title	Page
WEPH07	Photon Beam Applied as Heat Flux on Irregular Surfaces in FEA	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
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WEPH10	Thermal-Distortion Predictions of a Silicon Monochromator Using the Finite Element Under Extreme Heat Load
	L. Gao IHEP, Beijing, People's Republic of China
	X-ray crystal monochromators of high thermal load exposed to white-beam in third generation synchrotron light sources are subject to thermal deformations that must be minimized using an optimized cooling structure. Finite-element analysis is used to calculate the crystal thermal deformations and optimize the cooling structure by changing crystal size and cooling structure. Optimization results are displayed. The heat absorbers consist of two copper cooling clamped to the crystal side faces via an indium foil in order to ensure a good thermal contact and to relax the thermal deformation. Those absorbers are each composed of 16 cooling fins regularly spaced and carved from the cooper block. The cooling fluid of high fin position is higher than the silicon crystal surface. The cooling structure can dissipate a heat load up to 800W& power density 10W/mm2.
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WEPH12	Thermo-Mechanical Aspects of the MOBIPIX, a Compact X-Ray Imaging System with Embedded GPU	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
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WEPH16	Thermal Analysis of High Heat Load Mirrors for the in-Situ Nanoprobe Beamline of the APS Upgrade	238
	J.J. Knopp, M.V. Fisher, Z. Liu, J. Maser, R. Reininger, X. Shi ANL, Argonne, Illinois, USA
	The Advanced Photon Source (APS) is currently in the process of upgrading to a multi-bend achromat (MBA) storage ring, which will increase brightness and coherent flux by several orders of magnitude. The planned In-Situ Nanoprobe (ISN) beamline, one of the feature beamlines of the APS Upgrade (APS-U) project, is a 220 m long beamline that aims to focus the x-ray beam to a spot size of 20 nm or below by focusing with a KB pair. A double-mirror system, consisting of a high heat load mirror and a pink beam mirror, is designed to provide high harmonic rejection, reduce the power transmitted to the monochromator, and focus the beam along the vertical direction to a beam-defining aperture (BDA). One of the key issues is to manage the high power and power density absorbed by these mirrors. To attain the best focus at the BDA, the pink beam mirror needs to be mechanically bent to correct for thermal deformations on both mirrors. In this paper we report on the thermal responses of the mirror system to different undulator tunings and cooling schemes as calculated with Finite Element Analysis (FEA) and optical ray tracing.
	Poster WEPH16 [0.742 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH16
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WEPH27	High Heat Load Optics
	J. Seltmann DESY, Hamburg, Germany
	Beamline P04 at the 6GeV storage ring PETRA-III is a XUV to soft x-ray facility in the range of 250-3000eV. High K (up to K=6.5) operation of the 5m long APPLE-2 undulator result in high on-axis heat load. The absorbed power on the first mirror will be up to 1.6 kW (100 mA ring current, linearly polarized light). This mirror is located 46 m upstream of the focal spot, therefor has optical requirements of a tangential slope error of less than 1 µrad and has to be operated under UHV-conditions. Previous FEM studies * pointed towards an internal cooling concept based on liquid nitrogen, to cope with the high heat load and the optical needs. This initial concept has been improved with further FEM simulations and the technical feasibility of a cryo-stable metal to silicon connection for the coolant was proven under vacuum conditions. * Hans-B. Peters, Finite Elemente Berechnung, Silizium-Planspiegel M1 für XUV-Strahl in Petra-III, Beamline P04, DESY / Abtlg. ZM1, Hamburg, den 23.01.2008
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WEPH28	A Note of Thermal Analysis in Synchrotron Radiation Accelerator Engineering	264
	I.C. Sheng NSRRC, Hsinchu, Taiwan
	Thermal and thermomechanical analysis is one of the key process while designing accelerator components that may subject to synchrotron radiation heating. Even some closed-form solutions are available, and yet as to complex geometry numerical analysis such as finite element method (FEM) is commonly used to obtain the result. However due to its complexity of density distribution of the heat load, implementing such boundary conditions in the FEM model is relatively tedious. In this report we provide a simplified, practical and more conservative method to apply heat load both for bending magnet and insertion device. In addition, a general purpose synchrotron radiation heating numerical modeling is also introduced.
	Poster WEPH28 [0.390 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH28
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THOAMA04	Design and FEA of an Innovative Rotating Sic Filter for High-Energy X-Ray Beam	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
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THOAMA05	3D Numerical Ray Tracing for the APS-Upgrade Storage Ring Vacuum System Design	312
	J.A. Carter ANL, Argonne, Illinois, USA
	Funding: Argonne National Laboratory's work is supported by the U.S. Department of Energy, Office of Science under contract DE-AC02-06CH11357 The APS-Upgrade project will build a diffraction lim-ited storage ring requiring a vacuum system design with small aperture vacuum chambers passing through narrow magnet poles. The small apertures dictate that the walls of the vacuum chambers act as distributed photon ab-sorbers. The vacuum chambers must be designed robustly so a thorough understanding of the synchrotron ray trac-ing with beam missteering is required. A MatLab program has been developed to investigate 3D ray tracing with beam missteering. The program dis-cretizes local phase spaces of deviation possibilities along the beam path in both the horizontal and vertical planes of motion and then projects rays within a 3D mod-el of the vacuum system. The 3D model contains ele-ments in sequence along the beam path which represent both chamber segments and photon absorbers. Ray strikes are evaluated for multiple worst-case criteria such as local power intensity or strike offset from cooling channels. The worst case results are plotted and used as boundary conditions for vacuum chamber ther-mal/structural analyses. The results have also helped inform decisions about practical beam position limits.
	Slides THOAMA05 [6.832 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA05
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THOAMA06	A New X-Ray Beam for the ESRF Beamlines, Opto-Mechanical Global Survey	316
	Y. Dabin, R. Barrett, SJ. Jarjayes, M. Sanchez del Rio ESRF, Grenoble, France
	The new ESRF photon source EBS, introduces important changes for the beamlines. Half of them are concerned with the concept of low beta (small source size/ high divergence). This survey is an opto-mechanical review with all of the thermal/high heat-load issues on optics. This plan uses new package, OASYS aimed at making X-ray beam simulations for most optical parameters. White beam aspects are introduced, using ANSYS and COMSOL modules, leading to beam propagation FEA analysis with deformed optics. This presentation describes the optical aspects of the ESRF beamlines (high/low beta optics), and their transition towards this new source. Some key issues like IDs beam illumination; power filtering and optimization of the best part of the spectrum are detailed. Mirrors and monochromator crystals deformation will be presented, first for the day-one best conditions. As a second issue, OASYS enables to simulate the full beamline, from the IDs to the experiment, allowing simulating virtual experiments, with samples. This work is developed through many ESRF contributors; first the OASYS designers, Optics group, and then opto-mechanical experts, in association with mechanical engineering. OASYS (OrAnge SYnchrotron Suite) is a simulation tool suite (2013)- This open source platform supports SHADOW, XOP, SRW (source)-Maintained and distributed by the ESRF-M. Sanchez Del Rio-L. Rebuffi
	Slides THOAMA06 [7.552 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA06
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Paper

