Keyword: radiation
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TUPH02 Collimator for ESRF-EBS electron, SRF, storage-ring, shielding 23
 
  • J. Borrel, Y. Dabin, F. Ewald, P. Van Vaerenbergh
    ESRF, Grenoble, France
  
  The function of the collimator is to localize the majority of the electron losses in the ESRF-EBS storage ring (SR). In addition, the collimator of the ESRF-EBS should absorb about 1200w of synchrotron radiation. For ESRF-EBS, the electron losses due to intra bunch scattering (Touschek scattering) will be higher than in the current ESRF SR. To control the level of radiation outside the storage ring tunnel and the activation level of the vacuum chambers, it is more efficient to localize the electron losses and block the radiations at one place rather than reinforce all of the SR tunnel shielding. The poster will show how the design has taken into account all the diverse requirements from a safety, accelerator physics, thermo-mechanical and mechanical point of view.  
poster icon Poster TUPH02 [1.569 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH02  
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TUPH05 Design of a Radiation Tolerant, Indexing Profile Monitor for the LCLS Electron Beam electron, optics, vacuum, operation 33
 
  • A.G. Cedillos, R.C. Field
    SLAC, Menlo Park, California, USA
  
  Funding: Work was performed in support of the U.S. DOE, Office of Sci-ence, LCLS project, under contract DE-AC02-76SF00515.
The Linac Coherent Light Source (LCLS) electron beam can damage YAG:Ce scintillation screens. After one year of use, the existing profile monitor has diminished fluorescence of the screen. The decrease in performance has resulted in distorted beam images which can com-promise the acquired data. Scheduling a YAG screen replacement is difficult, resulting in weeks of diminished performance. We have developed a unique profile moni-tor that incorporates multiple YAG screens (Ø40 mm, 50 um thick) and methods to reduce device downtime. This device uses unique geometry to direct coherent optical transition radiation (COTR) away from the optical path, which preserves the high resolution beam image. We are presenting the operational requirements, device design and installed device operational results. 		 
poster icon Poster TUPH05 [2.024 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH05  
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TUPH08 Aluminium and Bimetallic Vacuum Chambers for the New ESRF Storage Ring (EBS) vacuum, SRF, storage-ring, dipole 36
 
  • F. Cianciosi, P.M. Brumund, L. Goirand
    ESRF, Grenoble, France
  
  The ESRF is proceeding with the design and procurement of its new low emittance storage ring EBS (Extremely Brilliant Source project). This completely new storage ring requires a new vacuum system including UHV chambers with complex shape and strict geometrical and dimensional tolerances. In order to meet these requirements we decided to build about half of the chambers in aluminum alloy machined from the bulk, the only technology permitting to respect the requirements. The result are 128 chambers, 2.5m long, built in alloy 2219 with Conflat flanges custom made from the chamber supplier by explosion bonding. The production phase is nearly finished, the produced chambers satisfy completely the expectations. A second generation of experimental aluminum chambers was designed as a substitution of some steel ones in order to solve same geometrical difficulties. These chambers are very complex as they have steel-aluminum junctions in the body in order to accommodate bellows and beam position monitor buttons. The delivery of the first prototype of this type of chamber is previewed for June 2018.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH08  
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TUPH11 Retractable Absorber (Mask) and White Beam Imager Diagnostic for Canted Straight Section insertion, photon, operation, alignment 45
 
  • J. Da Silva Castro, N. Béchu, C. Herbeaux, N. Hubert, N. Jobert, M. Labat, F. Lepage, A. Mary, K.T. Tavakoli
    SOLEIL, Gif-sur-Yvette, France
  
  At the SOLEIL synchrotron, as in other accelerators, two canted sources can coexist on the same straight section for space and economic reasons. For its two long beamlines (ANATOMIX source upstream and NANOSCOPIUM source downstream) SOLEIL has made the choice to equip one of his long straight section with two canted insertion devices capable to operate simultaneously. That implies to take into account the degradation risk management of equipment, due to radiation. As the beam power deposition from the upstream undulator can seriously degrade the downstream one, or even other equipment. To handle these risks, Soleil first designed and installed in 2016 a retractable vertical absorber between both insertions to protect the downstream source from the upstream one. In 2017, Soleil then designed and installed a white beam imager, redundant an existing photon beam monitor (XBPM), to verify the correct positioning / alignment of equipment and beams relative to each other. For the vertical absorber as for the white beam imager Soleil had to meet some interesting technological and manufacturing aspects that we propose to present in a poster.  
poster icon Poster TUPH11 [3.744 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH11  
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TUPH16 Hammerhead Support Design and Application at SSRF SRF, synchrotron, FEL, electron 60
 
