MEDSI2023 - List of Keywords (photon)

Paper	Title	Other Keywords	Page
TUPYP001	Shining Light on Precision: Unraveling XBPMs at the Australian Synchrotron	laser, synchrotron, feedback, monitoring	33
	B. Lin, J. McKinlay, S. Porsa, Y.E. Tan AS - ANSTO, Clayton, Australia
	At the Australian Synchrotron (AS), the need for nondestructive X-ray beam positioning monitors (XBPM) in the beamline front ends led to the development and installation of an in-house prototype using the photoelectric effect in 2021. This prototype served as a proof of concept and an initial step towards creating a customised solution for real time X-ray position monitoring. Of the new beamlines being installed at the AS, the High-Performance Macromolecular Crystallography (MX3) and Nanoprobe beamlines require XBPMs due to their small spot size and high stability requirements. However, a significant hurdle is the short distance from the source point to the XBPM location, resulting in an extremely restricted aperture to accurately monitor the beam position. Scaling down the photoelectric prototype to accommodate the available space has proven challenging, prompting us to explore alternative designs that utilize temperature-based methods to determine the beam position. This paper details insights made from investigating this alternative method and design.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP001
About •	Received ※ 02 November 2023 — Revised ※ 03 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 11 February 2024
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TUPYP017	Design and Test of Precision Mechanics for High Energy Resolution Monochromator at the HEPS	synchrotron, experiment, controls, GUI	51
	L. Zhang, H. Liang, Z.K. Liu, W. Xu, Y. Yang, Y.S. Zhang IHEP, Beijing, People’s Republic of China
	A monochromator stands as a typical representative of optical component within synchrotron radiation light sources. High resolution monochromators (HRMs), which incorporate precision positioning, stability control, and various other technologies, are a crucial subclass within this category. The next generation of photon sources imposes higher performance standards upon these HRMs. In this new design framework, the primary focus is on innovating precision motion components. Rigorous analysis and experimentation have confirmed the effectiveness of this design. This structural model provides valuable reference for developing other precision adjustment mechanisms within the realm of synchrotron radiation.
	Poster TUPYP017 [3.641 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP017
About •	Received ※ 01 November 2023 — Revised ※ 03 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 04 February 2024
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TUPYP018	Design and Improvements of a Cryo-Cooled Horizontal Diffracting Double Crystal Monochromator for HEPS	vacuum, cavity, cryogenics, ISOL	55
	Y.S. Zhang, H. Liang, Y.S. Lu, D.S. Shen, L. Zhang IHEP, Beijing, People’s Republic of China
	Horizontal diffracting double crystal monochromator(HDCM) are usually used in a 4th generation light source beamline due to the larger source size in the horizontal direction. This paper introduces the mechanical design and optimization of a HDCM for Low-dimension Structure Probe Beamline of HEPS. In order to achieve the high stability requirement of 50nrad RMS, the structural design is optimized and modal improved through FEA. In order to meet the requirement of a total crystal slope error below 0.3¿rad, FEA optimizations of the clamping for first and second crystal are carried out. The vacuum chamber is optimized to become more compact, improving the maintainability. Fabrication of the HDCM is under way. The results show that the design is capable of guarantee the required surface slope error, stability, and adjustment requirements.
	Poster TUPYP018 [1.172 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP018
About •	Received ※ 02 November 2023 — Revised ※ 03 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 11 May 2024
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TUPYP026	Influence of the Groove Curvature on the Spectral Resolution in a Varied-Line-Spacing Plane Grating Monochromator (VLS-PGM)	factory, synchrotron, target, experiment	67
	J. Du, X.W. Du, Q.P. Wang, Z. Wang USTC/NSRL, Hefei, Anhui, People’s Republic of China
	Diffraction-limited synchrotron radiation (DLSR) light source with smaller source size and emittance makes ultra-high spectral resolution beamline possible. Here, we report an undulator-based beamline optical design with ultra-high spectral resolution using a varied-line-spacing plane grating monochromator (VLS-PGM), which is a well-proven design for achieving ultra-high resolution in the soft X-ray band. A VLS plane grating with a central groove density of 2400 l/mm is utilized to cover the photon energy region of 250 ~ 2000eV. VLS gratings are generally fabricated using the holographic method, but the resulting grating grooves are two-dimensionally curved curves, which can affect the resolution of the monochromator. To analyse this effect, we first use a spherical wavefront and an aspherical wavefront to generate the fringes and optimized the recording parameters. We also present a method for calculating the groove curvature of holographic plane VLS grating grooves. Furthermore, the influence of grating groove curvature on beamline resolution is theoretically analysed based on the aberration theory of concave grating.
	Poster TUPYP026 [0.480 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP026
About •	Received ※ 25 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 04 November 2023 — Issued ※ 12 March 2024
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TUPYP037	Mechanical Design of Multilayer Kirkpatrick-Baez (KB) Mirror System for Structural Dynamics Beamline (SDB) at High Energy Photon Source (HEPS)	simulation, optics, synchrotron, experiment	82
	R.Y. Liao, L. Gao, Z.N. Ou, S. Tang, H.H. Yu, B.B. Zhang IHEP, People’s Republic of China
	SDB aims in-situ real-time diagnosis in dynamic compression science and additive manufacturing. Nano-experimental environment requires highly multilayer KB mirror system in thermal deformation and stability of mechanism. This paper illustrates the KB cooling scheme and mechanical design. Only using variable-length water cooling to control the temperature and thermal deformation of mirror has limitations here. First, the installation of cooling system should be non-contact so that the surface shape can be sophisticatedly controlled without deformation of chucking power. Second, the distance between the HKB and the sample stage is too small to arrange the cooling pipe. Third, the KB mirror has multi-dimensional attitude adjustment. Cu water cooling pipe would be dragged with adjustment thus it has to be bent for motion decoupling, which occupies considerable space. Thus, the Cu cooling block and water cooling pipe are connected by copper braid. Eutectic Gallium-Indium fills a 100 ¿m gap between the cooling block and KB mirror to avoid chunking power deformation. Finally, the structural stability and chamber sealability is analyzed.