Title

Page

Photon Beam Applied as Heat Flux on Irregular Surfaces in FEA

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]

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

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WEPH10

Thermal-Distortion Predictions of a Silicon Monochromator Using the Finite Element Under Extreme Heat Load

L. Gao
IHEP, Beijing, People's Republic of China

X-ray crystal monochromators of high thermal load exposed to white-beam in third generation synchrotron light sources are subject to thermal deformations that must be minimized using an optimized cooling structure. Finite-element analysis is used to calculate the crystal thermal deformations and optimize the cooling structure by changing crystal size and cooling structure. Optimization results are displayed. The heat absorbers consist of two copper cooling clamped to the crystal side faces via an indium foil in order to ensure a good thermal contact and to relax the thermal deformation. Those absorbers are each composed of 16 cooling fins regularly spaced and carved from the cooper block. The cooling fluid of high fin position is higher than the silicon crystal surface. The cooling structure can dissipate a heat load up to 800W& power density 10W/mm2.

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

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

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WEPH16

Thermal Analysis of High Heat Load Mirrors for the in-Situ Nanoprobe Beamline of the APS Upgrade

238

J.J. Knopp, M.V. Fisher, Z. Liu, J. Maser, R. Reininger, X. Shi
ANL, Argonne, Illinois, USA

The Advanced Photon Source (APS) is currently in the process of upgrading to a multi-bend achromat (MBA) storage ring, which will increase brightness and coherent flux by several orders of magnitude. The planned In-Situ Nanoprobe (ISN) beamline, one of the feature beamlines of the APS Upgrade (APS-U) project, is a 220 m long beamline that aims to focus the x-ray beam to a spot size of 20 nm or below by focusing with a KB pair. A double-mirror system, consisting of a high heat load mirror and a pink beam mirror, is designed to provide high harmonic rejection, reduce the power transmitted to the monochromator, and focus the beam along the vertical direction to a beam-defining aperture (BDA). One of the key issues is to manage the high power and power density absorbed by these mirrors. To attain the best focus at the BDA, the pink beam mirror needs to be mechanically bent to correct for thermal deformations on both mirrors. In this paper we report on the thermal responses of the mirror system to different undulator tunings and cooling schemes as calculated with Finite Element Analysis (FEA) and optical ray tracing.