  • F. Gao, R.B. Deng, Z. Jiang, S. Xiang, L. Yin
    SINAP, Shanghai, People's Republic of China
  • S.K. Sharma
    BNL, Upton, Long Island, New York, USA
  
  Electron beam stability is very important for Shanghai Synchrotron Radiation Facility(SSRF). One of the major players on beam stability is the vibration stability of magnet support systems. This paper describes several kinds of hammerhead magnet support prototypes with different structures, materials and ground fixation. Modal and response analyses of these prototypes are contrasted by finite-element analysis(FEA) and tests. The design can be applied to guide and improve the mechanical structures and the stability of magnet support systems at SSRF and other light source facilities.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH16  
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TUPH21 Design of Vertical and Horizontal Linear Flexure Stages for Beam Size Monitor System synchrotron-radiation, simulation, synchrotron, emittance 72
 
  • W.Y. Lai, H.C. Ho, K.H. Hsu, D.-G. Huang, C.K. Kuan, C.J. Lin, S.Y. Perng, T.C. Tseng, H.S. Wang
    NSRRC, Hsinchu, Taiwan
  
  Taiwan photon source is a third generation accelerator with low emittance and high brightness. The electric beam size is one of important parameters to indicate the stabil-ity and to measure the emittance and coupling of light source. The aperture size of beam slitter is a crucial part to calculate the value of beam size in the X-ray pine-hole system. In order to obtain the more precise result of beam size, the flexure mechanism on beam slitter is applied for the adjustment of the aperture. This paper shows that the design concept and the measurement of the beam size are obtained by the new adjustment system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH21  
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TUPH22 Study on Cooling Technology of the Superconducting Undulator at SSRF cryogenics, SRF, operation, undulator 75
 
  • Y. Liu, S. Sun, J. Wang, L. Wang, S.H. Wang
    SINAP, Shanghai, People's Republic of China
  
  A superconducting undulator (SCU) prototpye with the period of 16 mm and the magnetic gap of 9.5 mm has been designed and fabricated at the Shanghai Institute of Applied Physics(SINAP) since late 2013. A set of cooling system is designed to cool down cold masses. This paper presents the details of their design, calculation and test: 4 small cryogenic refrigerators are used as cold sources, and the superconducting coil and beam pipe are independently cooled down; The 4.2 K superconducting coil is mainly cooled by the liquid helium tube of the thermosyphon loop with evaporation and recondensation; The 10~20 K ultra-high vacuum beam tube is cooled by heat conduction. The main sources and mechanism of thermal loads for SCU were analyzed. And experimental test of cooling technology for SCU prototype had been performed, the feasibility of cooling scheme and the rationality of the cooling structure for the SINAP SCU prototype were verified. The cryogenic test and operation of the SCU doesn't require the input of liquid helium from the outside, and is not limited by the liquid helium source. This is the characteristic of SINAP's SCU cooling technology.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH22  
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TUPH24 Front End of Dual Imaging and Diffraction Beamline at Diamond Light Source wiggler, dipole, storage-ring, optics 81
 
  • X. Liu, R.K. Grant, N.P. Hammond, R.K. Rawcliffe
    DLS, Oxfordshire, United Kingdom
  
  The Dual Imaging and Diffraction (DIAD) beamline X-ray source is a ten pole mini wiggler. By locating the mini wiggler in place of an existing sextupole magnet, the DIAD beamline is built at a bending magnet beamline position in Diamond. To accommodate the unusual beam trajectory, a new front end was designed for the DIAD beamline. The particular designs and specifications including an improved front end slits design, as well as the synchrotron and dipole ray tracing of the front end are presented in this paper. The development process of delivering the front end - the project challenges, approach and activities are also described along with the technical challenges.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH24  
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TUPH26 A Quasi-Periodic Elliptically Polarized Undulator at the National Synchrotron Light Source II undulator, MMI, multipole, synchrotron 88
 
  • M. Musardo, P.L. Cappadoro, O.V. Chubar, T.M. Corwin, D.A. Harder, Y. Hidaka, J. Rank, T. Tanabe
    BNL, Upton, New York, USA
  • C.A. Kitegi
    SOLEIL, Gif-sur-Yvette, France
  
