THPPP —  Poster Session   (09-Nov-23   14:50—16:10)
Chair: P. He, IHEP, Beijing, People’s Republic of China
Paper Title Page
THPPP002 Analysis of Hazards in a Flammable Gas Experiment and Development of a Testing Regime for a Polypropylene Vacuum Window 270
 
  • S.O. Bundrock, B. Billinghurst, X.E. Lipresenter, D.M. Smith
    CLS, Saskatoon, Saskatchewan, Canada
  
  Far Infrared Spectroscopy (Far-IR) is a bend magnet infrared beamline at the Canadian Light Source. The beamline utilizes a gas cell loaded with experimental gas which light is bounced through and a spectrometer to measure the absorption of the gas. For an experiment at Far-IR utilizing methane and nitrogen at 100K temperatures, issues with icing and inconsistent absorption gradients were noted at the Polymethylpentene Rigid Plastic (TPX TM) window separating the cell filled with the flammable gas mixture from the vacuum of the spectrometer. The possibility of replacing the existing windows with new 50-micron thick polypropylene windows was investigated. Material properties were not available for polypropylene at the operating temperature of the experiment. Due to the hazardous nature of the gas being held back a hazard analysis was carried out to identify potential risks and mitigations for the change. Additionally, with material properties unavailable, a testing regime was established to ensure the polypropylene could survive in the experimental environment. The experiment was successfully completed using the modified window assemblies.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP002  
About • Received ※ 19 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 08 December 2023
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THPPP003 FEM Simulations for a High Heat Load Mirror 274
 
  • J. Seltmann, H. Geraissate, M. Hoesch
    DESY, Hamburg, Germany
  
  At the variable polarization XUV beamline P04 of PETRA III the first mirror is used to switch the beam between the two branches of the beamline. The heat load on this white beam mirror is dependent on the degree of polarization and the energy of the first harmonic of the synchrotron radiation. For this project the water cooled "notched" mirror approach by Khounsary* and Zhang et al.** has been evaluated with FEM simulations. These show promising results for linear horizontal (LH) polarization in which the heat load profile is aligned with the mirror length. For linear vertical (LV) polarization the heat load is concentrated in the mirror centre, which violates the basic concept of the "notched" mirror design and therefore the simulation results indicate only poor performance. To compensate for this a secondary cooling loop has been implemented and will be shown to improve the performance for the LV case significantly. Additionally, a new design approach is evaluated to reduce the peak temperatures of the mirror, which otherwise ranged at 140-180°C.
* Khounsary, A.M., Proc. SPIE 3773, X-Ray Opt. Des., (1999). 10.1117/12.370114
** Zhang, L. et al., J. Phys.: Conf. Ser. 425, 052029 (2013). 10.1088/1742-6596/425/5/052029.
 		 
poster icon Poster THPPP003 [1.369 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP003  
About • Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 28 May 2024
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THPPP005 Development of a Vacuum Chamber Disassembly and Assembly Handcart 277
 
  • X.J. Nie, J.X. Chen, H.Y. He, L. Liu, R.H. Liu, C.J. Ning, G.Y. Wang, J.B. Yu, Y.J. Yu, J.S. Zhang
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • L. Kang
    IHEP, Beijing, People’s Republic of China
  
  This paper developed a dedicated disassembly and assembly handcart for CSNS magnetic alloy cavity vacuum chamber. The optimal supporting section structure was determined by the use of ANSYS to analyze the strength of different sections. The stress situation of the handcart was improved by adding an extension rod at the end of the handcart. The installation position of the handcart was determined by the center position of the associated equipment. The development of the disassembly and assembly handcart structure was completed through structural optimization, disassembly and assembly process analysis, and positioning scheme design. The development of a handcart can improve the positioning accuracy of the vacuum chamber and prevent damage to the vacuum chamber during disassembly and assembly process.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP005  
About • Received ※ 24 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 18 November 2023
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THPPP007 Optimizing Indirect Cooling of a High Accuracy Surface Plane Mirror in Plane-Grating Monochromator 280
 
  • J. Chen, X.W. Du, M.H. Lin, Q.P. Wang, Z. Wang
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  Funding: This work is supported by the Chinese Academy of Science (CAS) and the Anhui province government for key techniques R&D of Hefei Advanced Light Facility.
For the cooling of the plane mirror in VIA-PGMs (var-iable-included-angle plane-grating monochromators), the top-side indirect cooling based on water is preferred for its advantages, such as cheaper, easier to use, smart notches, etc, when compared to the internal cooling. But it also arises challenges to control the RMS residual slope error of the mirror, whose requirement is less than 100 nano-radian. This requirement is even hard to fulfill, when combined with 1) the asymmetry thermal defor-mation on the meridian of the footprint area during the energy scanning, 2) the high heat load deduced by the synchrotron light and 3) the no obvious effects of the classical optimizations, such as increasing footprint size, cooling efficiency or adding smart notches. An effective way was found after numerous attempts, which is to make the footprint area far from the mirror¿s edge to reduce the asymmetry of the thermal deformation except for leading to a longer mirror. This paper will illustrate how the asymmetry affects the mirror¿s residual slope error and then, focus on the relationship among the asymmetry of cooling and the distance to provide a ref-erence for optical cooling. 		 
poster icon Poster THPPP007 [1.805 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP007  
About • Received ※ 26 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 04 March 2024
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THPPP008 Optimization of Thermal Deformation of a Horizontally Deflecting High-Heat-Load Mirror Based on eInGa Bath Cooling 283
 
  • J. Chen, X.W. Du, M.H. Lin, Q.P. Wang, Z. Wang
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  Funding: This work is supported by the Chinese Academy of Science (CAS) and the Anhui province government for key techniques R&D of Hefei Advanced Light Facility.
The synchrotron facility are developing towards higher brightness, lower divergence, narrower pulse, higher stability, etc. Therefore, the requirements of the first mirror of the beamline, who bear high-heat-load, were upgraded, and the performances of the mirror will be affected easily by other factors, such as flow induced vibration, clamping force, etc. Indirect water cooling based on eInGa bath is regarded as an effective mean to solve these thorny problems in designing of the first mirror cooling. However, for the case a horizontal de-flection mirror, the unilateral cooling method is usually adopted, resulting in some changes in the structure of the mirror. In this paper, a first mirror horizontally deflect-ing in Hefei advanced light source (HALF) are taken as examples to introduce the optimization method to achieve ultra-low meridian slope error of the first hori-zontal deflection mirror. The results show that this opti-mization method provides a rapid design mean to design the cooling scheme of the horizontally deflecting mirror based on the eInGa bath. 		 
poster icon Poster THPPP008 [2.901 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP008  
About • Received ※ 01 November 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 26 February 2024
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THPPP009 The Heat Load Calculation in the Grating-Based Beamline at Hefei Advanced Light Facility (HALF) 287
 
