MEDSI2016 - Classification: Calculation, Simulation & FEA Methods / Thermal, Structural Statics and Dynamics

Paper	Title	Page
MOTB02	Finite Element Analysis in Design of Synchrotron Instrumentation - Issues, Good Practices and New Horizons
	B. Brajuskovic ANL, Argonne, Illinois, USA
	Finite Element Analysis(FEA) is a design tool widely implemented in the design of synchrotron instrumentation to predict behavior of a particular design under the assumed real life conditions. Although FEA is a very popular and trusted design tool in use for several decades, it is of paramount importance to emphasize that it is only as accurate as the user’s input into the analysis and the interpretation of the results. In its introduction the tutorial will cover the importance of accurate inputs into the analysis and correct interpretation of the results as well as the best practices in how to improve said accuracies. Second part will cover the nature of the phenomena analyzed with thermal and structural simulations with the emphasis on the seemingly paradoxical fact that thermally loaded structures frequently fail only upon load removal. The third part will cover thermal and structural simulations with several examples. The tutorial will be concluded with alternate applications of FEA in the design of synchrotron instrumentation. Examples of multi-physic and vibration analysis, component weight optimization, and the analysis of the acoustic levitation supports will be presented.
	Slides MOTB02 [9.854 MB]
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TUPE01	DMM Thermal Mechanical Design	152
	J.H. Kelly DLS, Oxfordshire, United Kingdom
	A Double Multilayer Monochromator (DMM) was designed in-house for the VMXi beamline. Thermal mechanical finite element analysis was performed to design a novel optic geometry, employing In/Ga eutectic cooling. The integration of a DMM into the existing beamline required additional power management components, such as a low energy power filter, a power detector and compact CuCrZr masks. This paper describes the thermal management challenges and their solutions. The DMM has been fully commissioned and is operational within the original I02 beamline.
	Poster TUPE01 [6.566 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE01
About •	paper received ※ 08 September 2016 paper accepted ※ 20 September 2016 issue date ※ 22 June 2017
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TUPE02	Experimental Validated CFD Analysis on Helium Discharge	156
	J.-C. Chang, Y.C. Chang, F.Z. Hsiao, S.P. Kao, H.C. Li, W.R. Liao, C.Y. Liu NSRRC, Hsinchu, Taiwan
	National Synchrotron Radiation Research Center in Taiwan (NSRRC) had set up three cryogenic systems to provide liquid helium to superconducting radio-frequency (SRF) cavities, insertion devices, and highly brilliant hard X-ray. The first one could produce liquid helium 134 LPH, with maximum cooling capacity of 469 W at 4.5 K. The second one could produce liquid helium 138 LPH, with maximum cooling capacity of 475 W at 4.5 K. The third one could produce liquid helium 239 LPH, with maximum cooling capacity of 890 W at 4.5 K. However, large liquid helium discharge in a closed space will cause personnel danger of lack of oxygen. We performed Computational Fluid Dynamic (CFD) simulation to analyse helium discharge through a SRF cavity in the Taiwan Light Source (TPS) tunnel. We simulated cases of helium discharge flow rates from 0.1 kg/s to 4.2 kg/s with and without fresh air supplied from the air conditioning system. We also set up both physical and numerical models within a space of 2.4m in length, 1.2m in width and 0.8m in height with nitrogen discharge inside to validate the CFD simulation.
	Poster TUPE02 [0.671 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE02
About •	paper received ※ 08 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017
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TUPE04	Coherent Soft X-Ray EPU Vacuum Chamber Thermal Analysis for Synchrotron Radiation Protection	159
	H.C. Fernandes, P.L. Cappadoro, D.A. Harder, D.A. Hidas, C.A. Kitégi, M. Musardo, J. Rank, T. Tanabe BNL, Upton, Long Island, New York, USA
	Funding: Department of Energy The purpose of this study was to determine the effect of beam mis-steering, on the temperature of the vacuum chamber. The chamber used for this study was for the Coherent Soft X-Ray (CSX) Elliptically Polarizing Undulator (EPU). Finite Element Analysis was conducted on the vacuum chamber to determine the temperature distribution on the chamber for set values of beam mis-steer, for NSLS-II. These results were then compared with on-site temperature measurements taken using RTD¿s, as well as thermal sensitive cameras. The accuracy of these results was analyzed and further FEA studies were proposed for steeper beam mis-steers and beam offsets.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE04
About •	paper received ※ 09 September 2016 paper accepted ※ 20 September 2016 issue date ※ 22 June 2017
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TUPE05	Numerical Simulation of the ALBA Synchrotron Light Source Cooling System Response for Failure Prevention	162
	X. Escaler UPC, Barcelona, Spain J.J. Casas, C. Colldelram, M. Prieto, M. Quispe ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	The ALBA Synchrotron Light Source cooling system is designed with a common return pipe that interconnects the four consumption rings. Such configuration is believed to compromise its optimal operation. To understand its thermo-fluid dynamic behaviour, a detailed 1D model has been built comprising all the components such as the pipes, fittings, bends, valves, pumping stations, heat exchangers and so on, and the various regulation mechanisms. Preliminarily, the model results in steady state operating conditions have been compared with experimental measurements and the maximum deviations have been found below 13%. Then, a series of transient numerical simulations have been carried out to determine the system response. Specifically, effects of the blockage and leakage of a consumption line as well as the increase and decrease of heat duty for the tunnel rings have been investigated. As a result, the stability of the system has been evaluated and the operational limits have been estimated in front of hydraulic and thermal load variations. Moreover, particular behaviors have been identified which can be used to design monitoring and control strategies to prevent unexpected failures.
	Poster TUPE05 [0.615 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE05
About •	paper received ※ 07 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017
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TUPE06	Thermo-Fluid Numerical Simulation of the Crotch Absorbers’ Cooling Pinholes for ALBA Storage Ring	165
	X. Escaler, V. Arbo Sangüesa UPC, Barcelona, Spain J.J. Casas, C. Colldelram, M. Prieto, M. Quispe ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	The ALBA Synchrotron Light Facility crotch absorbers, that remove the unused storage ring radiation, incorporate an internal cooling system composed by a number of parallel pinholes and by the corresponding stainless steel inner tubes inserted into each of them. Water flows in the resulting annular sections to evacuate the total heat power. Around each inner tube, a spiral wire is fixed along the whole length with a given pitch height in order to enhance the convection heat transfer. The influence of several design parameters on the absorber thermo-fluid behavior has been evaluated by means of the CFD software ANSYS CFX. In particular, the wall heat transfer coefficients and the pressure losses through a single pinhole have been evaluated for a range of different flow rates and pitch heights. Moreover, some modifications of the end wall geometry have been simulated as well as the effect of reversing the flow direction inside the channels. Finally, the critical crotch absorber type 3 has also been simulated and the limiting pitch height-flow rate combinations have been found based on the available driving pressure of the cooling system.