	Poster TUPYP037 [1.234 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP037
About •	Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 12 April 2024
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TUPYP038	A Design of an X-Ray Pink Beam Integrated Shutter for HEPS	vacuum, cavity, simulation, controls	85
	S. Liu, Q. Han, G. Mo, A.Y. Zhou IHEP, People’s Republic of China
	The main function of the shutter is to accurately control the exposure time of the sample so that the sample as well as the detector can be protected. In order to cover the high thermal load and high energy working environment, we designed an integrated shutter device. The device includes a thermal absorber shutter, a piezoelectric ceramic fast shutter, a vacuum chamber and an adjustable height base. Firstly SPECTRA and ANSYS were used to verify the device’s institutional temperature reliability at a thermal power density of 64W/mm2. In addition, the device is suitable for both monochromatic and pink light operation with a horizontal pitch of 15mm. The device is also compatible with both vacuum and atmospheric working environments, and the recollimation of the device is not necessary when switching modes. Finally, the thermal absorber shutter is also able to function as a beam profile monitor, and the position of the spot can be monitored through a viewing window on the cavity.
	Poster TUPYP038 [0.781 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP038
About •	Received ※ 08 November 2023 — Revised ※ 10 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 18 December 2023
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TUPYP043	The Design of Test Beamline at HEPS	brightness, experiment, wiggler, undulator	90
	J.L. Yang, Q.J. Jia, M. Li, P. Liu, Y. Tao IHEP, People’s Republic of China
	This paper describes the design of a test beamline for a new generation of high-energy, high-flux, and high-coherence SR beamlines. The beamline will be built at ID42 of HEPS. The beamline includes two sources, a wiggler and an undulator, to provide high-energy, high thermal power, large size, and high-coherence, high-brightness X-ray beams, respectively. In the current design, the beamline mainly has optical components such as monochromators, CRLs, and filters. With different combinations of sources and optical components, the beamline can provide various modes, including white, monochromatic, and focused beam. Using a Si111 DCM, the beamline covers a wide photon energy range from 5 to 45 keV. In the future, the beamline will be capable of providing monochromatic beam with photon energy over 300 keV. The wiggler’s white beam can provide high thermal load test conditions over 1 kW. The beamline offers high flexibility and versatility in terms of available beam size (from micrometers to over 100 mm), energy resolution, and photon flux range. Various experimental techniques including diffraction, spectroscopy, imaging, and at-wavelength measurement can be performed on this beamline.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP043
About •	Received ※ 08 November 2023 — Revised ※ 09 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 18 April 2024
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TUPYP050	Design and Calculation of Vacuum System for WALS Storage Ring	vacuum, storage-ring, radiation, synchrotron	105
	C.Y. Liu, Y. Chen, X.R. Hao, J.H. He, H.H. Li, H. Li, J. Li, Y. Nie, J. Wang, Y. Wang, G. Wei, P. Xiang, Y. Xu, J.M. Zhang, Y.X. Zhang, Y. Zou IAS, Wuhan City, People’s Republic of China
	Funding: * Work supported by the Key R&D Project of Hubei Provincial Department of Science and Technology, No. 2021AFB001. Wuhan Advanced Light Source (WALS) is a fourth-generation synchrotron radiation facility with 1.5 GeV designed energy and 500 mA beam current. The storage ring vacuum system has to be designed in such a way which is compatible with a multi-bend achromat (MBA) compact lattice. the new technology of non-evaporable getter (NEG) coating was used, which is more and more popular in accelerator equipment. The design of the whole vacuum chamber and the nec-essary calculations were posted in the paper. The results indicated that the design of the vacuum system can meet the design requirement.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP050
About •	Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 15 November 2023 — Issued ※ 18 July 2024
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WEOAM04	Development of Low-Frequency Superconducting Cavities for High Energy Photon Source	cavity, HOM, cryomodule, superconducting-cavity	129
	X.Y. Zhang, J. Dai, L. Guo, Q. Ma, F. Meng, P. Zhang, H.J. Zheng IHEP, Beijing, People’s Republic of China
	Funding: This work was supported in part by High Energy Photon Source, and in part by the National Natural Science Foundation of China under Grant 12005241. A low-frequency superconducting cavity is one of the most critical devices in the High Energy Photon Source (HEPS), a 6 GeV diffraction-limited synchrotron light source under construction in Beijing. A higher-order-mode (HOM) damped 166.6 MHz ß=1 quarter-wave superconducting cavity, first of its kind in the world, has been designed by the Institute of High Energy Physics. Compact structure, excellent electromagnetic and mechanical properties and manufacturability were realized. Mounted with a forward power coupler, a tuner, two thermal break beam tubes, a collimating taper transition, two gate valves and some shielded bellows, the dressed cavity was then assembled into a cryomodule. Two cryomodules were later required to fit into HEPS straight sections with a length limitation of 6 meters, which posed a significant challenge for the design of the cavity string. The success of the horizontal test also verifies the design of the cavity string. This article presents the design, fabrication, post-processing, system integration, and cryogenic tests of the first HOM-damped compact 166.6 MHz superconducting cavity module.
	Slides WEOAM04 [23.093 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOAM04
About •	Received ※ 25 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 December 2023
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WEOBM02	Development of the Bent Focusing Mirror in HEPS from Design to Test	focusing, ECR, SRF, synchrotron	136
	M.W. Chen, M. Li, S. Tang, F.G. Yang IHEP, People’s Republic of China