  • Z. Wang, J. Chen, X.W. Du, D. Feng, Q.P. Wang
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  Funding: This work is supported by the Chinese Academy of Science (CAS) and the Anhui province government for key techniques R&D of Hefei diffraction limited light source.
For the 4th generation synchrotron radiation (SR) light source, the heat load causes severe thermal deformation on the beamline optics as the emittance is reaching at the physical limit. The precise calculation of heat load on the optical elements is important for the thermal analysis including cooling method and thermal deformation simulation. A heat load calculation code has been developed for grating based SR beamline optics, which consists of modules of SR source simulation, mirror reflectivity and grating efficiency. The calculation results has been checked with SRCalc results. This code has been used to calculate the heat load of the Test Beamline optics at Hefei Advanced Light Facility (HALF). The heat absorbed by the first three optical elements¿including a toroidal mirror, a plane mirror and a plane grating¿is calculated.
[1]R. Reininger. SRCalc (2001). Unpublished
[2]L. Rebuffi, et.el., J. Synchrotron Radiat. 27: 1108-1120 (2020).
[3]Z. Sun, et.al., The Innovation, 4 (6), 100514 (2023). 		 
poster icon Poster THPPP009 [1.853 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP009  
About • Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 09 January 2024
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THPPP010 Mechanical Analysis and Tests of Austenitic Stainless Steel Bolts for Beamline Flange Connection 290
 
  • T.T. Zhen, H.X. Deng, R. Deng, F. Gao, L.J. Lu, S. Sun
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  
  Cryogenic tests of 1.3GHz superconducting accelerator cryomodule for the Shanghai Hard X-ray Free Electron Laser Installation Project(SHINE) are in progress. For better performance, a study of mechanical analysis and tests of austenitic stainless steel bolts for beamline flange connection has been done in preliminary work. In order to satisfy the residual magnetism and strength, high-strength austenitic stainless steel bolts are selected. For higher sealing performance, the torque coefficient is determined by compression test, the lower limit of yield of the bolts is obtained by tensile test, then the maximum torque applied to the bolts under real working conditions can be obtained according to the relationship between preload and torque. A finite element model is established to get the deformation curve of the gasket, and the measured results of gasket thickness are compared to ensure the reliability of the simulation. The deformation curve of the gasket is used to calculate the change of compression force under the temperature cycling load(cool down and warm-up). Finally, the results of residual magnetism show that the bolts have a negligible effect on magnetic field.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP010  
About • Received ※ 25 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 18 November 2023
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THPPP011
 Design and Simulation Optimization of Storage Ring Magnet Supports  
 
  • Q.Q. Huang, X.Y. Li, Z.L. Liu, T. Luo, J.X. Tang, Z. Yang
    Institute of Advanced Science Facilities, Shenzhen, People’s Republic of China
  
  Mechanical support is fundamental for the accelerator equipment, its stability ensures the operation of many components on-top in high performance, such as the magnets, vacuum chambers and beam diagnostics, and thus the entire light source. The high stability of mechanical support usually refers to low static deformation under normal working conditions and high first-order natural mode. Therefore, it is extremely important to optimize the mechanical support in these regards. This paper focus on the design and optimization of the mechanical supports for Shenzhen Innovation Light source Facility (SILF) with the help of SolidWorks and ANSYS software. The design and optimization processes are presented in detail. The optimized design of mechanical support is then combined with the magnets model with considering as much as possible the details to reflect the reality, so as to ensure the relevant physical requirements are fulfilled.  
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THPPP012 Shape Optimization Design of Monochromator Pre-mirror in FEL-1 at S{³}FEL 293
 
  • Z.M. Xu, C. Yang, W.Q. Zhang, Y.P. Zhong
    IASF, Shenzhen, Guangdong, People’s Republic of China
  
  For the monochromator pre-mirror in FEL-1 at S3FEL, the deformation induced by high heat load result in severe effects on the beam quality during its off-axis rotation. To meet the pre-mirror shape error requirement for X-ray coherent transport, an integra-tion of passive cooling and active heating systems for thermal management of the monochromator pre-mirror has been proposed, developed, and modelled. An ac-tive heating system with multiple electric heaters is adopted to compensate for the pre-mirror shape fur-ther. Finally, using MHCKF model, the optimization of multiple heat fluxes generated by all electric heaters was accomplished. The results show that the thermal management using passive cooling and active heat schemes is effective to obtain high-precision surface shape for the pre-mirror.  
poster icon Poster THPPP012 [0.772 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP012  
About • Received ※ 24 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 November 2023
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THPPP013 Studies on the Influences of Longitudinal Gradient Bending Magnet Fabrication Tolerances on the Field Quality for SILF Storage Ring 296
 
  • J. Zhu, D.H. Liang, Y. Shi, C.G. Wang, M. Zhang
    IASF, Shenzhen, Guangdong, People’s Republic of China
  
  The advanced storage ring of 4th generation synchrotron radiation facility, known as the diffraction-limited storage ring (DLSR), is based on multi-bend achromat (MBA) lattices, which enable an emittance reduction of one to two orders of magnitude pushing beyond the radiation brightness and coherence reached by the 3rd generation storage ring. The longitudinal gradient bending (LGB) magnets, with multiple magnetic field stages in beam line direction, are required in the DLSR to reduce the emittance. The permanent magnet based LGB magnets are selected for the Shenzhen Innovation Light-source Facility (SILF) due to the advantages of operation economy, compactness and stability compare to the electro-magnet. In this paper, the influences of typical LGB magnet fabrication tolerances on the field qualities are presented using a dedicated parameterized finite element (FE) model, such as the poles height and width tolerances, the pole tips parallelism (in different orientations) and etc. Meanwhile the influences of permanent magnets discreteness and the magnetic forces (between top and bottom pole tips) induced yoke deformation on the field qualities are studied and presented.  
poster icon Poster THPPP013 [0.599 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP013  
About • Received ※ 27 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 08 May 2024
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THPPP014 A Special-Shaped Copper Block Cooling Method for White Beam Mirrors Under Ultra-High Heat Loads* 299
 
  • J.Y. Liu, H. Qin, X.X. Yan
    IASF, Shenzhen, Guangdong, People’s Republic of China
  