	Poster TUPE06 [1.546 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE06
About •	paper received ※ 07 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017
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TUPE08	Finite Element Analysis of a Photon Absorber Based on Volumetric Absorption of the Photon Beam	169
	K.J. Suthar, P.K. Den Hartog ANL, Argonne, Illinois, USA
	Funding: This research used resources of the APS, a U.S. Department of Energy (DOE) Office of Science User Facility operated by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Designing photon absorbers for next generation multibend achromat storage rings can be challenging considering the high power densities and limited space that will typically be present. The potential for problematically high material temperatures and thermal gradients can be expected to be greater than that for previous generation machines on account of the shorter source-to-receiving surface distances. Conventionally, photon absorbers are made from copper which is highly opaque to x-rays. A consequence of this is that the majority of the heat is absorbed within a very short distance of the surface. Utilizing materials that allow a more volumetric absorption of the radiation can improve the efficiency of heat removal as it can keep surface temperatures and thermal gradients lower than would otherwise be possible. This paper discusses multiphysics analysis of a crotch absorber for the APS Upgrade project (APS-U) via full-coupling of heat-transfer and structural mechanics. The simulation results are discussed in detail.
	Poster TUPE08 [1.943 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE08
About •	paper received ※ 10 September 2016 paper accepted ※ 23 September 2016 issue date ※ 22 June 2017
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TUPE09	Thermo-Fluid Study of the UPC Race-Track Microtron Cooling System	173
	X. Escaler, V. Blasco, Yu.A. Kubyshin, J.A. Romero, A. Sanchez UPC, Barcelona, Spain M. Prieto ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain V.I. Shvedunov SINP MSU, Moscow, Russia
	The cooling system of the race-track microtron (RTM), which is under construction at the Universitat Politècnica de Catalunya (UPC), has been simulated by means of a computational fluid dynamics (CFD) software. The hydraulic and thermal performance of the system has been studied for various operation conditions. Firstly, the hydraulic model has been validated by comparison with experimental measurements at different flow rates. Then, the cooling fluid temperatures and the pressure losses of the system have been determined and the capacity of the current design to remove the generated heat at nominal power has been confirmed. Finally, the wall maximum and average temperatures and heat transfer coefficients inside the magnets and the accelerating structure have been calculated. These results have allowed us to localize sections of the cooling system with a low convection due to detached flows where, therefore, a risk of zones of high temperatures exists. An optimization of the cooling circuit with the aim to reduce such high temperature zones has been proposed.
	Poster TUPE09 [0.552 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE09
About •	paper received ※ 02 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017
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TUPE10	A Thermal Exploration of Different Monochromator Crystal Designs	176
	J.S. Stimson, M.C.L. Ward BCU, Birmingham, United Kingdom S. Diaz-Moreno, P. Docker, J. Kay, J. Sutter DLS, Oxfordshire, United Kingdom
	Eight potential monochromator crystal designs were subjected to a combination of three different beam powers on two different footprints. The temperature and thermal deformation were determined for each. It was found that thermal deformation of the lattice is negligible compared to the surface curvature, and that while the thinnest crystal wafer showed the smallest temperature increase, crystals cooled from the bottom alone demonstrated a far more uniform thermal deformation and a larger radius of curvature.
	Poster TUPE10 [3.411 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE10
About •	paper received ※ 10 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017
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TUPE11	Study on Thermal Mechanical Design and Optimization Analysis for the ALBA Infrared Microspectroscopy Beamline (MIRAS) Extraction Mirror Based on Finite Element Analysis	179
	M. Quispe, A. Carballedo, J.J. Casas, C. Colldelram, A. Crisol, G. Peña, L. Ribó, I. Sics, I. Yousef ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	This paper reports design, modelling, simulation and optimization results for the ALBA MIRAS infrared radiation extraction mirror. Finite element analysis (FEA) was used to simulate the thermal mechanical behaviour of the device. With the aim to ensure a good thermal performance, conservative assumptions were applied: all of the incident Bending Magnet (BM) radiation is absorbed at the mirror surface, constant bending magnetic field and low thermal contact between the mirror Al 6061 and the OFHC copper arm. A novel solution has been implemented in order to provide an effective cooling by a natural convection on the in-air part of extraction mirror assembly. This has voided the necessity for a water cooling that often causes problems due to the associated vibrations. The power conditions were calculated by using SynRad+. The main ALBA Storage Ring design parameters are: 3 GeV, 400 mA and 1.42 T. According to these conditions, the mirror absorbs 15 W with a peak power density of 0.51 W/mm2. The peak temperature calculated was 63.2 °C. The real measurements reported during the commissioning stage showed a good thermal performance, in agreement with the results predicted by FEA.
	Poster TUPE11 [0.881 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE11
About •	paper received ※ 09 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017
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TUPE12	Developing White Beam Components of TPS Beamline 24A	183
	M.H. Lee, C.Y. Chang, C.H. Chang, S.H. Chang, C. Chen, C.C. Chiu, L. Huang, L. Lai, L. Lee, D.G. Liu, Y. Su, H.Y. Yan NSRRC, Hsinchu, Taiwan
	The TPS 24A, Soft X-ray Tomography (SXT) beamline, is one of the beamlines in the second construction phase at the Taiwan Photon Source (TPS). This bending magnet (BM) beamline has high flux in the range between 260 eV and 2600 eV. It is designed for transmission full-field imaging of frozen-hydrated biological samples. At the exit slit, the beam flux optimized in 520 eV is 282 billion photons/second with resolving power 2000, the beam size is 0.05 mm × 0.06 mm (V × H, FWHM) and the beam divergence is 1.73 mrad × 1.57 mrad (V × H, FWHM). By contributions of the generic beamline components project in recent years, modular mechanisms would be used in this beamline such as mask, X-ray beam position monitor (XBPM), photon absorber (PAB), and screens. However, these beamline components were designed for ID beamlines, so they should be redesigned for BM beamlines. This paper generally introduce these beamline components decided and redesigned for the TPS 24A. They will play important roles at the BM beam-lines in the future.
	Poster TUPE12 [1.355 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE12
About •	paper received ※ 09 September 2016 paper accepted ※ 22 September 2016 issue date ※ 22 June 2017
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TUPE13	Numerical Simulation of the ALBA Synchrotron Light Source Cooling System Response to Pump Start-Up and Shut-Down	187