  Funding: Work supported by DOE under contract DE-SC0012704
A 2.8 m long quasi-periodic APPLE II type undulator has been commissioned at the National Synchrotron Light Source II (NSLS-II) for the Electron Spectro-Microscopy (ESM) beamline in the framework of the NEXT (NSLS-II Experimental Tools) project. It provides high brilliance photon beams in circularly and linearly polarized radiation from VUV to soft X-Rays. The mechanical structure implemented to achieve the quasi-periodicity in the magnetic field profile is described together with the optimization techniques utilized to correct the undesirable phase-dependent errors. The final magnetic results are presented as well as the spectral performance of the device. Although this EPU (Elliptically Polarizing Undulator) was procured as a turn-key device, the vendor was only responsible for the mechanical frame and the control system. Sorting and assembly of the magnet modules and the magnetic field tuning - Virtual Shimming and Magic Finger - were performed at the NSLS-II Magnetic Measurement Lab. 		 
poster icon Poster TUPH26 [2.507 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH26  
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TUPH35 Stainless Steel Vacuum Chambers for the EBS Storage Ring vacuum, SRF, storage-ring, synchrotron 118
 
  • P. Van Vaerenbergh, J.C. Biasci, D. Einfeld, L. Goirand, J. Léonardon, H.P. Marques, J. Pasquaud, K.B. Scheidt
    ESRF, Grenoble, France
  
  The upgrade of the ESRF (ESRF-EBS) is a highly challenging project in many respects. One major challenge is to manufacture vacuum chambers within extremely tight tolerances. Indeed the chamber envelope is constrained by the very limited space available between the beam stay clear and the magnets pole tips, requiring profile tolerances of just 500 um over the full length of the chamber for a width of 55 mm. An additional challenge is guaranteeing the perpendicularity (up to 0.75 mrad) between the CF flanges and the chamber body. While a design using discrete removable absorbers was chosen, one family of chambers contains a distributed absorber required to protect the insertion devices from 600 W of upstream dipole X-rays. Two companies have been selected to produce a total of 296 stainless steel chambers. Given the unusual tolerance requirements, the manufacturers have been obliged to adapt and develop their production techniques to overcome the challenges. During manufacture, vacuum leaks were discovered on some of the BPM buttons. This paper will also present the two techniques that ESRF has developed in order to prevent the integration of potentially leaking buttons.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH35  
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TUPH42 A Novel Attempt to Develop a Linear Polarization Adjustable Undulator Based on Magnetic Force Compensation Technology undulator, polarization, FEL, SRF 140
 
  • W. Zhang, Y. Zhu
    SINAP, Shanghai, People's Republic of China
  
  A linear polarization adjustable undulator is proposed in this paper. This undulator can reach 1.5T magnetic peak field with a period length 68mm and magnet length 4m. By adding two repulsive magnet arrays beside center array the magnetic force between girders can be reduced from 70kN to near zero. Such an approach can result in a significant reduction of the undulator volume, simplification of the strong back design and fabrication. By means of rotating through the center of undulator we can achieve magnetic field from vertical orientation to horizontal orientation. The linear polarization of radiation can be adjusted between zero and 90 degree  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-TUPH42  
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WEOAMA03 High-Accuracy Small Roll Angle Measurement Method Based on Dual-Grating Diffraction Heterodyne Interferometer laser, GUI, experiment, real-time 163
 
  • S. Tang, M. Li, H. Liang, W.F. Sheng, J. Yang
    IHEP, Beijing, People's Republic of China
  
  Funding: The work is supported by National Natural Science Foundation of China, NSFC (Grant No. 61505213).
Small roll angle (ROLL) is an crucial parameter for the motion performances of ultra-precision guide way often applied in fine mechanics and instruments of synchrotron radiation, such as long trace profiler (LTP). However, it is difficult to be measured by conventional methods including interferometer and autocollimator owing to their low sensitivities in axial direction. There is an orthogonal dilemma between measured direction and angular displacement plane for ROLL measurement. Therefore, a novel method based on dual-grating diffraction heterodyne interferometer is presented, which uses the combining scheme of diffraction grating and heterodyne interferometer to overcome the orthogonal problem. Moreover, the design of differential structure with dual-grating and grating interferometer instead of pure interferometer, is adopted to improve the practicability against the environment, e. g. air fluctuation, inconstant rotation center. It has inherited advantages of high-resolution up to 2nrad, high sampling rate up to 50kHz, and contactless by mathematical modeling and analysis. So, theoretcial and experimental verifications are both implemented to its validation. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOAMA03  
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WEOPMA06 A Compact and Calibratable von Hamos X-Ray Spectrometer Based on Two Full-Cylinder HAPG Mosaic Crystals for High-Resolution XES optics, GUI, experiment, FEL 189
 
  • I. Holfelder, B. Beckhoff, R. Fliegauf, Y. Kayser, M. Müller, M. Wansleben, J. Weser
    PTB, Berlin, Germany
  