  In order to fulfil the more stringent requirements of op-tical figure accuracy for cooled X-Ray mirrors imposed to high heat loads, especially from advanced insertion de-vices in the diffraction limited storage rings (DLSR), investigations on the cooling system for white beam mirrors are conducted in this paper. A special-shaped copper block (SSCB) cooling method is proposed, using eutectic indium-gallium alloy as heat transfer medium. The SSCB cooling technology can keep a 550mm-length mirror slope error of 0.2 ¿rad (RMS) under 230 W absorp-tion heat power, showing great advantages in the accura-cy and flexibility for thermal deformation minimization when compared with the traditional ones.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP014  
About • Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 06 November 2023 — Issued ※ 10 December 2023
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THPPP015 Mechanical Design of the Novel Precise Secondary Source Slits 303
 
  • X.X. Yan, Y.J. Gong, Z. Ji, J.Y. Liu, H. Qin
    IASF, Shenzhen, Guangdong, People’s Republic of China
  
  High-precision slits are extensively adopted in coherent or nano-focusing beamlines as the secondary source, which can accurately define or achieve a beam size at the micron or sub-micron scale, while maintaining high stability. This paper presents the design of a set of precise slits based on a flexure hinge mechanism, which enables a nano-scale resolution and a stroke of hundreds of microns simultaneously. The coarse or fine adjustment motion of each blade can be accomplished with or without a displacement amplification mechanism, which is driven by a piezo actuator. Furthermore, the kinematic and dynamics models are investigated through finite element analysis (FEA) and numerical analysis successively, yielding consistent results. The optimized slits system can provide a linear stroke of up to 400 um with a resolution of 10 nm both in horizontal and vertical directions, whose first Eigen frequency is 130 Hz.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP015  
About • Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 28 November 2023
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THPPP016 Numerical and Experimental Studies to Evaluate the Conservative Factor of the Convective Heat Transfer Coefficient Applied to the Design of Components in Particle Accelerators 306
 
  • M. Quispe, J.J. Casas, C. Colldelram, M. Sanchez
    ALBA-CELLS, Cerdanyola del Vallès, Spain
  • H. Bello
    La Romanica, Barberà del Vallès, Sabadell, Spain
  • R. Capdevila, M. Rabasa, G.A. Raush
    ESEIAAT, Terrassa, Spain
  • S. Grozavu
    Universidad Politecnica de Madrid, ETSI Aeronauticos, Madrid, Spain
  
  The fluid boundary condition applied to the design of components in Particle Accelerators is calculated as a global variable through experimental correlations coming from the literature. This variable, defined as the Convective Heat Transfer Coefficient, is obtained using the correlations of Dittus and Boelter (1930), Sieder and Tate (1936), Petukhov (1970), Gnielinski (1976), among others. Although the designs based on these correlations work properly, the hypothesis of the present study proposes that the effectiveness of these approximations is due to the existence of a significant and unknown conservative factor between the real phenomenon and the global variable. To quantify this conservative factor, this work presents research based on Computational Fluid Dynamics (CFD) and experimental studies. In particular, recent investigations carried out at ALBA confirm in a preliminary way our hypotheses for circular pipes under fully and non-fully developed flow conditions. The conclusions of this work indicate that we could dissipate the required heat with a flowrate lower than that obtained by applying the experimental correlations.  
poster icon Poster THPPP016 [1.419 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP016  
About • Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 12 March 2024
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THPPP017
 Beamline Components of Ultimate Stability and Precision  
 
  • W. Diete, A. Andrianov, A. Schacht, I. Schweizer, S. Szillat, C. Venkataraman, T. Waterstradt, U. Wiesemann
    AXILON AG, Huerth, Germany
  
  The continuous advances towards diffraction-limited synchrotron light sources and free electron laser facilities (FEL) require beamline components with ever-increasing optical and mechanical performance. Key aspects are the positional stability of the x-ray beam at the experiment and the quality of the installed optical elements. AXILON is a worldwide leading company providing state-of-the-art beamline equipment for high-end beamlines. In this poster we provide an overview of our recent achievements for beamline components. Results of our newest generation of cryo-cooled monochromators demonstrate ultimate performance achieving beam stabilities well below 50 nrad. Latest mirror systems, including mechanical benders, also achieve similar beam stabilities with the bending mechanism preserving the mirror quality with slope errors below 100nrad rms, even when bent to the final elliptical shape. Finally, we give an update on our achievements with X-ray microscopes providing design concepts and first test results of a new microscope for ptychography, with a targeted positioning stability of 1-2nm.  
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THPPP018
 Delta Robot 2.0: The Nano-Positioning System for the Hard X-ray Nanoprobe at the Australian Synchrotron.  
 
  • M. Semeraro, N. Afshar, C.M. Kewish, J. McKinlay, C. Morey, M.D. de Jonge
    AS - ANSTO, Clayton, Australia
  • J.H. Kelly
    DLS, Oxfordshire, United Kingdom
  
  A nano-positioning system for the Nanoprobe beamline at the ANSTO Australian Synchrotron has been designed in collaboration with Diamond Light Source (DLS). Based on the DLS I14 delta robot [1], this design extends the bandwidth and uses an interferometer arrangement that reduces Abbe errors to improve positioning stability at high scan rate. Voice coil actuators and advanced control algorithms target precise and stable scanning with 3¿mm range in XYZ with 10 nm-rms stability; a significant challenge that was used to upskill in mechatronics engineering across our facility and improve design collaboration between mechanical and controls engineering groups. In addition to scanning, 360° rotation and 50¿mm focusing, and automated sample exchange are supported. The design, fabrication, and construction of the system is discussed, with preliminary results demonstrating its performance in terms of positioning accuracy, stability, and repeatability. This work represents an advance in the development of nanoprobe positioning systems for X-ray microscopy, with promising outlook for a range of scientific and engineering applications.
[1] J. Kelly, et al. Rev. Sci. Instrum. 92(4), 043712 (2022) 		 
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THPPP020 The Pre-alignment of High Energy Photon Source Storage Ring 310
 
  • S. Lu, L. Dong, L.L. Men, X.L. Wang
    IHEP, Beijing, People’s Republic of China
  • J. Liang, T. Wang
    DNSC, Dongguan, People’s Republic of China
  
  In order to achieve 10 micrometer pre-alignment accuracy of storage ring in transverse and vertical, four laser trackers were used for set up a four-station multilateration measurement system. Experiment results show that the relative displacement measurement accuracy is better than 3 micrometer in 3-meter workpiece range, which can satisfy the real-time position feedback accuracy of the magnets in the process of ultra-high-precision pre-alignment. After two years of research and development, three pre-alignment standard workstations have been established. And the laser multilateration measurement method is adopted to the pre-alignment of the three, five and eight magnet girders in the storage ring of HEPS. Currently, 240 out of 288 girders have been pre-aligned after half a year of work.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP020  
About • Received ※ 07 November 2023 — Revised ※ 08 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 03 December 2023
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THPPP021
 Ultra-Stable and Multi-DOF Bent KB Mirror Mechanical System for Hard X-Ray High Energy Resolution Spectroscopy (HX-HERS) Beamline of HEPS  
 