	The focusing mirrors are important for each beamline in the 4th generation photon source. One bent focusing face-down mirror in HEPS is taken for an example to be introduced from the design to the test. The effect of the gravity of the mirror is considered in the design. Moreover, for the sake of the compromise between the processing and the precision, the polygonal structure is adopted. Also, the iteration of the solution is improved to increase the design efficiency. The results reveal that the theoretical precision of the mirror after bending can reach less than 100 nrad RMS. In the aspect of the mechanics, the scheme of four roller bender comes out to avoid the parasitic moment, and the movable component in the bender are all coated with the MoS2. As the type of the measurement is facing side which is different from the type of the actual condition, the effect of the gravity must be included in the metrology results. In the meantime, the stability and the repeatability are also measured. The result can be converged to around 200 nrad RMS, which is less than the required error. The stability, ¿R/R, can be constrained under the 0.6%, showing the outstanding performance.
	Slides WEOBM02 [3.638 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOBM02
About •	Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 16 April 2024
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WEPPP015	Progress of Front Ends at HEPS	radiation, insertion-device, synchrotron, storage-ring	175
	H. Shi, P. Luo, Y.X. Ma, Y. Tan, H.Y. Wang IHEP, Beijing, People’s Republic of China
	High Energy Photon Source (HEPS) is a 6GeV synchrotron radiation facility building in Huairou, with a storage ring perimeter of 1390.6m and 41 straight sections. In phase I, 15 front ends will be installed, including 14 insertion device front ends and 1 bending magnet front end. These front ends are divided into three types: the Undulator front end, the Wiggler front end, and the BM front end. The U-type front end will receive 766W/mrad² of peak power density and 25kW of the total power. The design of the W-type front end is based on compatibility with various insertion devices, including udulators and wigglers. In this paper, the designs and the progress of HEPS front ends are presented.
	Poster WEPPP015 [2.147 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP015
About •	Received ※ 01 November 2023 — Revised ※ 04 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 08 January 2024
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WEPPP016	Mechanical Design of XRS & RIXS Multi-Functional Spectrometer at the High Energy Photon Source	scattering, synchrotron, synchrotron-radiation, radiation	178
	J.C. Zhang, Z.Y. Guo, X. Jia, S.X. Jin, Z.N. Ou, W.F. Sheng, S. Tang, R.Z. Xu, W. Xu, Y.J. Zhang IHEP, Beijing, People’s Republic of China
	The integration of an X-ray Raman spectroscopy (XRS) spectrometer and a Resonant Inelastic X-ray scattering (RIXS) spectrometer at HEPS is described. The XRS has 6 regular modular groups and 1 high resolution modular group. In total 90 pieces of spherically bent analyzer crystals are mounted in low vacuum chambers with pressure lower than 100Pa. On the other hand, the RIXS spectrometer possesses one spherically bent analyzer crystal configured in Rowland geometry whose diameter is changeable from 1m to 2m. The scattering X-ray photons transport mostly in helium chamber to reduce absorption by air. The RIXS and the high resolution module can be exchanged when needed. Six air feet are set under the granite plate to unload the weight when the heavy spectrometer is aligned. The natural frequency and statics of the main granite rack were analyzed and optimized to maintain high stability for the HEPS-ID33 beamline at the 4th generation source. A type of compact and cost-effective adjustment gadget for the crystals was designed and fabricated. Economic solutions in selection of motors and sensors and other aspects were adopted for building the large spectrometer like this.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP016
About •	Received ※ 02 November 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 11 April 2024
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WEPPP019	Coating Removal of Silicon-Based Mirror in Synchrotron Radiation by Soluble Underlayers	optics, synchrotron, synchrotron-radiation, radiation	181
	Q. Hou, G.C. Chang, B. Ji, M. Li, S.P. Yue IHEP, People’s Republic of China
	Multilayer optics is widely used for the x-ray beam monochromatization, focusing, and collimation in synchrotron light source. However, the multilayer coatings might be damaged by the high heat loads, the poor film adhesion, the high internal stress, or the inadequate vacuum conditions. As a result, it is essential to develop a method to make the optical substrate reusable without compromising its quality. In our published work, we successfully prepared a W/B4C multilayer coating with a 2 nm Cr buffer layer on a small-sized Si wafer. The coating was stripped from the Si substrate by dissolving the Cr buffer layer using an etchant. After the etching process, the sample’s roughness was comparable to that of a brand-new substrate. We have since utilized this method to clean the multilayers on the surface of a 20 cm × 5 cm silicon-based mirror for High Energy Photon Source (HEPS). The surface roughness and shape were measured, and they reached the level of a brand-new mirror.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP019
About •	Received ※ 02 November 2023 — Revised ※ 04 November 2023 — Accepted ※ 06 November 2023 — Issued ※ 19 December 2023
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WEPPP029	A Novel Flexible Design of the FaXToR End Station at ALBA	detector, GUI, experiment, synchrotron	190
	L.R.M. Ribó, N. González, L. Nikitina, A.P. Patera ALBA-CELLS, Cerdanyola del Vallès, Spain A. Mittone ANL, Lemont, Illinois, USA
	FaXToR is one of the beamlines currently in con-struction and commissioning phase at ALBA, dedicat-ed to fast hard X-ray imaging. It will offer absorption and phase contrast imaging to users. Possible applica-tions of the beamline include 3D static and dynamic inspections in a wide range of applications. FaXToR aims to provide both white and monochromatic beam of maximum 36x14 mm (HxV) at sample position with a photon energy up to 70 keV. The optical layout of the beamline will tune the beam depending on the specific experimental conditions. Among the required optical elements, there is a multilayer monochromator, the cooled slits, the filtering elements, the intensity moni-tor and the beam absorption elements. The end station will be equipped with a rotary sample stage and a de-tector system table to accommodate a dual detection thus simultaneously scanning the samples with high spatial and temporal resolutions. On top of it, a motor-ized auxiliary table dedicated to complex sample envi-ronment or future upgrades will translate along the total table length, independently from the two detector system bridges. The design and construction process of the beamline will be presented.