  In high-resolution X-ray Emission Spectroscopy (XES) crystal-based Wavelength-Dispersive Spectrometers (WDS) are being applied for characterization of nano- and microscaled materials. Thereby the so called von Hamos geometry provides high detection efficiency due to sagittal focusing using cylindrically bent crystals. To maximize the detection efficiency a full-cylinder optic can be applied. A novel calibratable von Hamos X-ray spectrometer based on up to two full-cylinder optics was developed at the PTB. To realize the full-cylinder geometry Highly Annealed Pyrolytic Graphite (HAPG) [1] was used. Besides its good bending properties this mosaic crystal shows highly integrated reflectivity while offering low mosaicity ensuring high resolving power [2]. The spectrometer enables chemical speciation of elements in an energy range from 2.4 keV up to 18 keV. The design and commissioning of the spectrometer will be presented together with first results using synchrotron radiation as excitation source. The spectrometer combines high efficiency with high spectral resolution (ten times better than in commercial WDS systems) in a compact arrangement also suitable for laboratory arrangements.
[1] H. Legall et al. (2006). Proc. FEL, BESSY FRAAU04, 798-801
[2] M. Gerlach et al. (2015). J. Appl. Cryst. 48, 2015, 1381-1390
 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOPMA06  
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WEOPMA07 Development of a New Sub-4k ARPES Endstation at PSI ISOL, cryogenics, interface, synchrotron 193
 
  • D. Trutmann, S. Hasanaj, St. Maag, L. Nue, A. Pfister, P.N. Plumb, A. Schwarb, S. Shi, K.M. Zehnder
    PSI, Villigen PSI, Switzerland
  
  Funding: Swiss National Science Foundation (SNSF) project number 206021164016
In spring 2016 a project was started to renew the high-resolution ARPES endstation of the Surface/Interface Spectroscopy (SIS) beamline at PSI. The focus lay on achieving sample temperatures below 4 K while maintaining 6 degrees of freedom. This made it necessary to redesign all thermally active parts, such as the connection to the cryostat, the flexible braid that enables the tilt and azimuthal movement, the sample clamping as well as the thermal isolators that hold the clamping device in place. A newly introduced shield in the main analyser chamber, cooled by separate cryopumps, is used to remove nearly all radiation heat load. A major milestone has recently been taken, by running cryogenic tests on a test stand. The simplified setup reached sample temperatures of 3.35 K. The temperature loss from the cryostat to the sample was as low as 0.6 K. Encouraged by these results, it is believed that the final endstation will be able to reach temperatures even below 3 K. With the new cryo concept, the thermal performance seems to be mainly limited by the radiative heat load emitted by the analyser lens. The new endstation is planned to be in operation by spring 2019. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEOPMA07  
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WEPH01 Evaluation of Anisotropic Simulations & Redesign of the BXDS High Energy Monochromator Bent Laue Diffraction Crystal Holders focusing, simulation, instrumentation, wiggler 199
 
  • M.J.P. Adam, N. Appathurai
    CLS, Saskatoon, Saskatchewan, Canada
  
  The Brockhouse X-ray Diffraction and Scattering Sector (BXDS) High-Energy (HE) beamline includes a bent Laue diffraction monochromator. The BXDS HE monochromator achieves energy ranges of 35keV to 90 keV through the bent Laue diffraction of two silicon crystal wafers. Each wafer (460um & 1000um thick) is bent to achieve specific sagittal radius (Rs); subsequent anticlastic meridional radius (Rm) results from the anisotropic nature of silicon, creating the desired x-ray focusing parameters. During the initial conditioning of the BXDS HE monochromator spurious diffraction patterns were observed indicating that the crystal holder, and crystal integrity failed. Alternative holder designs were evaluated using Finite Element Analysis (FEA; ANSYS) simulations to ensure that appropriate Rs and Rm values were achieved, verification of the crystal holder Rs was completed using contact 3D measurement (FaroArm), and the crystal surface was assessed using 3D optical profiling (Zygo). A superior holder was chosen based on the results, and replaced. The performance of the BXDS HE monochromator has been characterized, indicating the new holder design has achieved x-ray focusing parameters.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH01  
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WEPH02 Thermomechanical Analysis of SESAME High-Heat-Load Front Ends Components wiggler, simulation, synchrotron, dipole 202
 