  • R.Z. Xu, M. Li, W.F. Sheng, S. Tang, H.H. Yu
    IHEP, Beijing, People’s Republic of China
  
  The KB mirror system designed for the HX-HERS beamline was expected to focus the spot size down to 2¿m×2¿m and achieve 5-DOF adjustment of each mirror. However, the long mirror length leaded large size of the overall mechanism and the limited height space for multi-dimensional adjustment makes the mechanical design of the KB system with both stability and functionality difficult. In this KB system, each mirror is bent by a four-bar bender universally used in HEPS to obtain the required profile. A combination of parallel and serial mechanism with totally 11-DOF is designed to realize the adjustment requirements. Specifically, the parallel mechanism is a three-point support design that serves as the base of the KB mirror chamber and offers coarse tuning of 5-DOF, exhibiting great compactness and high stiffness. The series mechanism is a stacking of four angle and two displacement adjustment mechanisms up to 6-DOF. These independent stages with high resolution are assigned to VFM and HFM respectively to achieve fine adjustment of their relative positions. In the design of each angle and displacement adjustment stage, the height and rigidity of the mechanism are also fully considered.  
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THPPP022
 A compact direct measurement method for relative positioning of KB mirrors nano-experimental apparatus based on grating interferometers  
 
  • S. Tang, T. He, M. Li, R.Y. Liao, Z.N. Ou, W.F. Sheng, Y. Tao, H.H. Yu, L. Zhou
    IHEP, Beijing, People’s Republic of China
  • T. He
    University of Chinese Academy of Sciences, Beijing, People’s Republic of China
  • H.H. Yu
    UCAS, Beijing, People’s Republic of China
  
  Funding: This work is supported by the project of High Energy Photon Source (HEPS).
Positioning measurement is regraded as an effective way for the position compensation and feedback of nano-experimental apparatus. However, it usually suffers many restrictions from the complicated applied occasion of a typical performance beamline for next-generation synchrotron radiation light source. To deal with the problem, a compact direct measurement method based on grating interferometers is presented. The principle, configuration, experiment are designed and implemented for the verification of the feasibility. It performs a high resolution in orthogonal/lateral direction relative to laser beam, which can overcome an infeasible shortage of a typical interferometer for direct lateral positioning. So, it is used for positioning measurement & compensation between KB mirrors and nano-stages of a sample for the experiments of CDI, bragg-CDI, pytchograph, XPCS, etc. Compared with the existed methods, huge frame, two vacuum chambers restriction, multi-axis interferometer and benchmark relay are avoided for the compact system by using proposed method. 		 
poster icon Poster THPPP022 [2.006 MB]  
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THPPP023 Design and Test of a New Crystal Assembly for a Double Crystal Monochromator 313
 
  • Y. Yang, H. Liang, Z.K. Liu, Y.S. Lu, D.S. Shen, L. Zhang, S. Zhang, Y.S. Zhang
    IHEP, Beijing, People’s Republic of China
  
  Vertical diffraction monochromator is a typical optical device in synchrotron radiation device. Its main requirements and characteristics are high Angle accuracy and stability. Due to the high requirements of new light sources, high precision and high stability have become a common difficulty. This paper mainly introduces the design and test of an internal crystal module of HDCM. There are two main parts: the first crystal and the second crystal. The first crystal assembly includes crystal cooling and clamping, using microchannel edge cooling and flat plate clamping schemes. The second crystal component, through the motor to the top, drives the flexible hinge, and then realizes the rotation of the crystal. At the same time, the Angle monitoring system is designed. The design scheme is verified by processing. The shape of the clamping surface of a crystal component meets the requirements of use. The motion test of the two crystal components is carried out in the atmosphere, vacuum and low temperature vacuum environment, and the results are much higher than the required parameters. And the whole stability is tested. It has high stability.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP023  
About • Received ※ 02 November 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 19 December 2023
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THPPP024
 Fast Setup Alignment of a Highly Mobile Experiment with a Raspberry Pi and a Beckhoff PLC and the Combination of the PLC to the DAQ.  
 
  • F. Scholz
    DESY, Hamburg, Germany
  
  The so-called Focus-Finder Setup of DESY uses a Beckhoff PLC to control the scanning motor during the measurement. While the measurement isrunning, the external trigger of a camera is used to save the timestamp and encoder value internally in the Beckhoff. Later, this data is used to synchronize the taken pictures with the corresponding encoder position. In our new enhanced setup, we use the Beckhoff PLC also for controlling all the additional motor axes of the experiment to align the scanning motion axis with the beam path. This is done by using a 7-inch touchscreen with an attached Raspberry Pi 3+ and pyqt5-based software to create the GUI. Together, this helps to reduce the setup and alignment time by factors.  
poster icon Poster THPPP024 [2.057 MB]  
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THPPP025
 Commissioning of the Intermediate Focus Setup at P04 at DESY  
 
  • F. Scholz, M. Hoesch, M.-J. Huang
    DESY, Hamburg, Germany
  • J. Buck, M. Kalläne
    CAU, Kiel, Germany
  • B. Pfau, M. Schneider
    MBI, Berlin, Germany
  
  The soft x-ray beamline P04 at PETRA III includes an experiment and beam-diagnostic station called Intermediate Focus (IF). The station holds an experimental station for soft x-ray scattering, as well as diagnostic and beam shaping equipment to propagate the beam further into the ASPHERE III setup of the University of Kiel (CAU). The IF station receives the beam over a pair of Kirkpatrick-Baez (KB) mirrors that produce 40 µm x 40 µm beam spot at the IF position. An additional set of KB mirrors inside the ASPHERE III instrument refocuses this spot into the ultimate focus. Among the beam shaping equipment, a set of interchangeable pinhole serve as a new source point. With a size between 5-100 µm they will produce a sub-micron beam size, which is less than 1 µm x 1 µm at the sample position. The IF station includes two features that will be presented: (a) A UHV switchyard that allows to bring either the scattering instrument or the beam shaper into the beam (collaboration with Max-Born-Institute Berlin). The switch between the setups works without breaking the vacuum. (b) The beam diagnostic and shaping assembly, including measurement and viewing components.  
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THPPP026 Motorized Universal Adjustment Platform for Micrometric Adjustment of Accelerator Components 316
 
  • M.N. Noir, D.B. Baillard, P.B. Biedrawa, L. Gentini, J.W. Jasonek, F.-X. Nuiry, V. Rude, R. Seidenbinder, M. Sosin, K. Widuch
    CERN, Meyrin, Switzerland
  • P.B. Biedrawa, J.W. Jasonek
    AGH University of Science and Technology, Kraków, Poland
  • A. Gothe
    Aarhus University, Aarhus, Denmark
  