	Poster WEPPP029 [0.851 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP029
About •	Received ※ 26 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 10 December 2023
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WEPPP032	Photon Slits Prototype for High Beam Power Using Rotational Motions	operation, undulator, optics, vacuum	196
	X. Liu, W. Cheng, L. Hudson, H. Patel, A.C. Walters DLS, Oxfordshire, United Kingdom
	A new slits prototype utilising a rotatable oxygen-free high thermal conductivity (OFHC) copper block to absorb high heat load is developed for the Diamond-II upgrade. The slits will be used at front end of Diamond I13 X-ray Imaging and Coherence beamline which has two canted beamline branches. Required by the beamline optics, the front end slits function as virtual sources for the 250 meters long beamline. Working for the dual beam geometry, these specialised slits can vary the size of one x-ray beam with rotational motions while allowing the second beam to pass through unaffected. The rotational operations of the slits are achieved by an innovative commercial flex pivot and a unique in-house designed pivoting flexure.
	Poster WEPPP032 [1.377 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP032
About •	Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 18 February 2024
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WEPPP044	Development of High Power Density Photon Absorber for Super-B Sections in SSRF	vacuum, radiation, SRF, storage-ring	215
	Q. Tang, Y. Liu, Q.L. Zhang, Y.L. Zhao SARI-CAS, Pudong, Shanghai, People’s Republic of China C. Jin SKY Technology Development Co., Ltd. Chinese Academy of Sciences, Shengyang, People’s Republic of China
	There are two symmetrical standard bend sections been updated to super-bend sections in the storage of Shanghai Synchrotron Radiation Facility(SSRF). Photon absorbers made up of CuCrZr were used for absorbing radiation with very high power density in the super-bend sections. Meanwhile, CuCrZr absorbers were also used as beam chamber and pump port for the lattice of super-bend section is very compacted. The absorbing surface was designed as serrate structure in order to diminish the power density. CuCrZr was cold-forged before machining to enhance its strength, thermal conductivity and hardness. Friction welding is adopted for absorber fabrication to avoid the material properties of absorber deterioration. Rectangle flanges of absorbers were designed as step rather than knifer for vacuum seal. These high power density photon absorbers have been installed on the storage ring, both pressure and temperature being in accordance with design anticipation in the case of beam of 240 mA running.
	Poster WEPPP044 [1.597 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP044
About •	Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 02 April 2024
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THPPP015	Mechanical Design of the Novel Precise Secondary Source Slits	simulation, alignment, vacuum, GUI	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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THPPP023	Design and Test of a New Crystal Assembly for a Double Crystal Monochromator	monitoring, vacuum, synchrotron, HOM	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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FROAM02	Vacuum System of SPS-II: Challenges of Conventional Technology in Thailand New Generation Synchrotron Light Source	vacuum, simulation, synchrotron, storage-ring	363
	T. Phimsen, S. Boonsuya, S. Chaichuay, S. Chitthaisong, N. Juntong, P. Klysubun, S. Prawanta, T. Pulampong, K. Sittisard, S. Srichan, P. Sudmuang, P. Sunwong SLRI, Nakhon-Ratchasima, Thailand
	Siam Photon Source II (SPS-II) is the first Thailand¿s 4th generation synchrotron light source. It not only provides high-energy and high-brightness synchrotron radiation for both academic and industrial research after its completion, but it is also strategically aimed to build up a stronger Thai industrial community during the design and construction period. Vacuum system is one of the systems expected to play a key role in leveling up the local manufacturing capability of the country. Most of the main components in the system are planned to domestically fabricate through technology transfer. Instead of NEG coating technology, this vacuum system design of SPS-II storage ring is based on the conventional technology which involves Thai industry potential and expertise. This paper reviews the challenges and adaptation of conservative design in dense DTBA magnet lattice with magnet aperture limitation. The vacuum chambers and bending magnets have been modified to accommodate IR beamlines which are included in the second phase plan. Pressure profile of the vacuum system in storage ring is evaluated. Then, the progress of overall vacuum system of SPS-II is described.
	Slides FROAM02 [14.635 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-FROAM02
About •	Received ※ 02 November 2023 — Revised ※ 08 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 25 March 2024
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FROAM04	Stability and Vibration Control for High Energy Photon Source in China	ground-motion, storage-ring, ion-source, lattice	368
	F. Yan, Z. Duan, P. He, X.Y. Huang, D. Ji, Y. Jiao, G.P. Lin, W.M. Pan, X.Y. Tan, Z.H. Wang, Y. Wei, G. Xu, Y. Yang IHEP, Beijing, People’s Republic of China
	TThe High Energy Photon Source (HEPS) is the first high-energy diffraction-limited storage ring (DLSR) light source to be built in China with natural emittance of few tens of picometer radian. Beam stability is critical for such an ultralow-emittance facility. Controlling and minimizing the sources and transmission of vibrations internally and externally of HEPS is an important issue for achieving the stability needed to generate and operate the high brightest beams. In this presentation, we report that the vibration levels on bare HEPS ground, the ground motion analytical model related with frequency, the designed site vibration specifications together with the careful consideration and basis. Also, the stable building design concepts, passive and active ways to minimize effects on the stability of the photon beam and critical accelerator and beamline components caused by ambient ground motion sources and the actual control effect will be introduced in detail.
	Slides FROAM04 [4.238 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-FROAM04
About •	Received ※ 02 November 2023 — Revised ※ 07 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 18 November 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