	X. Escaler, D. Juan Garcia UPC, Barcelona, Spain J.J. Casas, C. Colldelram, M. Prieto, M. Quispe ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	The ALBA Synchrotron Light Source cooling system is submitted to regular pump start-ups and shut-downs. Moreover, pumps can trip due to motor power failures. As a result, the piping system can be subjected to surges and pressure oscillations. The 1D thermo-fluid simulation software Flowmaster has been used to predict these transient conditions taking into account the fluid compressibility, the pipe elasticity, the characteristic time response of the check valves and the pump/motors moments of inertia. During pump start-ups, significant pressure rises are detected that can be reduced by readjusting the PID controller parameters. Unexpected pump shut-downs do not appear to provoke significant water hammer conditions. However, pressure fluctuations are generated mainly in the same pumping line but also in the rest of the system due to the particular common return configuration. In all the cases the pressure regulation mechanisms acting on the pump rotating speeds serve to attenuate the consequences of these transients. Finally, the feasibility of the model to simulate the effect on the system response of trapped air inside the pipes has also been evaluated.
	Poster TUPE13 [0.743 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE13
About •	paper received ※ 07 September 2016 paper accepted ※ 22 September 2016 issue date ※ 22 June 2017
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TUPE14	Study, Design and Optimization Analysis of the ALBA LOREA Dipole Vacuum Chamber and Crotch Absorbers Based on Finite Element Analysis	191
	M. Quispe, J. Campmany, J.J. Casas, C. Colldelram, A. Crisol, J. Marcos, G. Peña, M. Tallarida ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	This work deals with the FEA study, design and optimization of the LOREA dipole vacuum chamber and Glidcop Al-15 crotch absorbers. At present LOREA is the ninth beam-line being designed at ALBA with an Insertion Device (ID) consisting of an Apple II-type helical undulator. For the standard dipole chamber the vertical polarized light hits the walls because of the very narrow vertical aperture between the cooling channels. In vertical mode the ID vertical divergence equals ± 2.2 mrad and the peak power density and total power are 5.6 kW/mrad² and 5.5 kW, respectively. Due to the high power a temperature as high as more than 600 °C is calculated. In consequence the dipole chamber has to be modified and the absorbers have to withstand the Bending Magnet (BM) and ID radiation. The new absorbers have to be thicker and its cooling channels are farer from BM power deposition than the standard absorbers. The thermal mechanical simulations show good results, the new absorbers are in a safe range, the maximum temperature, stress and strain are 309.2 °C, 164.2 MPa and 0.14%, respectively. The main ALBA Storage Ring design parameters used in the simulations are: 3 GeV, 400 mA and 1.42 T (BM).
	Poster TUPE14 [1.524 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE14
About •	paper received ※ 09 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017
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TUPE15	Thermal Management and Crystal Clamping Concepts for the New High-Dynamics DCM for Sirius	194
	M. Saveri Silva, R.R. Geraldes, A. Gilmour LNLS, Campinas, Brazil T.A.M. Ruijl, R.M. Schneider MI-Partners, Eindhoven, The Netherlands
	Funding: Brazilian Ministry of Science, Technology and Inovation The monochromator is known to be one of the most critical optical elements of a synchrotron beamline, since it directly affects the beam quality with respect to energy and position. Naturally, the new 4th generation machines, with their small emittances, start to bring about higher stability performance requirements, in spite of factors as high power loads, power load variation, and vibration sources. A new high-dynamics DCM (Double Crystal Monochromator) is under development at the Brazilian Light Source for the Sirius EMA beamline (Extreme Condition X-ray Methods of Analysis). In order to achieve high-bandwidth control and stability of a few nrad, as well as to prevent unpredicted mounting and clamping distortions, new solutions are proposed for crystal fixation and thermal management. Since the design is based on flexural elements, it should be indeed highly predictable, so that the work was developed using mechanical and thermal FEA, including CFD. Efforts were made to predict thermal boundaries associated with the synchrotron beam, including incident, diffracted and scattered power, for which the undulator spectrum was employed in the Monte Carlo simulation package - FLUKA . "FLUKA: a multi-particle transport code", A. Ferrari, P.R. Sala, A. Fasso‘, and J. Ranft, CERN-2005-10 (2005), INFN/TC₀5/11, SLAC-R-773
	Poster TUPE15 [2.630 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE15
About •	paper received ※ 08 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017
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TUPE16	Design of A Leaf Spring Bender for Double Laue Crystal Monochromator at SSRF	198
	H.L. Qin, K. Yang SSRF, Shanghai, People’s Republic of China L. Jin, H. Zhang, W. Zhu SINAP, Shanghai, People’s Republic of China
	A leaf spring bender geometry for water-cooled double Laue crystal monochromator (DLM) is presented. The DLM will be employed to acquire high energy mono-chromatic X-ray (60keV to 120keV) on the ultra-hard applications beamline at SSRF. A compact bending mechanism is designed in order to get horizontally fo-cused high energy monochromatic X-ray as small as 0.5mm. The bender applies a piece of thin asymmetric crystal and a pair of leaf springs which push the crystal to a sagittally bent radius as small as 1 meter by a pair of symmetry moments. An optimized crystal geometry is achieved by taking into account the meridional and sagit-tal bendings coupled and defined by the anisotropic elas-ticity of the asymmetric crystal. Furthermore, thermal slope error and structural stress of the bent crystal are analyzed by finite element method (FEA).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE16
About •	paper received ※ 09 September 2016 paper accepted ※ 22 September 2016 issue date ※ 22 June 2017
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TUPE17	The development of CVD Diamond Based FEL Photon Stoppers in LCLSII
	H. Wang, Y. Feng, J. Krzywiński, E. Ortiz, M. Rowen SLAC, Menlo Park, California, USA
	Safety stoppers are required to absorb and stop the LCLS-II Free-Electron Laser (FEL) beam, which has the unique combination of extremely high peak fluence per pulse and enormous average power density. This is unprecedented at the existing 3rd generation synchrotron or current 4th generation low repetition rate FEL source, so that new solutions are required. CVD diamond has been proposed as the absorber material, for its low Z number, high thermal conductivity and high thermal shock resistance. The Photon Stopper design consists of a perimeter cooled CVD diamond absorber, clamped in between two copper (OFHC) heat sinks, with one looped with a water cooling line. The thermal studies include both steady state and instantaneous analysis. Diamond damage test results using LCLS FEL beam will also be reported.
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TUPE44	Optimization for the APS-U Magnet Support Structure	254
	Z. Liu, H. Cease, J.T. Collins, J. Nudell, C.A. Preissner ANL, Argonne, Illinois, USA