  In order to optimize alignment activities in a highly radioactive environment, the Geodetic Metrology Group at CERN has developed a standardized featuring 6 degree of freedom (DoF) Universal Adjustment Platform (UAP). After a first prototyping phase in 2021 with a manual UAP, the design has been consolidated and is now compatible with the installation of motorized actuators to form a remotely adjustable 5-6 DoF platform able to perform positioning with micrometre resolution. This paper presents the UAP and related motorized actuator development, elaborated in the frame of the High-Luminosity Large Hadron Collider project. The mechanical integration approach, design solutions, and test results are discussed.  
poster icon Poster THPPP026 [1.494 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP026  
About • Received ※ 26 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 28 November 2023
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THPPP027
 The Diminishing Effect of Increasing First Natural Frequency on the Real World Stability of Mirror Systems  
 
  • E.R. Jane, L. Mateos
    FMB Oxford, Oxford, United Kingdom
  
  The drive to ever higher stability mirror systems for x-ray beamlines is of utmost importance to exploit the full potential of smaller, coherent 4th generation sources and advancements in optical polishing. Mirrors are rarely used dynamically during beam operation and as such they can be treated as static systems. Therefore, above the determined value from each facilities floor spectrum, the vibration amplitude becomes negligible. Extensive factory testing has shown, above a threshold value, there is no correlation between the actual vibrational stability of systems and their first natural frequencies. Furthermore, water cooled systems typically do not lead to increased 1st natural frequency, even though marginal increases in vibration are experienced. It is also shown utilization of coupled optical geometry provides the lowest vibrational performance. Therefore, does the trend of increasing the specification of the 1st natural frequency provide a cost effective and functional approach to real-world optical system design? Or should a holistic approach involving beamline design, optical layout and manual alignment techniques be used to realize ultimate vibrational performance?  
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THPPP028 Design and Analysis of CSNS-II Primary Stripper Foil 319
 
  • J.X. Chen, Y.J. Yu, J.S. Zhang
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • L. Kang, L. Liu, G.Y. Wang, J.B. Yu, J.Y. Zhangpresenter
    IHEP, Beijing, People’s Republic of China
  
  Funding: National Natural Science Foundation of China, 11975253
Stripper foil is a key equipment for converting negative hydrogen ions into protons in the RCS injection zone of CSNS. The structure of the CSNS primary stripper foil adopts a rotating steel strip structure, and the replacement time of the foil is long, requiring operators to carry out maintenance work in close proximity for a long time. The energy of CSNS-II injection beam has significantly increased from 80MeV to 300MeV, and the radiation dose in the injection area will also increase, making it impossible to maintain the equipment in close proximity for a long time. Therefore, it is necessary to redesign the primary stripper foil. This article will analyze the stripper efficiency and beam injection thermodynamics of CSNS-II stripper foil, carry out automatic foil store replacement structure design, motion analysis, and prototype testing, and envision remote maintenance solutions to achieve maintenance and repair of the stripper foil with minimal human intervention. 		 
poster icon Poster THPPP028 [3.748 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP028  
About • Received ※ 31 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 04 March 2024
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THPPP029 Technologies Concerning Metal Seals of the UHV System for Accelerators 322
 
  • H.Y. He, Y.S. Mapresenter
    IHEP, Beijing, People’s Republic of China
  • L. Liu, P.C. Wang
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • B. Tan
    Institute of High Energy Physics, CAS, Guangdong, People’s Republic of China
  
  Reviewed the domestic research on structural design and sealing function principle of the metal seals, wildly used in the Ultra High Vacuum (UHV) system for accelerators. Analyzed and summarized the key technologies concerning the material, contact forms, machining process and test methods of sealing performance. The study will become the basis of designing, machining and quality measuring for the ultra-vacuum metal seals. It provided the foundation for generating seals standards to promote the development of vacuum technology application.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP029  
About • Received ※ 27 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 26 November 2023
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THPPP032
 Automatic Collimation Device For A Long coil Magnet Measurement System  
 
  • R. Liang, F.S. Chen, Q. Li
    IHEP, Beijing, People’s Republic of China
  
  The automatic collimation device is designed for a long coil magnet measurement system. The device is able to automatically collimate dipole magnets before the magnetic measurement. During the automatic collimation, the magnetic center position and center plane of the long coil on the magnetic measurement system is coincided, and relative coordinates of the magnet on X-direction is also confirmed, which determines moving distance the long coil. Traditional collimation method is based on a collimator and a theodolite manually, which requires two specialists and long operation time. While the automatic device is designed to eliminates flaws above. The automatic collimation device possesses an automatic bracket for supporting and moving the measured magnet, a measurement instrument on a 7-DOFs manipulator, and a control system for the device. The automatic collimation follows such process that firstly, the measured magnet is put on the automatic bracket, secondly the measurement instrument determines error between center planes of the long coil and the measured magnet, then the automatic bracket corrects posture of the magnet automatically.
automatic collimation, magnet Measurement, manipulator 		 
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THPPP033
 Design of Ultra-Stable and Multi-DOF Generic Mirror Mechanical System at High Energy Photon Source (HEPS)  
 
  • L.H. Ma, M. Li, W.F. Sheng, S. Tang, J.Y. Wang
    IHEP, Bejing, People’s Republic of China
  • M. Li, W.F. Sheng
    University of Chinese Academy of Sciences, Beijing, People’s Republic of China
  • S. Tang
    UCAS, Beijing, People’s Republic of China
  
  The main function of the generic mirror chamber system in HEPS is to support, adjust the pose and provide the ultra-high vacuum environment of the optical elements in the beamline. Its pose adjustment requires micrometer or submicroradian level repetitive positioning accuracy and adjustment resolution. The white beam bending mirror chamber in the generic mirror chamber system of the Hard X-ray Nanoprobe Multimodal Imaging Beamline(B2) is taken as an example, to discuss the design of its pose adjustment mechanism. It needs to achieve 5-DOF for pose adjustment function. This paper proposes using a multi-layer marble structure and a combination of multiple motion mechanisms to achieve this function. The motor and screw-nut pair drive sliders can achieve 2-DOF adjustment. The motor and screw-nut pair drive two wedge-shaped blocks can achieve 2-DOF adjustment. The motor and straight circular flexible hinge drive a disc-type flexible hinge can achieve one angle adjustment. Finally, through series of numerical calculations, finite element simulations and physical experiments, it is demonstrated that the design indexes meet the requirements, thus verifying the feasibility of the scheme.  
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THPPP034
 Research on the Identification Method of Micro-Vibration Harmonic Signal Based on Kurtosis  
 