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TUPYP001

Shining Light on Precision: Unraveling XBPMs at the Australian Synchrotron

laser, synchrotron, feedback, monitoring

33

B. Lin, J. McKinlay, S. Porsa, Y.E. Tan
AS - ANSTO, Clayton, Australia

At the Australian Synchrotron (AS), the need for nondestructive X-ray beam positioning monitors (XBPM) in the beamline front ends led to the development and installation of an in-house prototype using the photoelectric effect in 2021. This prototype served as a proof of concept and an initial step towards creating a customised solution for real time X-ray position monitoring. Of the new beamlines being installed at the AS, the High-Performance Macromolecular Crystallography (MX3) and Nanoprobe beamlines require XBPMs due to their small spot size and high stability requirements. However, a significant hurdle is the short distance from the source point to the XBPM location, resulting in an extremely restricted aperture to accurately monitor the beam position. Scaling down the photoelectric prototype to accommodate the available space has proven challenging, prompting us to explore alternative designs that utilize temperature-based methods to determine the beam position. This paper details insights made from investigating this alternative method and design.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP001

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Received ※ 02 November 2023 — Revised ※ 03 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 11 February 2024

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TUPYP017

Design and Test of Precision Mechanics for High Energy Resolution Monochromator at the HEPS

synchrotron, experiment, controls, GUI

51

L. Zhang, H. Liang, Z.K. Liu, W. Xu, Y. Yang, Y.S. Zhang
IHEP, Beijing, People’s Republic of China

A monochromator stands as a typical representative of optical component within synchrotron radiation light sources. High resolution monochromators (HRMs), which incorporate precision positioning, stability control, and various other technologies, are a crucial subclass within this category. The next generation of photon sources imposes higher performance standards upon these HRMs. In this new design framework, the primary focus is on innovating precision motion components. Rigorous analysis and experimentation have confirmed the effectiveness of this design. This structural model provides valuable reference for developing other precision adjustment mechanisms within the realm of synchrotron radiation.

Poster TUPYP017 [3.641 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP017

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Received ※ 01 November 2023 — Revised ※ 03 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 04 February 2024

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TUPYP018

Design and Improvements of a Cryo-Cooled Horizontal Diffracting Double Crystal Monochromator for HEPS

vacuum, cavity, cryogenics, ISOL

55

Y.S. Zhang, H. Liang, Y.S. Lu, D.S. Shen, L. Zhang
IHEP, Beijing, People’s Republic of China

Horizontal diffracting double crystal monochromator(HDCM) are usually used in a 4th generation light source beamline due to the larger source size in the horizontal direction. This paper introduces the mechanical design and optimization of a HDCM for Low-dimension Structure Probe Beamline of HEPS. In order to achieve the high stability requirement of 50nrad RMS, the structural design is optimized and modal improved through FEA. In order to meet the requirement of a total crystal slope error below 0.3¿rad, FEA optimizations of the clamping for first and second crystal are carried out. The vacuum chamber is optimized to become more compact, improving the maintainability. Fabrication of the HDCM is under way. The results show that the design is capable of guarantee the required surface slope error, stability, and adjustment requirements.

Poster TUPYP018 [1.172 MB]

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reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP018

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Received ※ 02 November 2023 — Revised ※ 03 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 11 May 2024

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TUPYP026

Influence of the Groove Curvature on the Spectral Resolution in a Varied-Line-Spacing Plane Grating Monochromator (VLS-PGM)

factory, synchrotron, target, experiment

67

J. Du, X.W. Du, Q.P. Wang, Z. Wang
USTC/NSRL, Hefei, Anhui, People’s Republic of China

Diffraction-limited synchrotron radiation (DLSR) light source with smaller source size and emittance makes ultra-high spectral resolution beamline possible. Here, we report an undulator-based beamline optical design with ultra-high spectral resolution using a varied-line-spacing plane grating monochromator (VLS-PGM), which is a well-proven design for achieving ultra-high resolution in the soft X-ray band. A VLS plane grating with a central groove density of 2400 l/mm is utilized to cover the photon energy region of 250 ~ 2000eV. VLS gratings are generally fabricated using the holographic method, but the resulting grating grooves are two-dimensionally curved curves, which can affect the resolution of the monochromator. To analyse this effect, we first use a spherical wavefront and an aspherical wavefront to generate the fringes and optimized the recording parameters. We also present a method for calculating the groove curvature of holographic plane VLS grating grooves. Furthermore, the influence of grating groove curvature on beamline resolution is theoretically analysed based on the aberration theory of concave grating.

Poster TUPYP026 [0.480 MB]

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reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP026

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Received ※ 25 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 04 November 2023 — Issued ※ 12 March 2024

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TUPYP037

Mechanical Design of Multilayer Kirkpatrick-Baez (KB) Mirror System for Structural Dynamics Beamline (SDB) at High Energy Photon Source (HEPS)

simulation, optics, synchrotron, experiment

82

R.Y. Liao, L. Gao, Z.N. Ou, S. Tang, H.H. Yu, B.B. Zhang
IHEP, People’s Republic of China

SDB aims in-situ real-time diagnosis in dynamic compression science and additive manufacturing. Nano-experimental environment requires highly multilayer KB mirror system in thermal deformation and stability of mechanism. This paper illustrates the KB cooling scheme and mechanical design. Only using variable-length water cooling to control the temperature and thermal deformation of mirror has limitations here. First, the installation of cooling system should be non-contact so that the surface shape can be sophisticatedly controlled without deformation of chucking power. Second, the distance between the HKB and the sample stage is too small to arrange the cooling pipe. Third, the KB mirror has multi-dimensional attitude adjustment. Cu water cooling pipe would be dragged with adjustment thus it has to be bent for motion decoupling, which occupies considerable space. Thus, the Cu cooling block and water cooling pipe are connected by copper braid. Eutectic Gallium-Indium fills a 100 ¿m gap between the cooling block and KB mirror to avoid chunking power deformation. Finally, the structural stability and chamber sealability is analyzed.