  • M.A. Al-Najdawi
    SESAME, Allan, Jordan
  
  New front end beamline components at SESAME* are designed to handle the high heat load produced by the insertion devices. A mini gap wiggler will be installed for the Material science Beamline and the front end will receive 5.0 kW of total power and 7.74 kW/mrad2 of peak power density. The power produced by the insertion device was simulated using SynRad+, this software is using Monte Carlo simulation to simulate the synchrotron radiation from either an insertion device or any magnet source, the surface power density distribution generated by this software mapped directly to an FEA software to conduct a coupled thermo-mechanical analsys. The design, modeling, power source simulation and FEA analysis of the fixed mask, shutter and filter for the material science Beamline front end will be presented in this paper
Synchrotron-light for Experimental Science and Applications in the Middle East 		 
poster icon Poster WEPH02 [0.939 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH02  
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WEPH07 Photon Beam Applied as Heat Flux on Irregular Surfaces in FEA photon, software, operation, simulation 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 icon Poster WEPH07 [0.636 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH07  
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WEPH08 Application of Remote Installation and Measurement Smart Vehicle in Accelerator alignment, monitoring, controls, operation 217
 
  • J.X. Chen, H.Y. He, C.J. Ning, A.X. Wang, Y.J. Yu, J.S. Zhang, D.H. Zhu
    CSNS, Guangdong Province, People's Republic of China
  • L. Kang, L. Liu, X.J. Nie, G.Y. Wang, J.B. Yu
    IHEP, Beijing, People's Republic of China
  
  Funding: National Natural Science Foundation of China, No.11375217
The installation, alignment measurement and vibration monitoring of the accelerator equipment are cumbersome. In order to reduce the work intensity and exposure time of personnel, this paper has developed a smart vehicle that can automatically walk and automatically adjust the horizontal in the accelerator or beam line area. The smart vehicle can move forwards, sideways, oblique lines, rotations and combinations, and can automatically adjust the level according to different terrains. The auto-leveling accuracy is better than 0.001 degrees. By installing vibration measuring equipment or collimating equipment on the vehicle platform, vibration testing and collimation measurement of the equipment in the accelerator or beamline device can be performed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH08  
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WEPH09 Vibrational Stability of a Cryocooled Double Crystal Monochromator at SSRF SRF, experiment, laser, synchrotron-radiation 220
 
  • Y. Fan, H.L. Qin
    SSRF, Shanghai, People's Republic of China
  • Z. L. Li, F. Tao, W. Zhu
    SINAP, Shanghai, People's Republic of China
  
  There is an increasingly critical demand on the angular stability of double crystal monochromator (DCM). This work focuses on a method to measure angular vibration directly at the DCM crystals using a dual-frequency interferometer. This method was applied to the off-line test of a newly developed cryocooled DCM at Shanghai Syn-chrotron Radiation Facility (SSRF), which can obtain a resolution of 8 nrad. The DCM was then tested on the X-ray Test Line. Both off-line and on-line results were referenced for DCM structure optimizations. In this paper, the DCM angular stability measuring method is presented, and detailed information of the results are shown.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH09  
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WEPH13 Vibration Monitoring at TPS Storage Ring storage-ring, monitoring, status, LabView 227
 
  • K.H. Hsu, C.K. Kuan, W.Y. Lai, H.S. Wang
    NSRRC, Hsinchu, Taiwan
  
  In order to locate irregular vibrations caused by the installation of new equipment or malfunctioning of the machine, a vibration monitoring system was developed for the storage ring. Totally, 72 accelerometers and 10 velocity sensors were used to detect girder and ground vibrations, respectively. Continuous long-time observation results will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH13  
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WEPH14 Optomechanical Optimization for a Sagittaly Bent Double Crystal Monochromator, Using Finite Elements and Ray Tracing photon, focusing, synchrotron, software 231
 
  • N. Jobert, E. Fonda, T. Moreno, M. Ribbens
    SOLEIL, Gif-sur-Yvette, France
  
  Designing a second crystal for a sagittally bent Double Crystal Monochromator (DCM) requires dealing with a number of conflicting requirements. Especially when working with high-energy photons, the angular aperture (Darwin width) becomes very narrow (below 10µrad for Si) while simultaneously the bending radius is increasing small (down to 1m for typical beamline dimensions at 40keV). In this situation, the cross-talk between tangential and sagittal curvature becomes a key parameter, and two strategies are generally used to overcome the issue: either using a flat crystal with a specific length/with ratio, or usage of a rib-stiffened crystal. In the frame of the upgrade of the SAMBA beamline DCM, both solutions have been explored, using a suite of scripts connecting a general purpose FEM code (ANSYS) and a ray-tracing code (SpotX). This has allowed a systematic evaluation of a wide number of configurations, giving insight in the interaction between geometric parameters, and ultimately resulting in a twofold increase in the photon throughput at 30keV without comprising neither spectral resolution nor spot size at sample location.  
poster icon Poster WEPH14 [3.378 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH14  
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WEPH23 FEA Simulations of the Aluminium Vacuum Chamber for LOREA Insertion Device at ALBA Synchrotron Light Source vacuum, distributed, alignment, dipole 255
 