  • R.H. Liu, G.Y. Wang
    Institute of High Energy Physics, CAS, Guangdong, People’s Republic of China
  • L. Kang
    IHEP, Beijing, People’s Republic of China
  • L. Liu, J.S. Zhang
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  Large synchrotron radiation equipment works in complex microvibration environment which includes random vibration and periodic harmonic vibration signals. The harmonic signal will affect the identification of the working mode of the structure, and the identification of the harmonic signal can be used as the identification of the micro-vibration source. In this paper, according to the difference between the statistical characteristics of the system response and the harmonic response, a kurtosis value method based on random variable is applied to identify the harmonic response. The effectiveness of the method is verified by the simulation and the vibration data results of Shenzhen Sager Tower, which provides a new method for eliminating the influence of harmonic response in the following working modal parameter identification and vibration source identification of synchrotron radiation device.
Microvibration, Kurtosis value, Harmonic excitation, Modal parameter identification 		 
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THPPP035 Mechanical System of the U26 Undulator Prototype for SHINE 325
 
  • S.W. Xiang, H.X. Deng, R. Deng, Z.Q. Jiang, Y.Y. Lei, J.Y. Yang, W. Zhang, T.T. Zhen, S.D. Zhou
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  
  The Shanghai High repetition rate XFEL and Extreme light facility (SHINE) is under construction and aims at generating X-rays between 0.4 and 25 keV with three FEL beamlines at repetition rates of up to 1 MHz[1-3]. The three undulator lines of the SHINE are referred to as the FEL-I, FEL-II, and FEL-III. Shanghai Synchrotron Radiation Facility(SSRF) will manufacture a total of 42 undulators (U26) with a period length of 26mm for FEL-I and 22 undulators (U55) with a period length of 55mm for FEL-II. Both the U26 and U55 are 4m long and use a common mechanical system. By using the specially designed double lever compensation springs can eliminate different magnetic force on the drive units. A U26 prototype has been developed and tested at SSRF. This paper describes the mechanical system design¿simulation and testing results of the U26 prototype, as well as its compatibility with U55.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP035  
About • Received ※ 25 October 2023 — Revised ※ 07 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 11 December 2023
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THPPP036 Prototype of High Stability Mechanical Support for SHINE Project 328
 
  • R. Deng, H.X. Deng, F. Gao, X. Huang, Z. Lei, T.T. Zhen
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  
  Funding: CAS Project for Young Scientists in Basic Research (YSBR-042), National Natural Science Foundation of China (12125508, 11935020)¿Program of Shanghai Academic/Technology Research Leader (21XD1404100).
Quadrupole stability of undulator segment is key to the beam performance in SHINE project. Vibration stability requirement of quadrupole is not larger than 200nm displacement RMS between 1 and 100Hz, but the field test of SHINE tunnel shows that the underground vibration during the day time is greater than 200nm. In this paper, a mechanical support including marble base and active vibration reduction platform is sophisticated designed. With this support, vibration stability of the key quadrupole is expected to be improved and the performances of the quadrupole meet the demands. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP036  
About • Received ※ 25 October 2023 — Revised ※ 07 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 12 January 2024
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THPPP037 A Micro-Vibration Active Control Method Based on Piezoelectric Ceramic Actuator 330
 
  • Z. Lei, H.X. Deng, R. Deng
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  
  Funding: This work was supported by the CAS Project for Young Scientists in Basic Research (YSBR-042), the National Natural Science Foundation of China (12125508, 11935020)
In linear accelerator, ground vibration is transmitted to beam element (quadrupole magnet, etc.) through support, and then reflected to the influence of beam orbit or effective emittance. In order to reduce the influence of ground vibration on beam orbit stability, an active vibration isolation platform can be used. In this paper, an active vibration isolation system is proposed, which realizes the inverse dynamic process based on a nano-positioning platform and combines with a proportional controller to reduce the transmission of ground-based excitation to the beam element. The absolute vibration velocity signal obtained from the sensor is input to the controller as feedforward signal. The controller processes the input signal and then the output signal drives the piezoelectric ceramic actuator to generate displacement, realizing the active vibration control. The test results of the prototype show that the active vibration isolation system can achieve 50% displacement attenuation, which indicates that the vibration control strategy has certain engineering application value in the construction of large accelerators. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP037  
About • Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 15 December 2023
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THPPP038 Girders for SOLEIL-II Storage Ring 332
 
  • J. Da Silva Castro, S. Ducourtieux, Z. Fan, F. Lepage, A. Nadji, K. Tavakoli
    SOLEIL, Gif-sur-Yvette, France
  
  After two decades since its establishment, the SOLEIL Synchrotron facility needs to adapt to follow new scientific fields that have emerged since. After the Conceptual Design Report (CDR) phase for the facility Upgrade, the SOLEIL teams have been working for several months on the Technical Design Report (TDR). The ¿SOLEIL Upgrade¿ project is called ¿SOLEIL II¿ and is divided into several sub-projects. Among these sub-projects, one concerns storage ring Girders that will support all magnets of the new Lattice. These 86 Girders, each one supported by 2 plinths, must ensure an excellent degree of vibration stability. Before obtaining a final design for these Girders, a significant amount of study work has already been carried out (design, finite elements simulations, sub-assembly prototyping, dynamic measurements, tests, etc.). To validate the concepts, a fully equipped prototype girder was launched into manufacturing. In this contribution the preliminary studies and the ongoing investigations on SOLEIL II girder design will be presented.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP038  
About • Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 14 March 2024
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THPPP039
 Development of the BPM Support for HEPS  
 
  • A.X. Wang
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  The stability of beam orbit is absolutely the key performance indexes of a modern synchrotron radiation light source, which affects the performance of accelerator and the quality and stability of synchronous light in experimental line station directly. As a fourth generation synchrotron radiation light source, High Energy Photon Source (HEPS) has characteristics of high energy and low emissivity, which requires very high stability of beam orbit. Beam position monitor (BPM) is an precise instrument used for measuring beam position and orbit, and its mechanical vibration amplitude must less than 100 nm.Therefore, a independent support need to be distinctively designed. Based on the thermal stability and vibration stability, an ultra stability structure of rigid support is designed and optimized. Through the finite element modal analysis of ANSYS, the thermal expansion variation and the characteristic frequency of the support is verified.  
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THPPP040 The Girder System Prototype for ALBA II Storage Ring 335
 
  • L.R.M. Ribó, J.B. Boyer, C. Colldelram, N. González, L. Nikitina, F. Pérez
    ALBA-CELLS, Cerdanyola del Vallès, Spain
  