	Funding: Work supported by: Argonne is managed by UChicago Argonne, LLC, for the U.S. Department of Energy under contract DE-AC02-06CH11357. The Advanced Photon Source Upgrade (APSU) is to replace the existing storage ring with a multi-bend achromats (MBA) accelerator lattice . For the APS-U removal and installation, current planning calls for a 12-month shutdown and testing period, prior to resumption of operations. It calls for quick installation of the magnet support system with assembly and installation alignment tolerance. A three-point, semi-kinematic vertical mount for the magnet modules is the approach to reduce time for alignment. The longest section is the curved FODO section (four quads with three Q-bends interleaved, and a three-pole wiggler). All magnets of the FODO section sit on a single piece of support structure in order to have a good control over the magnet-to-magnet alignment tolerance. It brings challenge to minimize the top surface deflection and maximize the first mode frequency of the magnet support structure that is supported at three points. These constraints call for the need of optimizing the magnet support structures. Details of the optimization, including three-point positioning, material selection, and topology optimization, are reported in this study. Glenn Decker (2014) Design Study of an MBA Lattice for the Advanced Photon Source, Synchrotron Radiation News, 27:6, 13-17, DOI: 10.1080/08940886.2014.970932
	Poster TUPE44 [1.889 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE44
About •	paper received ※ 07 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017
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WEAA02	X-Ray Absorber Design and Calculations for the EBS Storage Ring	257
	F. Thomas, J.C. Biasci, D. Coulon, Y. Dabin, T. Ducoing, F. Ewald, E. Gagliardini, P. Marion ESRF, Grenoble, France F. Thomas ILL, Grenoble, France
	The Extremely Brilliant Source (EBS) of the ESRF will hold new type of X-Ray absorbers: a new material will be used (CuCr1Zr suggested by ) together with a novel design integrating: - CF flange are machined in the absorber body. No weld, no braze. - Optimized toothed surface profile, reducing the induced thermal stresses. - Compton and Rayleigh scattering integrated blocking shapes. - Concentric cooling channels. A brief overview of the new design and concepts will be given. The presentation will then focus on thermo-mechanical absorber ANSYS calculations, combining both Computational Fluid Mechanics (CFD). The calculations and the calculation process will be discussed as well as the design criteria chosen by the team. The CFD calculations will show that an heat transfer coefficient between the water and the copper part can be estimated as well as the pressure drop through the absorber. Finally, the stress analysis will be emphasized. The type of stresses (tensile, compressive or shear) and their nature (primary or secondary) will be linked to the choice of design criteria. S. Sharma, "A Novel Design of High Power Masks and Slits", Proc. of MEDSI2014, Australia (2014).
	Slides WEAA02 [1.968 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEAA02
About •	paper received ※ 11 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017
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WEAA03	Thermal Stability of the New ESRF Extremely Brilliant Source	262
	B. Tampigny, J.C. Biasci, J-F.B. Bouteille, Y. Dabin, M. Diot, L. Farvacque, F. Favier, A. Flaven-Bois, T. Marchial, D. Martin, P. Raimondi, P. Roux-Buisson ESRF, Grenoble, France F. Thomas ILL, Grenoble, France
	In the frame of the Extremely Brilliant Source project (EBS), studies dedicated to disturbances have been more intensively investigated. Engineering instabilities have two origins: mechanical and thermal. Major thermal issues are: - air conditioning presents a temperature ramp up of 2°C along the sector - storage ring requires a warm up period of 4 days for reaching a stable orbit These effects have been observed and corrected for 20 years. With EBS requirements, we need to identify these thermal effects in order to reduce the disturbances, thus improving more systematically the source stability. The study is lead by the comparison between the present and the new thermal system. To do so, it is necessary to evaluate the heat balance in this system, as well as to identify the thermal time constant of each component. FEA models have been performed to reveal sensitivity of these thermal issues. A full scale mock-up cell equipped with a prototype girder is measured with power cables inside. A FEA model was also developed for the present storage ring to analyse the air stream. Although investigations have already been developed, some others remain to be achieved by the end of 2016.
	Slides WEAA03 [4.824 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEAA03
About •	paper received ※ 10 September 2016 paper accepted ※ 23 September 2016 issue date ※ 22 June 2017
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WEAA04	Novel Numerical Method for Calculating the Shadow Projection and Collisions of a Multi-Axis Goniometer at Diamond	267
	V. Grama, A. Wagner DLS, Oxfordshire, United Kingdom
	Beamline I23 is a long-wavelength macromolecular crystallography beamline at Diamond Light Source. The end station is a unique instrument with a bespoke cryogenically cooled multi-axis goniometer and a large curved Pilatus 12M detector in a high vacuum environment. As experiments become limited by radiation damage to the crystals, optimised strategies are needed to orient crystals in the most efficient way to obtain a complete dataset with a minimal X-ray dose. Two key factors affect the optimisation strategies. Firstly, shadowing on the detector by the goniometer resulting in data loss in this region and secondly, collisions between the goniometer and other components in the end station restricting the available angular range for sample centering and data collection. This paper discusses the numerical methods for calculating the shadowing of a multi-axis goniometer on a semi-cylindrical detector and the calculation of the allowable angles for various conditions to prevent collisions with neighbouring components.
	Slides WEAA04 [61.267 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEAA04
About •	paper received ※ 07 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017
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WEBA01	Nostradamus and the Synchrotron Engineer: Key Aspects of Predicting Accelerator Structural Response	272
	C.A. Preissner, H. Cease, J.T. Collins, Z. Liu, J. Nudell ANL, Argonne, Illinois, USA B.N. Jensen MAX IV Laboratory, Lund University, Lund, Sweden
	Funding: Argonne is managed by UChicago Argonne, LLC, for the U.S. Department of Energy under contract DE-AC02-06CH11357. MBA designs are placing stringent mechanical tolerances on the magnet support systems. At the APS-U the mag-net-to-magnet vibration tolerances are about 10 nm . Timelines, installation requirements, and budgets constrain the resources available for prototyping and physical testing. Reliance on FEA to predict dynamic response is para-mount in insuring the tolerances are met. However, obtaining accurate results from a magnet support structure FEA is not as simple as analysing the CAD model of the structure. The 16th century author Nostradamus published a collection of prophecies that since his time, have been held up as predictions of various world events. While it is attractive to think his collection of short poems can be used to foretell the future, in reality it is only the vagueness and absence of any dates that make them easy to apply in a posthoc basis. Arguably, a similar statement can be made about the use of FEA in predicting accelerator support response. In this presentation the important contributors to FEA dynamic modelling will be discussed along with techniques that can be used to generate necessary data for models that can accurately predict response. APS-Upgrade, Functional Requirements Document, Advanced Photon Source, Argonne, IL, USA, APSU1695659, May 2016.
	Slides WEBA01 [14.136 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEBA01
About •	paper received ※ 10 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017
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Paper