Poster TUPYP037 [1.234 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP037

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Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 12 April 2024

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TUPYP038

A Design of an X-Ray Pink Beam Integrated Shutter for HEPS

vacuum, cavity, simulation, controls

85

S. Liu, Q. Han, G. Mo, A.Y. Zhou
IHEP, People’s Republic of China

The main function of the shutter is to accurately control the exposure time of the sample so that the sample as well as the detector can be protected. In order to cover the high thermal load and high energy working environment, we designed an integrated shutter device. The device includes a thermal absorber shutter, a piezoelectric ceramic fast shutter, a vacuum chamber and an adjustable height base. Firstly SPECTRA and ANSYS were used to verify the device’s institutional temperature reliability at a thermal power density of 64W/mm2. In addition, the device is suitable for both monochromatic and pink light operation with a horizontal pitch of 15mm. The device is also compatible with both vacuum and atmospheric working environments, and the recollimation of the device is not necessary when switching modes. Finally, the thermal absorber shutter is also able to function as a beam profile monitor, and the position of the spot can be monitored through a viewing window on the cavity.

Poster TUPYP038 [0.781 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP038

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Received ※ 08 November 2023 — Revised ※ 10 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 18 December 2023

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TUPYP043

The Design of Test Beamline at HEPS

brightness, experiment, wiggler, undulator

90

J.L. Yang, Q.J. Jia, M. Li, P. Liu, Y. Tao
IHEP, People’s Republic of China

This paper describes the design of a test beamline for a new generation of high-energy, high-flux, and high-coherence SR beamlines. The beamline will be built at ID42 of HEPS. The beamline includes two sources, a wiggler and an undulator, to provide high-energy, high thermal power, large size, and high-coherence, high-brightness X-ray beams, respectively. In the current design, the beamline mainly has optical components such as monochromators, CRLs, and filters. With different combinations of sources and optical components, the beamline can provide various modes, including white, monochromatic, and focused beam. Using a Si111 DCM, the beamline covers a wide photon energy range from 5 to 45 keV. In the future, the beamline will be capable of providing monochromatic beam with photon energy over 300 keV. The wiggler’s white beam can provide high thermal load test conditions over 1 kW. The beamline offers high flexibility and versatility in terms of available beam size (from micrometers to over 100 mm), energy resolution, and photon flux range. Various experimental techniques including diffraction, spectroscopy, imaging, and at-wavelength measurement can be performed on this beamline.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP043

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Received ※ 08 November 2023 — Revised ※ 09 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 18 April 2024

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TUPYP050

Design and Calculation of Vacuum System for WALS Storage Ring

vacuum, storage-ring, radiation, synchrotron

105

C.Y. Liu, Y. Chen, X.R. Hao, J.H. He, H.H. Li, H. Li, J. Li, Y. Nie, J. Wang, Y. Wang, G. Wei, P. Xiang, Y. Xu, J.M. Zhang, Y.X. Zhang, Y. Zou
IAS, Wuhan City, People’s Republic of China

Funding: * Work supported by the Key R&D Project of Hubei Provincial Department of Science and Technology, No. 2021AFB001.
Wuhan Advanced Light Source (WALS) is a fourth-generation synchrotron radiation facility with 1.5 GeV designed energy and 500 mA beam current. The storage ring vacuum system has to be designed in such a way which is compatible with a multi-bend achromat (MBA) compact lattice. the new technology of non-evaporable getter (NEG) coating was used, which is more and more popular in accelerator equipment. The design of the whole vacuum chamber and the nec-essary calculations were posted in the paper. The results indicated that the design of the vacuum system can meet the design requirement.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP050

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Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 15 November 2023 — Issued ※ 18 July 2024

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WEOAM04

Development of Low-Frequency Superconducting Cavities for High Energy Photon Source

cavity, HOM, cryomodule, superconducting-cavity

129

X.Y. Zhang, J. Dai, L. Guo, Q. Ma, F. Meng, P. Zhang, H.J. Zheng
IHEP, Beijing, People’s Republic of China

Funding: This work was supported in part by High Energy Photon Source, and in part by the National Natural Science Foundation of China under Grant 12005241.
A low-frequency superconducting cavity is one of the most critical devices in the High Energy Photon Source (HEPS), a 6 GeV diffraction-limited synchrotron light source under construction in Beijing. A higher-order-mode (HOM) damped 166.6 MHz ß=1 quarter-wave superconducting cavity, first of its kind in the world, has been designed by the Institute of High Energy Physics. Compact structure, excellent electromagnetic and mechanical properties and manufacturability were realized. Mounted with a forward power coupler, a tuner, two thermal break beam tubes, a collimating taper transition, two gate valves and some shielded bellows, the dressed cavity was then assembled into a cryomodule. Two cryomodules were later required to fit into HEPS straight sections with a length limitation of 6 meters, which posed a significant challenge for the design of the cavity string. The success of the horizontal test also verifies the design of the cavity string. This article presents the design, fabrication, post-processing, system integration, and cryogenic tests of the first HOM-damped compact 166.6 MHz superconducting cavity module.