  • M. Quispe, A.A. Gevorgyan
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  
  For LOREA, the new beamline at ALBA, the Insertion Device Apple-II helical out-vacuum undulator requires the installation of a suitable narrow-gap aluminium chamber. The chamber design is based on the standard ALBA aluminium chamber which has an internal elliptical cross section, where NEG coating is deposited and bending magnet (BM) radiation from the upstream dipole is dissipated on the chamber walls. For the standard chamber the upstream distributed absorber cannot protect the entire chamber from direct BM radiation because there is a limitation for its design: the beam impedance of the machine. Based on new studies of collective effects it has been concluded that it's possible to implement modifications on the upstream distributed absorber and protect the chamber from lateral collision of BM radiation keeping the beam impedance of the machine inside of a safe range. In spite of that still there is a contribution of the tails of BM radiation. In this paper we describe the behavior of the new aluminium vacuum chamber for different thermal load conditions using water and air for refrigeration. Also we present the design of the modified OFHC upstream distributed absorber.  
poster icon Poster WEPH23 [0.609 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH23  
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WEPH24 Design of an Integrated Crotch Absorber for ALBA Synchrotron Light Source dipole, photon, vacuum, undulator 258
 
  • M. Quispe, J. Campmany, A.A. Gevorgyan, J. Marcos
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  
  This paper presents the design of an Integrated Crotch Absorber for the new beamline LOREA (Low-Energy Ultra-High-Resolution Angular Photoemission for Complex Materials at ALBA). The LOREA Insertion Device (ID) consists of an Apple II undulator with a period of 125 mm. For the current ALBA dipole chamber the ID vertical polarized light hits the upper and lower walls because of the very narrow vertical aperture between the cooling channels. To solve this problem some modifications must be implemented both in the dipole chamber and in the crotch absorber located inside of the dipole. The new crotch absorber, named Integrated Crotch Absorber, must absorb a significant part of the ID vertical polarized light in order to avoid radiation impinging at the post dipole chamber. The geometry of the Integrated Crotch Absorber is a combination of the conventional crotch and the distributed absorber done at PSI for ANKA. The design has been optimized taking into account the standard thermo-mechanical design criteria as well as the reflective effects of the ID radiation from the opening towards the walls of the dipole chamber.  
poster icon Poster WEPH24 [1.046 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH24  
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WEPH28 A Note of Thermal Analysis in Synchrotron Radiation Accelerator Engineering synchrotron, synchrotron-radiation, insertion-device, undulator 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 icon Poster WEPH28 [0.390 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH28  
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WEPH31 Optimization Method Using Thermal and Mechanical Simulations for Sirius High-Stability Mirrors simulation, cryogenics, synchrotron, photon 273
 
  • L.M. Volpe, G.V. Claudiano, R.R. Geraldes, S.A.L. Luiz, A.C. Pinto
    LNLS, Campinas, Brazil
  
  Funding: Brazil's Ministry of Science, Technology, Innovation and Communication (MCTIC)
The mirrors for Sirius, the new 4th-generation synchrotron at the Brazilian Synchrotron Light Laboratory (LNLS), have strict requirements regarding thermo-mechanical stability and deformations, with figure height and slope errors limited to a few nanometers and tens of nanoradians, respectively. Therefore, fixed-shape mirrors have been defined with horizontally-reflecting orientation (except for vertically-reflecting mirrors of KB systems), whereas their cooling schemes (namely, air, water or liquid nitrogen cooling) depend on the particular power load. A thermal and mechanical optimization method was developed to guide the design of mirrors through the evaluation of deformations caused by power load, cooling, gravity, tightening of the fastening screws, manufacturing errors and modal analyses. Up to now, this method was already used to define the mirrors of Sirius' beamlines, which include plane, cylindrical, elliptical and ellipsoidal mirrors, as well as KB systems for microprobe and nanoprobe stations. Two examples are presented to illustrate the method. 		 
poster icon Poster WEPH31 [1.296 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH31  
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WEPH32 DESIGN OF A LAYERED HIGH PRECISION MAGNET GIRDER collimation, dipole, synchrotron, synchrotron-radiation 277
 
  • G.Y. Wang, L. Kang, J.B. Yu, J.S. Zhang
    IHEP, Beijing, People's Republic of China
  • J.X. Chen
    CSNS, Guangdong Province, People's Republic of China
  
  In order to adjust the collimation of the light source magnet, a layered magnet girder is developed, which can adjust the six degrees of freedom accurately and reduce the mutual influence of the adjustment process between the various layers of the girder. The precision of the collimation is up to 5 microns.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH32  
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WEPH38 Mechanical Design and Construction of the Coherent X-ray Scattering Beamline at Taiwan Photon Source vacuum, photon, focusing, scattering 286
 