Title

Page

MOTB02

Finite Element Analysis in Design of Synchrotron Instrumentation - Issues, Good Practices and New Horizons

B. Brajuskovic
ANL, Argonne, Illinois, USA

Finite Element Analysis(FEA) is a design tool widely implemented in the design of synchrotron instrumentation to predict behavior of a particular design under the assumed real life conditions. Although FEA is a very popular and trusted design tool in use for several decades, it is of paramount importance to emphasize that it is only as accurate as the user’s input into the analysis and the interpretation of the results. In its introduction the tutorial will cover the importance of accurate inputs into the analysis and correct interpretation of the results as well as the best practices in how to improve said accuracies. Second part will cover the nature of the phenomena analyzed with thermal and structural simulations with the emphasis on the seemingly paradoxical fact that thermally loaded structures frequently fail only upon load removal. The third part will cover thermal and structural simulations with several examples. The tutorial will be concluded with alternate applications of FEA in the design of synchrotron instrumentation. Examples of multi-physic and vibration analysis, component weight optimization, and the analysis of the acoustic levitation supports will be presented.

Slides MOTB02 [9.854 MB]

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TUPE01

DMM Thermal Mechanical Design

152

J.H. Kelly
DLS, Oxfordshire, United Kingdom

A Double Multilayer Monochromator (DMM) was designed in-house for the VMXi beamline. Thermal mechanical finite element analysis was performed to design a novel optic geometry, employing In/Ga eutectic cooling. The integration of a DMM into the existing beamline required additional power management components, such as a low energy power filter, a power detector and compact CuCrZr masks. This paper describes the thermal management challenges and their solutions. The DMM has been fully commissioned and is operational within the original I02 beamline.

Poster TUPE01 [6.566 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE01

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paper received ※ 08 September 2016 paper accepted ※ 20 September 2016 issue date ※ 22 June 2017

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TUPE02

Experimental Validated CFD Analysis on Helium Discharge

156

J.-C. Chang, Y.C. Chang, F.Z. Hsiao, S.P. Kao, H.C. Li, W.R. Liao, C.Y. Liu
NSRRC, Hsinchu, Taiwan

National Synchrotron Radiation Research Center in Taiwan (NSRRC) had set up three cryogenic systems to provide liquid helium to superconducting radio-frequency (SRF) cavities, insertion devices, and highly brilliant hard X-ray. The first one could produce liquid helium 134 LPH, with maximum cooling capacity of 469 W at 4.5 K. The second one could produce liquid helium 138 LPH, with maximum cooling capacity of 475 W at 4.5 K. The third one could produce liquid helium 239 LPH, with maximum cooling capacity of 890 W at 4.5 K. However, large liquid helium discharge in a closed space will cause personnel danger of lack of oxygen. We performed Computational Fluid Dynamic (CFD) simulation to analyse helium discharge through a SRF cavity in the Taiwan Light Source (TPS) tunnel. We simulated cases of helium discharge flow rates from 0.1 kg/s to 4.2 kg/s with and without fresh air supplied from the air conditioning system. We also set up both physical and numerical models within a space of 2.4m in length, 1.2m in width and 0.8m in height with nitrogen discharge inside to validate the CFD simulation.

Poster TUPE02 [0.671 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE02

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paper received ※ 08 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017

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TUPE04

Coherent Soft X-Ray EPU Vacuum Chamber Thermal Analysis for Synchrotron Radiation Protection

159

H.C. Fernandes, P.L. Cappadoro, D.A. Harder, D.A. Hidas, C.A. Kitégi, M. Musardo, J. Rank, T. Tanabe
BNL, Upton, Long Island, New York, USA

Funding: Department of Energy
The purpose of this study was to determine the effect of beam mis-steering, on the temperature of the vacuum chamber. The chamber used for this study was for the Coherent Soft X-Ray (CSX) Elliptically Polarizing Undulator (EPU). Finite Element Analysis was conducted on the vacuum chamber to determine the temperature distribution on the chamber for set values of beam mis-steer, for NSLS-II. These results were then compared with on-site temperature measurements taken using RTD¿s, as well as thermal sensitive cameras. The accuracy of these results was analyzed and further FEA studies were proposed for steeper beam mis-steers and beam offsets.

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE04

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paper received ※ 09 September 2016 paper accepted ※ 20 September 2016 issue date ※ 22 June 2017

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TUPE05

Numerical Simulation of the ALBA Synchrotron Light Source Cooling System Response for Failure Prevention

162

X. Escaler
UPC, Barcelona, Spain
J.J. Casas, C. Colldelram, M. Prieto, M. Quispe
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

The ALBA Synchrotron Light Source cooling system is designed with a common return pipe that interconnects the four consumption rings. Such configuration is believed to compromise its optimal operation. To understand its thermo-fluid dynamic behaviour, a detailed 1D model has been built comprising all the components such as the pipes, fittings, bends, valves, pumping stations, heat exchangers and so on, and the various regulation mechanisms. Preliminarily, the model results in steady state operating conditions have been compared with experimental measurements and the maximum deviations have been found below 13%. Then, a series of transient numerical simulations have been carried out to determine the system response. Specifically, effects of the blockage and leakage of a consumption line as well as the increase and decrease of heat duty for the tunnel rings have been investigated. As a result, the stability of the system has been evaluated and the operational limits have been estimated in front of hydraulic and thermal load variations. Moreover, particular behaviors have been identified which can be used to design monitoring and control strategies to prevent unexpected failures.

Poster TUPE05 [0.615 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE05

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paper received ※ 07 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017

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TUPE06

Thermo-Fluid Numerical Simulation of the Crotch Absorbers’ Cooling Pinholes for ALBA Storage Ring

165

X. Escaler, V. Arbo Sangüesa
UPC, Barcelona, Spain
J.J. Casas, C. Colldelram, M. Prieto, M. Quispe
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

The ALBA Synchrotron Light Facility crotch absorbers, that remove the unused storage ring radiation, incorporate an internal cooling system composed by a number of parallel pinholes and by the corresponding stainless steel inner tubes inserted into each of them. Water flows in the resulting annular sections to evacuate the total heat power. Around each inner tube, a spiral wire is fixed along the whole length with a given pitch height in order to enhance the convection heat transfer. The influence of several design parameters on the absorber thermo-fluid behavior has been evaluated by means of the CFD software ANSYS CFX. In particular, the wall heat transfer coefficients and the pressure losses through a single pinhole have been evaluated for a range of different flow rates and pitch heights. Moreover, some modifications of the end wall geometry have been simulated as well as the effect of reversing the flow direction inside the channels. Finally, the critical crotch absorber type 3 has also been simulated and the limiting pitch height-flow rate combinations have been found based on the available driving pressure of the cooling system.