  The main goal of the upgrade of ALBA Synchrotron Light Facility into ALBA II is the transformation of the current accelerator into a diffraction limited storage ring, which implies the reduction of the emittance by at least a factor of twenty [1]. The upgrade will be executed before the end of the decade and will be profiting at maximum all existing ALBA infrastructures, in particular the building. The whole magnet layout of the lattice [2] has to be supported with a sequence of girders for their positioning with respect to another located in an adjacent girder with an accuracy of 50 µm to ensure the functionality of the accelerator. Besides the girders must enable the remote repositioning the magnets against the overall deformation of the site while ensuring the vibrational stability of the components on top. Easiness of assembling and installation of the different subsystems of the machine on top of the girder has to be considered also as a design requirement, in order to minimize the installation time. Two prototypes are planned to be built next year in order to check its full functionality
[1]ALBA II Accelerator Upgrade Project Status, IPAC¿23 proceedings
[2]Progress on the 6BA lattice for ALBAII, IPAC’23 proceedings
 		 
poster icon Poster THPPP040 [1.710 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP040  
About • Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 26 November 2023
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THPPP041
 Design of HEPS Booster Synchronous Radiation Light Extraction System  
 
  • J.M. Liu, S.M. Liu, X.Y. Sun, B. Tan, P.C. Wang
    DNSC, Dongguan, People’s Republic of China
  • Y.S. Mapresenter, D.C. Zhu
    IHEP, Beijing, People’s Republic of China
  • B.L. Zhu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  The HEPS Booster synchronous radiation light extraction system is a bending magnet source designed specifically for Booster beam size monitor, consisting of a vacuum chamber, diaphragm, and reflector. The function of the system is to provide specific synchrotron radiation light for the optical imaging system to measure the beam size. At present, the system has been successfully manufactured and installed. This article will introduce its design, thermal analysis, and manufacturing accuracy.  
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THPPP043
 Status of the Shenzhen Innovation Light Source Facility  
 
  • T. He
    Institute of Advaced Science Facilities, Shenzhen, Guangdong, People’s Republic of China
  
  The Shenzhen innovation light source facility (SILF) is a fourth generation of medium energy synchrotron radiation light source, which includes beamline system and accelerator system. The accelerator complex is composed of a 200 MeV linac, a 0.2-3.0GeV booster and a 3.0GeV storage ring. The circumference of the storage ring is 696 m, which includes 28 hybrid-7BA lattice periodic units to achieve an emittance below 100 pmrad. The SILF focuses on supporting the development of the domestic core industries, basic science frontier research and major strategic requirements, such as integrated circuits, biomedicine, advanced materials and advanced manufacturing. With the Shenzhen Municipal Government¿s approval of the SILF project proposal on Sep10 2020, the feasibility study and the conceptual design report of the SILF were completed in 2022. The preliminary design of the SILF is in progress.  
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THPPP046 Mechanical Design and Manufacture of Electromagnets in HEPS Storage Ring 339
 
  • L. Wu, S.Y. Chen, C.H. Li, Y.D. Xu, S. Yang
    IHEP, Beijing, People’s Republic of China
  
  The HEPS storage ring comprises 48 7BA (seven-bend achromat) cells. There are 37 independent magnets in every cell, of which 5 dipoles are permanent magnets and the rest of magnets are all electromagnets including quad-rupoles, D-Q(dipole-quadrupole) combined magnets, sextupoles, octupoles and corrector magnets. These elec-tromagnets with small aperture and high magnetic field gradient should achieve high machining and assembly precision. In October 2023, all storage ring electromag-nets manufacturing have been completed. This paper mainly introduces the mechanical design, processing and assembly, and the manufacturing issues in the machining period.  
poster icon Poster THPPP046 [2.016 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP046  
About • Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 January 2024
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THPPP047 NEG Film Development and Massive Coating production for HEPS 343
 
  • Y.S. Ma, H. Dong, D.Z. Guo, P. He, F. Sun, Y.C. Yang
    IHEP, Beijing, People’s Republic of China
  • T. Huang
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  Massive production facilities of NEG coated vacuum chambers have been developed for HEPS in Huairou, Beijing, which based on the NEG coating prototypes of HEPS-TF. The facilities can achieve simultaneous coating of 16~20 vacuum chambers of HEPS including irregular shaped vacuum chambers. The pumping per-formance of the NEG coated vacuum chambers has been measured by test facilities. After heating at 200°C for 24 hours, the highest pumping speed of H₂ is about 0.65 l/scm2, and the highest capacity of CO is about 1.89×10-5 mbar·L/cm2. The lifetime is more than 20 cycles of air exposure and re-activation. The pumping performance meets the design requirements of HEPS. Currently the NEG coated vacuum chambers are applied to the storage ring of HEPS.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP047  
About • Received ※ 02 November 2023 — Revised ※ 09 November 2023 — Accepted ※ 22 November 2023 — Issued ※ 18 July 2024
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THPPP049 Realization of a Compact APPLE X Undulator 346
 
  • L.K. Roslund, M.A. Al-Najdawi, L.F. Balbin, S.M. Benedictssonpresenter, M. Ebbeni, M. Holz, H. Tarawneh, K. Åhnberg
    MAX IV Laboratory, Lund University, Lund, Sweden
  
  The APPLE X is a compact elliptically polarizing undulator with a small round magnetic gap that provides full polarization control of synchrotron radiation at a lower cost and in less built-in space than comparable devices. The APPLE X will be the source for MAX IV’s potential future Soft X-ray (SXL) FEL. The mechanical design, finite element analysis optimization, assembly process, magnetic measurements, and shimming of a full-scale 2 m, 40 mm-period SmCo permanent magnet undulator are presented.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP049  
About • Received ※ 23 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 07 December 2023
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THPPP050 Overview of the Unified Undulator Solution for the PolFEL Project 349
 
  • J.J. Wiechecki
    NSRC SOLARIS, Kraków, Poland
  • P. Krawczyk, R. Nietubyc
    NCBJ, Świerk/Otwock, Poland
  • P.R. Romanowicz, D.T. Ziemiański
    CUT, Kraków, Poland
  
  The PolFEL project, consisting of building a free electron laser, will be the first in Poland and one of the several sources in the world of coherent, tuneable electromagnetic radiation within the wide spectrum range from THz to VUV, emitted in pulses from femtoseconds to picoseconds, with high impulse power or high average power. The research infrastructure will include a free electron laser (FEL), a photocathode testing laboratory, end-stations, and laboratories necessary for the operation of the apparatus, and laboratories for users from the beamlines. The main FEL accelerator will consist of three independent branches, which will include chains of undulators adjusted to three different energy ranges: VUV, IR and THZ. The main challenge was the unification of the final undulator solution, so that it could be applied to all three branches. The main goal of this approach was to save time, costs, human and material resources. The overview of issues and solutions related to the construction of undulators for the PolFEL project, and the challenges that had to be fulfilled to reach the final design, is presented in this publication.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP050  
About • Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 25 March 2024
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THPPP051
 The Aluminium Vacuum Chamber  
 