  • H.Y. Yan, C.Y. Chang, C.H. Chang, S.H. Chang, C.Y. Chen, C.C. Chiu, L. Huang, Y.-S. Huang, L. Lee, J.M. Lin, D.G. Liu
    NSRRC, Hsinchu, Taiwan
  
  The Coherent X-ray Scattering (CXS) beamline at Taiwan Photon Source has been completely constructed in the end of 2015 and opened for users in the next half year of 2016 successfully. Two In-vacuum Undulators (IU22) with lengths of 3 m and 2 m were used as the Insertion Device (ID) to provide intense synchrotron radiation for the CXS beamline. To achieve the coherent performance, the setup of components in the beamline needs to be considered and designed carefully. As no white-beam diamond window was installed in the upstream beamline for the maintenance of coherent beam, a differential pumping mechanism was evaluated to prevent the worse vacuum condition influencing the front end and the storage ring. A single-crystal diamond filter was also adopted to maintain the coherence of x-ray. The protection of bremsstrahlung radiation for this beamline was designed specifically based on the optical layout. This paper will introduce the detailed mechanical design and current status for the CXS beamline.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-WEPH38  
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THOAMA01 Optimizing the PETRA IV Girder by Using Bio-Inspired Structures lattice, synchrotron, storage-ring, ECR 297
 
  • S. Andresen
    Alfred-Wegener-Institut, Bremerhaven, Germany
  
  The PETRA IV project at DESY (Deutsches Elektronen Synchrotron) aims at building a unique synchrotron light source to provide beams of hard X-rays with unprecedented coherence properties that can be focused to dimensions in the nanometer-regime. An optimization of the girder structure is necessary to reduce the impact of ambient vibrations on the particle beam. For this purpose, several numerical approaches have been made to simultaneously reach natural frequencies above 50 Hz, a high stiffness and a low mass. In order to define an optimal girder support, a parametric study was conducted varying both the number and location of support points. Based on the resulting arrangement of support points, topology optimizations were performed to achieve a high stiffness and a high first natural frequency. The following transformation of the results into parametric constructions allowed further parametric studies to find optimal geometry parameters leading to the aimed girder properties. In addition to that, bio-inspired structures based on marine organisms were applied to the girder which likewise resulted in improved girder properties.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA01  
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THOAMA04 Design and FEA of an Innovative Rotating Sic Filter for High-Energy X-Ray Beam simulation, interface, storage-ring, scattering 306
 
  • W. Tizzano, T. Connolley, S. Davies, M. Drakopoulos, G.E. Howell
    DLS, Oxfordshire, United Kingdom
  
  I12 is a high-energy imaging, diffraction and scattering beamline at Diamond. Its source is a superconducting wiggler with a power of approximately 9kW at 500 mA after the fixed front-end aperture; two permanent filters aim at reducing the power in photons below the operating range of the beamline of 50-150 keV, which accounts for about two-thirds of the total*. This paper focuses on the design and simulation process of the secondary permanent filter, a 4mm thick SiC disk. The first version of the filter was vulnerable to cracking due to thermally induced stress, so a new filter based on an innovative concept was proposed: a water-cooled shaft rotates, via a ceramic interface, the SiC disk; the disk operates up to 900 degrees C, and a copper absorber surrounding the filter dissipates the heat through radiation. We utilised analysis data following failure of an initial prototype to successfully model the heat flow using FEA. This model informed different iterations of the re-design of the assembly, addressing the issues identified. The operational temperature of the final product matches within a few degrees C the one predicted by the simulation.
*M. Drakopoulos et al., "I12: the Joint Engineering, Environment and Processing (JEEP) beamline at Diamond Light Source". 		 
slides icon 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 vacuum, storage-ring, lattice, photon 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 icon Slides THOAMA05 [6.832 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THOAMA05  
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THPH32 Dual Beam Visualizer - Intensity Monitor for Lucia Beamline at SOLEIL Synchrotron synchrotron, photon, diagnostics, optics 403
 
  • C. Menneglier, D.K. Desjardins, V. Pinty, D. Roy, D. Vantelon
    SOLEIL, Gif-sur-Yvette, France
  