Poster TUPE06 [1.546 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE06

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paper received ※ 07 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017

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TUPE08

Finite Element Analysis of a Photon Absorber Based on Volumetric Absorption of the Photon Beam

169

K.J. Suthar, P.K. Den Hartog
ANL, Argonne, Illinois, USA

Funding: This research used resources of the APS, a U.S. Department of Energy (DOE) Office of Science User Facility operated by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Designing photon absorbers for next generation multibend achromat storage rings can be challenging considering the high power densities and limited space that will typically be present. The potential for problematically high material temperatures and thermal gradients can be expected to be greater than that for previous generation machines on account of the shorter source-to-receiving surface distances. Conventionally, photon absorbers are made from copper which is highly opaque to x-rays. A consequence of this is that the majority of the heat is absorbed within a very short distance of the surface. Utilizing materials that allow a more volumetric absorption of the radiation can improve the efficiency of heat removal as it can keep surface temperatures and thermal gradients lower than would otherwise be possible. This paper discusses multiphysics analysis of a crotch absorber for the APS Upgrade project (APS-U) via full-coupling of heat-transfer and structural mechanics. The simulation results are discussed in detail.

Poster TUPE08 [1.943 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE08

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paper received ※ 10 September 2016 paper accepted ※ 23 September 2016 issue date ※ 22 June 2017

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TUPE09

Thermo-Fluid Study of the UPC Race-Track Microtron Cooling System

173

X. Escaler, V. Blasco, Yu.A. Kubyshin, J.A. Romero, A. Sanchez
UPC, Barcelona, Spain
M. Prieto
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
V.I. Shvedunov
SINP MSU, Moscow, Russia

The cooling system of the race-track microtron (RTM), which is under construction at the Universitat Politècnica de Catalunya (UPC), has been simulated by means of a computational fluid dynamics (CFD) software. The hydraulic and thermal performance of the system has been studied for various operation conditions. Firstly, the hydraulic model has been validated by comparison with experimental measurements at different flow rates. Then, the cooling fluid temperatures and the pressure losses of the system have been determined and the capacity of the current design to remove the generated heat at nominal power has been confirmed. Finally, the wall maximum and average temperatures and heat transfer coefficients inside the magnets and the accelerating structure have been calculated. These results have allowed us to localize sections of the cooling system with a low convection due to detached flows where, therefore, a risk of zones of high temperatures exists. An optimization of the cooling circuit with the aim to reduce such high temperature zones has been proposed.

Poster TUPE09 [0.552 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE09

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paper received ※ 02 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017

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TUPE10

A Thermal Exploration of Different Monochromator Crystal Designs

176

J.S. Stimson, M.C.L. Ward
BCU, Birmingham, United Kingdom
S. Diaz-Moreno, P. Docker, J. Kay, J. Sutter
DLS, Oxfordshire, United Kingdom

Eight potential monochromator crystal designs were subjected to a combination of three different beam powers on two different footprints. The temperature and thermal deformation were determined for each. It was found that thermal deformation of the lattice is negligible compared to the surface curvature, and that while the thinnest crystal wafer showed the smallest temperature increase, crystals cooled from the bottom alone demonstrated a far more uniform thermal deformation and a larger radius of curvature.

Poster TUPE10 [3.411 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE10

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paper received ※ 10 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017

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TUPE11

Study on Thermal Mechanical Design and Optimization Analysis for the ALBA Infrared Microspectroscopy Beamline (MIRAS) Extraction Mirror Based on Finite Element Analysis

179

M. Quispe, A. Carballedo, J.J. Casas, C. Colldelram, A. Crisol, G. Peña, L. Ribó, I. Sics, I. Yousef
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

This paper reports design, modelling, simulation and optimization results for the ALBA MIRAS infrared radiation extraction mirror. Finite element analysis (FEA) was used to simulate the thermal mechanical behaviour of the device. With the aim to ensure a good thermal performance, conservative assumptions were applied: all of the incident Bending Magnet (BM) radiation is absorbed at the mirror surface, constant bending magnetic field and low thermal contact between the mirror Al 6061 and the OFHC copper arm. A novel solution has been implemented in order to provide an effective cooling by a natural convection on the in-air part of extraction mirror assembly. This has voided the necessity for a water cooling that often causes problems due to the associated vibrations. The power conditions were calculated by using SynRad+. The main ALBA Storage Ring design parameters are: 3 GeV, 400 mA and 1.42 T. According to these conditions, the mirror absorbs 15 W with a peak power density of 0.51 W/mm2. The peak temperature calculated was 63.2 °C. The real measurements reported during the commissioning stage showed a good thermal performance, in agreement with the results predicted by FEA.

Poster TUPE11 [0.881 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE11

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paper received ※ 09 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017

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TUPE12

Developing White Beam Components of TPS Beamline 24A

183

M.H. Lee, C.Y. Chang, C.H. Chang, S.H. Chang, C. Chen, C.C. Chiu, L. Huang, L. Lai, L. Lee, D.G. Liu, Y. Su, H.Y. Yan
NSRRC, Hsinchu, Taiwan

The TPS 24A, Soft X-ray Tomography (SXT) beamline, is one of the beamlines in the second construction phase at the Taiwan Photon Source (TPS). This bending magnet (BM) beamline has high flux in the range between 260 eV and 2600 eV. It is designed for transmission full-field imaging of frozen-hydrated biological samples. At the exit slit, the beam flux optimized in 520 eV is 282 billion photons/second with resolving power 2000, the beam size is 0.05 mm × 0.06 mm (V × H, FWHM) and the beam divergence is 1.73 mrad × 1.57 mrad (V × H, FWHM). By contributions of the generic beamline components project in recent years, modular mechanisms would be used in this beamline such as mask, X-ray beam position monitor (XBPM), photon absorber (PAB), and screens. However, these beamline components were designed for ID beamlines, so they should be redesigned for BM beamlines. This paper generally introduce these beamline components decided and redesigned for the TPS 24A. They will play important roles at the BM beam-lines in the future.