  • Y.M. Wen
    SINAP, Shanghai, People’s Republic of China
  
  There are two out-vacuum undulator lines been adopt in Shanghai Hard Free Electron Laser(SHINE), so there are Aluminium vacuum chambers in SHINE. There are 42 sets small gap out-vacuum undulators(U26), the length is 4 meters. The minimum working gap of the U26 is 7mm, the beam clear area of the vacuum chamber is 5mmX11mm, The vacuum pressure is lower than 1X10-7Torr, and the internal surface roughness of the ellipse is less than 200nm. At present, the first article has completed offline vacuum pre-installation and debugging. The minimum thickness of the U26 aluminum vacuum chamber is only 0.5mm, the gap between the U26 aluminum vacuum chamber and the magnet is only 0.5mm, the total length is 4.35 meters, there is very difficult for the U26 aluminum vacuum chamber. In order to develop this vacuum chamber, the structural design has been optimized, the tooling should be precise and the process should be optimized during processing. The internal surface roughness of the ellipse is less than 200 nm by abrasive flow polishing. At present, the development accuracy of U26 aluminum vacuum chamber reach the requirements.  
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THPPP052 Design and Development of Coated Chamber for In-Air Insertion Devices 352
 
  • P.C. Wang, Y. Wang
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  • H. Dong, Y.S. Mapresenter, Y.G. Wang, L. Zhang
    IHEP, Beijing, People’s Republic of China
  • J.M. Liu, S.M. Liu, X.Y. Sun
    DNSC, Dongguan, People’s Republic of China
  • B. Tan
    Institute of High Energy Physics, CAS, Guangdong, People’s Republic of China
  • B.L. Zhu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  
  The insertion devices ¿ID¿is an important guarantee for further improving the performance of the light source to meet the needs of different users. For in-air ID (undulator, wiggler, etc.), the magnetic structure is in the air, and the vacuum chamber is in the middle of the magnetic structure to ensure the normal operation of the beam. In order to increase the magnetic field strength, the magnetic gap is generally relatively small. Factors such as small setting space, high precision, and low conductance all pose challenges to the design and processing of vacuum chamber. This paper introduces the development process of the vacuum chamber prototype of the coating type ID for the China ’s first diffraction-limited light source HEPS. The simultaneous analysis and vacuum pressure distribution calculation of the ID are carried out, and the NEG coating scheme is proposed as an more economical means to obtain ultra-high vacuum. The prototype NEG coating progress is introduced.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP052  
About • Received ※ 02 November 2023 — Revised ※ 10 November 2023 — Accepted ※ 12 November 2023 — Issued ※ 18 July 2024
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THPPP053 CLSI LINAC Upgrade Project 355
 
  • L.X. Lin, J.N. Campbell, S.R. Carriere, F. Le Pimpec, K.D. Wyatt
    CLS, Saskatoon, Saskatchewan, Canada
  
  The Canadian Light Source Inc. (CLSI) is undertaking a significant Linear Accelerator (LINAC) injector Up-grade Project to enhance both the mechanical reliability and operational stability of Canada’s primary re-search synchrotron facility. In late 2018, a critical gun failure led to a seven-month facility downtime. . This incident raised concerns that the original LINAC from 1980 continued to be a high risk to daily facility operations. Furthermore, several other mechanical systems within the facility, including cooling/heating water, HVAC, and certain aspects of the LINAC vacuum systems, have also aged, resulting in decreased reliability. The upgrade to the LINAC and its associated mechanical systems presents an opportunity to significantly improve the operational reliability of the entire facility.  
DOI • reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP053  
About • Received ※ 20 October 2023 — Revised ※ 07 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 June 2024
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THPPP054
 The Development of Multiplexing Imaging Experimental Instruments  
 
  • S.H. Kim
    PAL, Pohang, Republic of Korea
  
  Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL) has been officially provided to users from 2017. After the first user beam time, the PAL-XFEL beamline have proceeded with the development of a multiplexing experimental device as one of the specific coherent diffraction imaging science programs to secure global competitiveness. A multiplexing imaging device has been developed to enable small & wide-angle diffraction and X-ray emission spectroscopy experiments to be performed simultaneously in one chamber under a vacuum level of 10-4 to 10-5 torr. In addition, we adopted the Jungfrau 5M x-ray detector through a module arrangement suited to the purpose of our experiment. These developments also will be applied to the Korea’s Fourth-Generation Storage Ring (4GSR) beamline instruments.  
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THPPP055
 Instrumentation Front-End at NSLS-II  
 
  • M.P. Johanson, L. Doom, C. Hetzel, B.N. Kosciuk, D. Padrazo, J. Rank, S.K. Sharma, R.J. Todd
    BNL, Upton, New York, USA
  
  The Instrumentation Front End (IFE) is the upstream end of a R&D beamline at NSLS-II for testing new design concepts needed for the future upgrade of NSLS-II and other accelerator facilities. The IFE utilizes a refurbished U68 planar undulator as the source of high intensity synchrotron radiation (x-rays). The main components of the IFE are the undulator source, a fixed mask, two slits with integral XBPMs, and a test photon shutter. The first planned test will establish thermal fatigue design criteria for a copper alloy, CuCrZr, adopted recently for most of the high-power beam stops and slits. A beam stop of Soleil-II (France) made from powder CuCrZr will also be tested for its thermal fatigue life. Another planned test will evaluate a new XBPM design that will help improve the X-ray beam stability. In the second phase the IFE will be extended to a test beamline on the experimental floor. This poster serves to showcase its main features and capabilities, and present future possibilities.  
poster icon Poster THPPP055 [3.229 MB]  
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THPPP056
 A New Beamline for Multi-Scale Structural Characterization of Hierarchical Materials  
 
  • V.H. Haghighat, S.A. McDonald, K. Nygård
    MAX IV Laboratory, Lund University, Lund, Sweden
  
  ForMAX is a new beamline at the MAX IV Laboratory, combining small- and wide-angle x-ray scattering (SWAXS), scanning SWAXS imaging, and full-field microtomography for multi-scale structural characterization of hierarchical materials from nm to mm length scales, with temporal resolution to study materials processes in situ under specific environments. ForMAX is founded by industrial partners and private foundations to advance research and development of sustainable materials and specialty chemicals from forest raw materials, but the beamline will also be open for general users. Here we will describe the beamline concept, focusing on the novel combination of SWAXS and full-field tomography. ForMAX has finished the commissioning phase in early 2023 and currently is in regular user operation.  
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