  LUCIA is a micro-focused beamline (0.8 - 8 keV) dedicated to X-ray fluorescence and X-ray absorption spectroscopy at SOLEIL Synchrotron.* With its recent optical upgrade and photons flux increase, the three pink-beam diagnostics of the beamline have been upgraded to support a beam reaching 1013ph/s and 20 W/mm². This paper presents the thermomechanical study and the realization of new devices adapted to the current constraints of use, making possible to both visualize the shape of the pink beam and to measure its intensity simultaneously in the same compact device. The beam is visualized by a piece of Al2O3 - Cr ceramic, soldered to a copper heat sink, whose fluorescence image is visible in visible light with a suitable camera and optical system. The measurement of the photonic intensity is made by a polarized CVD diamond used as a photosensitive element, the current reading is made by a suitable low current amplifier. The design of this dual beam visualizer and intensity monitor, made by the SOLEIL detectors group with thermomechanical studies done by the Mechanical Design Office, will be presented in details. In-lab measurements will be also presented.
* D. Vantelon et al., The LUCIA beamline at SOLEIL, Journal of Synchrotron Radiation, vol 23 (part 2), pp 635-640, March 2016. doi:10.1107/S1600577516000746 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THPH32  
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THPH33 Direct LN2 Cooled Double Crystal Monochromator cryogenics, vacuum, wiggler, damping 406
 
  • T. Mochizuki, K. Akiyama, K. Endo, H. Hara, T. Ohsawa, J. Sonoyama, T. Tachibana, H. Takenaga, K. Tsubota
    TOYAMA Co., Ltd., Kanazawa, Japan
  • K. Attenkofer, E. Stavitski
    BNL, Upton, Long Island, New York, USA
  
  A liquid-nitrogen-cooled (LN) X-ray double crystal monochromator has been designed and built for the high power load damping wiggler beamline of the NSLS2. It was designed as the direct LN first crystal to dissipate the max heat load of 2 kW and the second is in-direct-braid LN. It is designed to operate for beam energy 5 to 36 keV with fixed exit beam mode, and for QEXAFS compatible with channel cut mode. It is designed to rotate the Bragg axis with using AC servo motor and achieve up to 10 Hz scan.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THPH33  
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THPH43 New Holder for Dual-Axis Cryo Soft X-Ray Tomography of Cells at the Mistral Beamline cryogenics, synchrotron, vacuum, shielding 427
 
  • R. Valcárcel, C. Colldelram, N. Gonzalez, E. Pereiro, A.J. Pérez-Berná, A. Sorrentino
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  
  A new dual-axis sample holder has been designed and built for the Transmission soft X-ray Microscope (TXM) at the MISTRAL beamline (ALBA Synchrotron) to perform cryo-soft X-ray tomography of cells with dual tilt configuration to reduce the missing wedge. The design, with restricted dimensions Ø7x30mm, enables using commercial Auto-Grid support rings that give rigidity to the sample grid handling. It consists of a guided miniature handle with a spring system that allows sample rotation by 90° around the beam axis inside vacuum and in cryogenic conditions by using the TXM sample loading robot keeping a rotation of ±65° at the sample stage. Two magnets fix the positions at 0° and 90°.The two tilt series can be collected consecutively and the use of Au fiducials permits combining both improving the final quality of the 3D reconstructions. In particular, cellular features hidden due to their orientation with respect to the axis of rotation become visible. The main frame is made in aluminium bronze to enhance the thermal conductivity and in addition, all the pieces have undergone an ion implantation treatment in order to reduce friction and improve the anti-seizure property of the parts.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THPH43  
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FROAMA07 ESRF Double Crystal Monochromator Prototype Project SRF, vacuum, controls, GUI 440
 
  • R. Baker, D. Baboulin, R. Barrett, P. Bernard, G. Berruyer, J. Bonnefoy, M. Brendike, P.M. Brumund, Y. Dabin, L. Ducotté, H. Gonzalez, G. Malandrino, P. Marion, O. Mathon, T. Roth, R. Tucoulou
    ESRF, Grenoble, France
  
  Spectroscopy beamlines at the ESRF are equipped with a generic model of double crystal monochromator, originally acquired in the 1990's. After over 15 years of continuous service, their conception, although pioneering 20 years ago, can no longer meet the challenge of present and future scientific goals in terms of position and angular stability, thermal stability, cooling system, vibration, control and feedback, particularly in view of the ESRF - EBS upgrade. Considering the above issues, a feasibility phase was launched to develop a prototype DCM dedicated to future spectroscopy applications at the ESRF. Specifications : derived from expected performance of the EBS upgrade and scientific objectives - are extremely challenging, especially in terms of mechanical and thermal stability and impose the adoption of several innovative design strategies. The prototype is currently in the assembly phase and tests of the complete system are planned before the end of 2018. An overview of the DCM prototype project will be given, including specifications, major design options implemented and various validated concepts. Current project status and first test results will also be presented.  
slides icon Slides FROAMA07 [24.528 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-FROAMA07  
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