Poster TUPE12 [1.355 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE12

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paper received ※ 09 September 2016 paper accepted ※ 22 September 2016 issue date ※ 22 June 2017

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TUPE13

Numerical Simulation of the ALBA Synchrotron Light Source Cooling System Response to Pump Start-Up and Shut-Down

187

X. Escaler, D. Juan Garcia
UPC, Barcelona, Spain
J.J. Casas, C. Colldelram, M. Prieto, M. Quispe
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

The ALBA Synchrotron Light Source cooling system is submitted to regular pump start-ups and shut-downs. Moreover, pumps can trip due to motor power failures. As a result, the piping system can be subjected to surges and pressure oscillations. The 1D thermo-fluid simulation software Flowmaster has been used to predict these transient conditions taking into account the fluid compressibility, the pipe elasticity, the characteristic time response of the check valves and the pump/motors moments of inertia. During pump start-ups, significant pressure rises are detected that can be reduced by readjusting the PID controller parameters. Unexpected pump shut-downs do not appear to provoke significant water hammer conditions. However, pressure fluctuations are generated mainly in the same pumping line but also in the rest of the system due to the particular common return configuration. In all the cases the pressure regulation mechanisms acting on the pump rotating speeds serve to attenuate the consequences of these transients. Finally, the feasibility of the model to simulate the effect on the system response of trapped air inside the pipes has also been evaluated.

Poster TUPE13 [0.743 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE13

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paper received ※ 07 September 2016 paper accepted ※ 22 September 2016 issue date ※ 22 June 2017

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TUPE14

Study, Design and Optimization Analysis of the ALBA LOREA Dipole Vacuum Chamber and Crotch Absorbers Based on Finite Element Analysis

191

M. Quispe, J. Campmany, J.J. Casas, C. Colldelram, A. Crisol, J. Marcos, G. Peña, M. Tallarida
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

This work deals with the FEA study, design and optimization of the LOREA dipole vacuum chamber and Glidcop Al-15 crotch absorbers. At present LOREA is the ninth beam-line being designed at ALBA with an Insertion Device (ID) consisting of an Apple II-type helical undulator. For the standard dipole chamber the vertical polarized light hits the walls because of the very narrow vertical aperture between the cooling channels. In vertical mode the ID vertical divergence equals ± 2.2 mrad and the peak power density and total power are 5.6 kW/mrad² and 5.5 kW, respectively. Due to the high power a temperature as high as more than 600 °C is calculated. In consequence the dipole chamber has to be modified and the absorbers have to withstand the Bending Magnet (BM) and ID radiation. The new absorbers have to be thicker and its cooling channels are farer from BM power deposition than the standard absorbers. The thermal mechanical simulations show good results, the new absorbers are in a safe range, the maximum temperature, stress and strain are 309.2 °C, 164.2 MPa and 0.14%, respectively. The main ALBA Storage Ring design parameters used in the simulations are: 3 GeV, 400 mA and 1.42 T (BM).

Poster TUPE14 [1.524 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE14

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paper received ※ 09 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017

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TUPE15

Thermal Management and Crystal Clamping Concepts for the New High-Dynamics DCM for Sirius

194

M. Saveri Silva, R.R. Geraldes, A. Gilmour
LNLS, Campinas, Brazil
T.A.M. Ruijl, R.M. Schneider
MI-Partners, Eindhoven, The Netherlands

Funding: Brazilian Ministry of Science, Technology and Inovation
The monochromator is known to be one of the most critical optical elements of a synchrotron beamline, since it directly affects the beam quality with respect to energy and position. Naturally, the new 4th generation machines, with their small emittances, start to bring about higher stability performance requirements, in spite of factors as high power loads, power load variation, and vibration sources. A new high-dynamics DCM (Double Crystal Monochromator) is under development at the Brazilian Light Source for the Sirius EMA beamline (Extreme Condition X-ray Methods of Analysis). In order to achieve high-bandwidth control and stability of a few nrad, as well as to prevent unpredicted mounting and clamping distortions, new solutions are proposed for crystal fixation and thermal management. Since the design is based on flexural elements, it should be indeed highly predictable, so that the work was developed using mechanical and thermal FEA, including CFD. Efforts were made to predict thermal boundaries associated with the synchrotron beam, including incident, diffracted and scattered power, for which the undulator spectrum was employed in the Monte Carlo simulation package - FLUKA *.
* "FLUKA: a multi-particle transport code", A. Ferrari, P.R. Sala, A. Fasso‘, and J. Ranft, CERN-2005-10 (2005), INFN/TC₀5/11, SLAC-R-773

Poster TUPE15 [2.630 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE15

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paper received ※ 08 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017

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TUPE16

Design of A Leaf Spring Bender for Double Laue Crystal Monochromator at SSRF

198

H.L. Qin, K. Yang
SSRF, Shanghai, People’s Republic of China
L. Jin, H. Zhang, W. Zhu
SINAP, Shanghai, People’s Republic of China

A leaf spring bender geometry for water-cooled double Laue crystal monochromator (DLM) is presented. The DLM will be employed to acquire high energy mono-chromatic X-ray (60keV to 120keV) on the ultra-hard applications beamline at SSRF. A compact bending mechanism is designed in order to get horizontally fo-cused high energy monochromatic X-ray as small as 0.5mm. The bender applies a piece of thin asymmetric crystal and a pair of leaf springs which push the crystal to a sagittally bent radius as small as 1 meter by a pair of symmetry moments. An optimized crystal geometry is achieved by taking into account the meridional and sagit-tal bendings coupled and defined by the anisotropic elas-ticity of the asymmetric crystal. Furthermore, thermal slope error and structural stress of the bent crystal are analyzed by finite element method (FEA).

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE16

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paper received ※ 09 September 2016 paper accepted ※ 22 September 2016 issue date ※ 22 June 2017

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TUPE17

The development of CVD Diamond Based FEL Photon Stoppers in LCLSII

H. Wang, Y. Feng, J. Krzywiński, E. Ortiz, M. Rowen
SLAC, Menlo Park, California, USA

Safety stoppers are required to absorb and stop the LCLS-II Free-Electron Laser (FEL) beam, which has the unique combination of extremely high peak fluence per pulse and enormous average power density. This is unprecedented at the existing 3rd generation synchrotron or current 4th generation low repetition rate FEL source, so that new solutions are required. CVD diamond has been proposed as the absorber material, for its low Z number, high thermal conductivity and high thermal shock resistance. The Photon Stopper design consists of a perimeter cooled CVD diamond absorber, clamped in between two copper (OFHC) heat sinks, with one looped with a water cooling line. The thermal studies include both steady state and instantaneous analysis. Diamond damage test results using LCLS FEL beam will also be reported.