Poster WEPH16 [0.742 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH16

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WEPH27

High Heat Load Optics

J. Seltmann
DESY, Hamburg, Germany

Beamline P04 at the 6GeV storage ring PETRA-III is a XUV to soft x-ray facility in the range of 250-3000eV. High K (up to K=6.5) operation of the 5m long APPLE-2 undulator result in high on-axis heat load. The absorbed power on the first mirror will be up to 1.6 kW (100 mA ring current, linearly polarized light). This mirror is located 46 m upstream of the focal spot, therefor has optical requirements of a tangential slope error of less than 1 µrad and has to be operated under UHV-conditions. Previous FEM studies * pointed towards an internal cooling concept based on liquid nitrogen, to cope with the high heat load and the optical needs. This initial concept has been improved with further FEM simulations and the technical feasibility of a cryo-stable metal to silicon connection for the coolant was proven under vacuum conditions.
* Hans-B. Peters, Finite Elemente Berechnung, Silizium-Planspiegel M1 für XUV-Strahl in Petra-III, Beamline P04, DESY / Abtlg. ZM1, Hamburg, den 23.01.2008

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WEPH28

A Note of Thermal Analysis in Synchrotron Radiation Accelerator Engineering

264

I.C. Sheng
NSRRC, Hsinchu, Taiwan

Thermal and thermomechanical analysis is one of the key process while designing accelerator components that may subject to synchrotron radiation heating. Even some closed-form solutions are available, and yet as to complex geometry numerical analysis such as finite element method (FEM) is commonly used to obtain the result. However due to its complexity of density distribution of the heat load, implementing such boundary conditions in the FEM model is relatively tedious. In this report we provide a simplified, practical and more conservative method to apply heat load both for bending magnet and insertion device. In addition, a general purpose synchrotron radiation heating numerical modeling is also introduced.

Poster WEPH28 [0.390 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH28

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

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

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

THOAMA05

3D Numerical Ray Tracing for the APS-Upgrade Storage Ring Vacuum System Design

312

J.A. Carter
ANL, Argonne, Illinois, USA

Funding: Argonne National Laboratory's work is supported by the U.S. Department of Energy, Office of Science under contract DE-AC02-06CH11357
The APS-Upgrade project will build a diffraction lim-ited storage ring requiring a vacuum system design with small aperture vacuum chambers passing through narrow magnet poles. The small apertures dictate that the walls of the vacuum chambers act as distributed photon ab-sorbers. The vacuum chambers must be designed robustly so a thorough understanding of the synchrotron ray trac-ing with beam missteering is required. A MatLab program has been developed to investigate 3D ray tracing with beam missteering. The program dis-cretizes local phase spaces of deviation possibilities along the beam path in both the horizontal and vertical planes of motion and then projects rays within a 3D mod-el of the vacuum system. The 3D model contains ele-ments in sequence along the beam path which represent both chamber segments and photon absorbers. Ray strikes are evaluated for multiple worst-case criteria such as local power intensity or strike offset from cooling channels. The worst case results are plotted and used as boundary conditions for vacuum chamber ther-mal/structural analyses. The results have also helped inform decisions about practical beam position limits.

Slides THOAMA05 [6.832 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA05

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THOAMA06

A New X-Ray Beam for the ESRF Beamlines, Opto-Mechanical Global Survey

316

Y. Dabin, R. Barrett, SJ. Jarjayes, M. Sanchez del Rio
ESRF, Grenoble, France

The new ESRF photon source EBS, introduces important changes for the beamlines. Half of them are concerned with the concept of low beta (small source size/ high divergence). This survey is an opto-mechanical review with all of the thermal/high heat-load issues on optics. This plan uses new package, OASYS aimed at making X-ray beam simulations for most optical parameters. White beam aspects are introduced, using ANSYS and COMSOL modules, leading to beam propagation FEA analysis with deformed optics. This presentation describes the optical aspects of the ESRF beamlines (high/low beta optics), and their transition towards this new source. Some key issues like IDs beam illumination; power filtering and optimization of the best part of the spectrum are detailed. Mirrors and monochromator crystals deformation will be presented, first for the day-one best conditions. As a second issue, OASYS enables to simulate the full beamline, from the IDs to the experiment, allowing simulating virtual experiments, with samples. This work is developed through many ESRF contributors; first the OASYS designers, Optics group, and then opto-mechanical experts, in association with mechanical engineering.
OASYS (OrAnge SYnchrotron Suite) is a simulation tool suite (2013)- This open source platform supports SHADOW, XOP, SRW (source)-Maintained and distributed by the ESRF-M. Sanchez Del Rio-L. Rebuffi

Slides THOAMA06 [7.552 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA06

Export •

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