Slides WEOAM04 [23.093 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOAM04

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Received ※ 25 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 December 2023

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WEOBM02

Development of the Bent Focusing Mirror in HEPS from Design to Test

focusing, ECR, SRF, synchrotron

136

M.W. Chen, M. Li, S. Tang, F.G. Yang
IHEP, People’s Republic of China

The focusing mirrors are important for each beamline in the 4th generation photon source. One bent focusing face-down mirror in HEPS is taken for an example to be introduced from the design to the test. The effect of the gravity of the mirror is considered in the design. Moreover, for the sake of the compromise between the processing and the precision, the polygonal structure is adopted. Also, the iteration of the solution is improved to increase the design efficiency. The results reveal that the theoretical precision of the mirror after bending can reach less than 100 nrad RMS. In the aspect of the mechanics, the scheme of four roller bender comes out to avoid the parasitic moment, and the movable component in the bender are all coated with the MoS2. As the type of the measurement is facing side which is different from the type of the actual condition, the effect of the gravity must be included in the metrology results. In the meantime, the stability and the repeatability are also measured. The result can be converged to around 200 nrad RMS, which is less than the required error. The stability, ¿R/R, can be constrained under the 0.6%, showing the outstanding performance.

Slides WEOBM02 [3.638 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOBM02

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Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 07 November 2023 — Issued ※ 16 April 2024

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WEPPP015

Progress of Front Ends at HEPS

radiation, insertion-device, synchrotron, storage-ring

175

H. Shi, P. Luo, Y.X. Ma, Y. Tan, H.Y. Wang
IHEP, Beijing, People’s Republic of China

High Energy Photon Source (HEPS) is a 6GeV synchrotron radiation facility building in Huairou, with a storage ring perimeter of 1390.6m and 41 straight sections. In phase I, 15 front ends will be installed, including 14 insertion device front ends and 1 bending magnet front end. These front ends are divided into three types: the Undulator front end, the Wiggler front end, and the BM front end. The U-type front end will receive 766W/mrad² of peak power density and 25kW of the total power. The design of the W-type front end is based on compatibility with various insertion devices, including udulators and wigglers. In this paper, the designs and the progress of HEPS front ends are presented.

Poster WEPPP015 [2.147 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP015

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Received ※ 01 November 2023 — Revised ※ 04 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 08 January 2024

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WEPPP016

Mechanical Design of XRS & RIXS Multi-Functional Spectrometer at the High Energy Photon Source

scattering, synchrotron, synchrotron-radiation, radiation

178

J.C. Zhang, Z.Y. Guo, X. Jia, S.X. Jin, Z.N. Ou, W.F. Sheng, S. Tang, R.Z. Xu, W. Xu, Y.J. Zhang
IHEP, Beijing, People’s Republic of China

The integration of an X-ray Raman spectroscopy (XRS) spectrometer and a Resonant Inelastic X-ray scattering (RIXS) spectrometer at HEPS is described. The XRS has 6 regular modular groups and 1 high resolution modular group. In total 90 pieces of spherically bent analyzer crystals are mounted in low vacuum chambers with pressure lower than 100Pa. On the other hand, the RIXS spectrometer possesses one spherically bent analyzer crystal configured in Rowland geometry whose diameter is changeable from 1m to 2m. The scattering X-ray photons transport mostly in helium chamber to reduce absorption by air. The RIXS and the high resolution module can be exchanged when needed. Six air feet are set under the granite plate to unload the weight when the heavy spectrometer is aligned. The natural frequency and statics of the main granite rack were analyzed and optimized to maintain high stability for the HEPS-ID33 beamline at the 4th generation source. A type of compact and cost-effective adjustment gadget for the crystals was designed and fabricated. Economic solutions in selection of motors and sensors and other aspects were adopted for building the large spectrometer like this.

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reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP016

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Received ※ 02 November 2023 — Revised ※ 06 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 11 April 2024

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WEPPP019

Coating Removal of Silicon-Based Mirror in Synchrotron Radiation by Soluble Underlayers

optics, synchrotron, synchrotron-radiation, radiation

181

Q. Hou, G.C. Chang, B. Ji, M. Li, S.P. Yue
IHEP, People’s Republic of China

Multilayer optics is widely used for the x-ray beam monochromatization, focusing, and collimation in synchrotron light source. However, the multilayer coatings might be damaged by the high heat loads, the poor film adhesion, the high internal stress, or the inadequate vacuum conditions. As a result, it is essential to develop a method to make the optical substrate reusable without compromising its quality. In our published work, we successfully prepared a W/B4C multilayer coating with a 2 nm Cr buffer layer on a small-sized Si wafer. The coating was stripped from the Si substrate by dissolving the Cr buffer layer using an etchant. After the etching process, the sample’s roughness was comparable to that of a brand-new substrate. We have since utilized this method to clean the multilayers on the surface of a 20 cm × 5 cm silicon-based mirror for High Energy Photon Source (HEPS). The surface roughness and shape were measured, and they reached the level of a brand-new mirror.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP019

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Received ※ 02 November 2023 — Revised ※ 04 November 2023 — Accepted ※ 06 November 2023 — Issued ※ 19 December 2023

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WEPPP029

A Novel Flexible Design of the FaXToR End Station at ALBA

detector, GUI, experiment, synchrotron

190

L.R.M. Ribó, N. González, L. Nikitina, A.P. Patera
ALBA-CELLS, Cerdanyola del Vallès, Spain
A. Mittone
ANL, Lemont, Illinois, USA

FaXToR is one of the beamlines currently in con-struction and commissioning phase at ALBA, dedicat-ed to fast hard X-ray imaging. It will offer absorption and phase contrast imaging to users. Possible applica-tions of the beamline include 3D static and dynamic inspections in a wide range of applications. FaXToR aims to provide both white and monochromatic beam of maximum 36x14 mm (HxV) at sample position with a photon energy up to 70 keV. The optical layout of the beamline will tune the beam depending on the specific experimental conditions. Among the required optical elements, there is a multilayer monochromator, the cooled slits, the filtering elements, the intensity moni-tor and the beam absorption elements. The end station will be equipped with a rotary sample stage and a de-tector system table to accommodate a dual detection thus simultaneously scanning the samples with high spatial and temporal resolutions. On top of it, a motor-ized auxiliary table dedicated to complex sample envi-ronment or future upgrades will translate along the total table length, independently from the two detector system bridges. The design and construction process of the beamline will be presented.