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TUPE44

Optimization for the APS-U Magnet Support Structure

254

Z. Liu, H. Cease, J.T. Collins, J. Nudell, C.A. Preissner
ANL, Argonne, Illinois, USA

Funding: Work supported by: Argonne is managed by UChicago Argonne, LLC, for the U.S. Department of Energy under contract DE-AC02-06CH11357.
The Advanced Photon Source Upgrade (APSU) is to replace the existing storage ring with a multi-bend achromats (MBA) accelerator lattice *. For the APS-U removal and installation, current planning calls for a 12-month shutdown and testing period, prior to resumption of operations. It calls for quick installation of the magnet support system with assembly and installation alignment tolerance. A three-point, semi-kinematic vertical mount for the magnet modules is the approach to reduce time for alignment. The longest section is the curved FODO section (four quads with three Q-bends interleaved, and a three-pole wiggler). All magnets of the FODO section sit on a single piece of support structure in order to have a good control over the magnet-to-magnet alignment tolerance. It brings challenge to minimize the top surface deflection and maximize the first mode frequency of the magnet support structure that is supported at three points. These constraints call for the need of optimizing the magnet support structures. Details of the optimization, including three-point positioning, material selection, and topology optimization, are reported in this study.
* Glenn Decker (2014) Design Study of an MBA Lattice for the Advanced Photon Source, Synchrotron Radiation News, 27:6, 13-17, DOI: 10.1080/08940886.2014.970932

Poster TUPE44 [1.889 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE44

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paper received ※ 07 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017

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WEAA02

X-Ray Absorber Design and Calculations for the EBS Storage Ring

257

F. Thomas, J.C. Biasci, D. Coulon, Y. Dabin, T. Ducoing, F. Ewald, E. Gagliardini, P. Marion
ESRF, Grenoble, France
F. Thomas
ILL, Grenoble, France

The Extremely Brilliant Source (EBS) of the ESRF will hold new type of X-Ray absorbers: a new material will be used (CuCr1Zr suggested by *) together with a novel design integrating: - CF flange are machined in the absorber body. No weld, no braze. - Optimized toothed surface profile, reducing the induced thermal stresses. - Compton and Rayleigh scattering integrated blocking shapes. - Concentric cooling channels. A brief overview of the new design and concepts will be given. The presentation will then focus on thermo-mechanical absorber ANSYS calculations, combining both Computational Fluid Mechanics (CFD). The calculations and the calculation process will be discussed as well as the design criteria chosen by the team. The CFD calculations will show that an heat transfer coefficient between the water and the copper part can be estimated as well as the pressure drop through the absorber. Finally, the stress analysis will be emphasized. The type of stresses (tensile, compressive or shear) and their nature (primary or secondary) will be linked to the choice of design criteria.
* S. Sharma, "A Novel Design of High Power Masks and Slits", Proc. of MEDSI2014, Australia (2014).

Slides WEAA02 [1.968 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEAA02

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paper received ※ 11 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017

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WEAA03

Thermal Stability of the New ESRF Extremely Brilliant Source

262

B. Tampigny, J.C. Biasci, J-F.B. Bouteille, Y. Dabin, M. Diot, L. Farvacque, F. Favier, A. Flaven-Bois, T. Marchial, D. Martin, P. Raimondi, P. Roux-Buisson
ESRF, Grenoble, France
F. Thomas
ILL, Grenoble, France

In the frame of the Extremely Brilliant Source project (EBS), studies dedicated to disturbances have been more intensively investigated. Engineering instabilities have two origins: mechanical and thermal. Major thermal issues are: - air conditioning presents a temperature ramp up of 2°C along the sector - storage ring requires a warm up period of 4 days for reaching a stable orbit These effects have been observed and corrected for 20 years. With EBS requirements, we need to identify these thermal effects in order to reduce the disturbances, thus improving more systematically the source stability. The study is lead by the comparison between the present and the new thermal system. To do so, it is necessary to evaluate the heat balance in this system, as well as to identify the thermal time constant of each component. FEA models have been performed to reveal sensitivity of these thermal issues. A full scale mock-up cell equipped with a prototype girder is measured with power cables inside. A FEA model was also developed for the present storage ring to analyse the air stream. Although investigations have already been developed, some others remain to be achieved by the end of 2016.

Slides WEAA03 [4.824 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEAA03

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paper received ※ 10 September 2016 paper accepted ※ 23 September 2016 issue date ※ 22 June 2017

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WEAA04

Novel Numerical Method for Calculating the Shadow Projection and Collisions of a Multi-Axis Goniometer at Diamond

267

V. Grama, A. Wagner
DLS, Oxfordshire, United Kingdom

Beamline I23 is a long-wavelength macromolecular crystallography beamline at Diamond Light Source. The end station is a unique instrument with a bespoke cryogenically cooled multi-axis goniometer and a large curved Pilatus 12M detector in a high vacuum environment. As experiments become limited by radiation damage to the crystals, optimised strategies are needed to orient crystals in the most efficient way to obtain a complete dataset with a minimal X-ray dose. Two key factors affect the optimisation strategies. Firstly, shadowing on the detector by the goniometer resulting in data loss in this region and secondly, collisions between the goniometer and other components in the end station restricting the available angular range for sample centering and data collection. This paper discusses the numerical methods for calculating the shadowing of a multi-axis goniometer on a semi-cylindrical detector and the calculation of the allowable angles for various conditions to prevent collisions with neighbouring components.

Slides WEAA04 [61.267 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEAA04

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paper received ※ 07 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017

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WEBA01

Nostradamus and the Synchrotron Engineer: Key Aspects of Predicting Accelerator Structural Response

272

C.A. Preissner, H. Cease, J.T. Collins, Z. Liu, J. Nudell
ANL, Argonne, Illinois, USA
B.N. Jensen
MAX IV Laboratory, Lund University, Lund, Sweden

Funding: Argonne is managed by UChicago Argonne, LLC, for the U.S. Department of Energy under contract DE-AC02-06CH11357.
MBA designs are placing stringent mechanical tolerances on the magnet support systems. At the APS-U the mag-net-to-magnet vibration tolerances are about 10 nm *. Timelines, installation requirements, and budgets constrain the resources available for prototyping and physical testing. Reliance on FEA to predict dynamic response is para-mount in insuring the tolerances are met. However, obtaining accurate results from a magnet support structure FEA is not as simple as analysing the CAD model of the structure. The 16th century author Nostradamus published a collection of prophecies that since his time, have been held up as predictions of various world events. While it is attractive to think his collection of short poems can be used to foretell the future, in reality it is only the vagueness and absence of any dates that make them easy to apply in a posthoc basis. Arguably, a similar statement can be made about the use of FEA in predicting accelerator support response. In this presentation the important contributors to FEA dynamic modelling will be discussed along with techniques that can be used to generate necessary data for models that can accurately predict response.
* APS-Upgrade, Functional Requirements Document, Advanced Photon Source, Argonne, IL, USA, APSU1695659, May 2016.

Slides WEBA01 [14.136 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEBA01

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paper received ※ 10 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017

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