Poster WEPPP029 [0.851 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP029

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Received ※ 26 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 10 December 2023

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WEPPP032

Photon Slits Prototype for High Beam Power Using Rotational Motions

operation, undulator, optics, vacuum

196

X. Liu, W. Cheng, L. Hudson, H. Patel, A.C. Walters
DLS, Oxfordshire, United Kingdom

A new slits prototype utilising a rotatable oxygen-free high thermal conductivity (OFHC) copper block to absorb high heat load is developed for the Diamond-II upgrade. The slits will be used at front end of Diamond I13 X-ray Imaging and Coherence beamline which has two canted beamline branches. Required by the beamline optics, the front end slits function as virtual sources for the 250 meters long beamline. Working for the dual beam geometry, these specialised slits can vary the size of one x-ray beam with rotational motions while allowing the second beam to pass through unaffected. The rotational operations of the slits are achieved by an innovative commercial flex pivot and a unique in-house designed pivoting flexure.

Poster WEPPP032 [1.377 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP032

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Received ※ 24 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 18 February 2024

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WEPPP044

Development of High Power Density Photon Absorber for Super-B Sections in SSRF

vacuum, radiation, SRF, storage-ring

215

Q. Tang, Y. Liu, Q.L. Zhang, Y.L. Zhao
SARI-CAS, Pudong, Shanghai, People’s Republic of China
C. Jin
SKY Technology Development Co., Ltd. Chinese Academy of Sciences, Shengyang, People’s Republic of China

There are two symmetrical standard bend sections been updated to super-bend sections in the storage of Shanghai Synchrotron Radiation Facility(SSRF). Photon absorbers made up of CuCrZr were used for absorbing radiation with very high power density in the super-bend sections. Meanwhile, CuCrZr absorbers were also used as beam chamber and pump port for the lattice of super-bend section is very compacted. The absorbing surface was designed as serrate structure in order to diminish the power density. CuCrZr was cold-forged before machining to enhance its strength, thermal conductivity and hardness. Friction welding is adopted for absorber fabrication to avoid the material properties of absorber deterioration. Rectangle flanges of absorbers were designed as step rather than knifer for vacuum seal. These high power density photon absorbers have been installed on the storage ring, both pressure and temperature being in accordance with design anticipation in the case of beam of 240 mA running.

Poster WEPPP044 [1.597 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP044

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Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 02 April 2024

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THPPP015

Mechanical Design of the Novel Precise Secondary Source Slits

simulation, alignment, vacuum, GUI

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

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Received ※ 25 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 28 November 2023

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THPPP023

Design and Test of a New Crystal Assembly for a Double Crystal Monochromator

monitoring, vacuum, synchrotron, HOM

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

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Received ※ 02 November 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 19 December 2023

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FROAM02

Vacuum System of SPS-II: Challenges of Conventional Technology in Thailand New Generation Synchrotron Light Source

vacuum, simulation, synchrotron, storage-ring

363

T. Phimsen, S. Boonsuya, S. Chaichuay, S. Chitthaisong, N. Juntong, P. Klysubun, S. Prawanta, T. Pulampong, K. Sittisard, S. Srichan, P. Sudmuang, P. Sunwong
SLRI, Nakhon-Ratchasima, Thailand

Siam Photon Source II (SPS-II) is the first Thailand¿s 4th generation synchrotron light source. It not only provides high-energy and high-brightness synchrotron radiation for both academic and industrial research after its completion, but it is also strategically aimed to build up a stronger Thai industrial community during the design and construction period. Vacuum system is one of the systems expected to play a key role in leveling up the local manufacturing capability of the country. Most of the main components in the system are planned to domestically fabricate through technology transfer. Instead of NEG coating technology, this vacuum system design of SPS-II storage ring is based on the conventional technology which involves Thai industry potential and expertise. This paper reviews the challenges and adaptation of conservative design in dense DTBA magnet lattice with magnet aperture limitation. The vacuum chambers and bending magnets have been modified to accommodate IR beamlines which are included in the second phase plan. Pressure profile of the vacuum system in storage ring is evaluated. Then, the progress of overall vacuum system of SPS-II is described.

Slides FROAM02 [14.635 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-FROAM02

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Received ※ 02 November 2023 — Revised ※ 08 November 2023 — Accepted ※ 09 November 2023 — Issued ※ 25 March 2024

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FROAM04

Stability and Vibration Control for High Energy Photon Source in China

ground-motion, storage-ring, ion-source, lattice

368

F. Yan, Z. Duan, P. He, X.Y. Huang, D. Ji, Y. Jiao, G.P. Lin, W.M. Pan, X.Y. Tan, Z.H. Wang, Y. Wei, G. Xu, Y. Yang
IHEP, Beijing, People’s Republic of China

TThe High Energy Photon Source (HEPS) is the first high-energy diffraction-limited storage ring (DLSR) light source to be built in China with natural emittance of few tens of picometer radian. Beam stability is critical for such an ultralow-emittance facility. Controlling and minimizing the sources and transmission of vibrations internally and externally of HEPS is an important issue for achieving the stability needed to generate and operate the high brightest beams. In this presentation, we report that the vibration levels on bare HEPS ground, the ground motion analytical model related with frequency, the designed site vibration specifications together with the careful consideration and basis. Also, the stable building design concepts, passive and active ways to minimize effects on the stability of the photon beam and critical accelerator and beamline components caused by ambient ground motion sources and the actual control effect will be introduced in detail.

Slides FROAM04 [4.238 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-FROAM04

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Received ※ 02 November 2023 — Revised ※ 07 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 18 November 2023

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