MEDSI2023 - List of Keywords (storage-ring)

Paper	Title	Other Keywords	Page
TUPYP015	Investigation of Vibrations Attenuation with Different Frequency Along HEPS Ground	experiment, site, controls, ion-source	48
	Y. Yang, X.Y. Tan, Z.H. Wang, F. Yan IHEP, Beijing, People’s Republic of China X.R. Fu, W. Wu, L. Yan CAU, Haidian District, Beijing, People’s Republic of China J. Lei Peking University, Beijing, Haidian District, People’s Republic of China
	High Energy Photon Source (HEPS) has a strict restriction on vibration instabilities. To fulfill the stability specification, vibration levels on HEPS site must be controlled. The control standards are highly related with the vibration amplitude of the sources and the distance between sources and the critical positions. To establish reasonable regulations for new-built vibration sources, the decay patterns on ground are investigated on HEPS site for different frequency noises. A series of experiments were conducted using shaker to generate vibrations with frequency from 1Hz up to 100Hz. The vibration attenuation on ground and slab were measured using seismometers and the attenuation law were analyzed. Details will be presented in this paper.
	Poster TUPYP015 [0.525 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP015
About •	Received ※ 08 November 2023 — Revised ※ 08 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 12 April 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPYP050	Design and Calculation of Vacuum System for WALS Storage Ring	vacuum, photon, 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPYP053	Current Status of Vibration Monitoring System at SOLARIS	operation, software, synchrotron, monitoring	111
	M. Piszak NSRC SOLARIS, Kraków, Poland
	Solaris synchrotron radiation centre, despite being relatively new facility, began expansion of its experimental hall in 2022 in order to accommodate new beamlines. The construction works were carried out along with regular accelerators and beamlines operation and generated high levels of vibration. To better understand the influence of vibrations on electron and x-ray beams¿ stability, an accelerometer-based monitoring system was designed and implemented. The system consists of a triaxial measurement point equipped with seismic accelerometers located on bending magnet inside storage ring and a central signal conditioning and acquisition point. The results of long-term vibration data collection and analysis will be presented along with plans for the future system expansion.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP053
About •	Received ※ 25 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 12 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOBM01	Challenges and Solutions for the Mechanical Design of SOLEIL-II	dipole, lattice, synchrotron, vacuum	133
	K. Tavakoli, F. Alves, G. Baranton, Y. Benyakhlef, A. Berlioux, A. Carcy, M.-E. Couprie, J. Da Silva Castro, S. Ducourtieux, Z. Fan, C. Herbeaux, C.A. Kitégi, A. Le Jollec, F. Lepage, V. Leroux, A. Loulergue, F. Marteau, A. Mary, A. Nadji, S. Pautard, V. Pinty, M. Ribbens, T.S. Thoraud SOLEIL, Gif-sur-Yvette, France
	The Synchrotron SOLEIL is a large-scale research facility in France that provides synchrotron radiation from terahertz to hard X-rays for various scientific applications. To meet the evolving needs of the scientific community and to remain competitive with other European facilities, SOLEIL has planned an upgrade project called SOLEIL-II. The project aims to reconstruct the storage ring as a Diffraction Limited Storage Ring (DLSR) with a record low emittance which will enable nanometric resolution. The mechanical design of the upgrade project involves several challenges such as the integration of new magnets, vacuum chambers, insertion devices and beamlines in the existing infrastructure, the optimization of the alignment and stability of the components, and the minimization of the downtime during the transition from SOLEIL to SOLEIL-II. The mechanical design is mainly based on extensive simulations, prototyping and testing to ensure the feasibility, reliability, and performance of several key elements. This abstract presents an overview of the mechanical design concepts and solutions adopted for the SOLEIL-II project.
	Slides WEOBM01 [8.729 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOBM01
About •	Received ※ 25 September 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 03 April 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEOBM05	Thermal Calculation and Testing of SLS 2.0 Crotch Absorbers	simulation, GUI, synchrotron, synchrotron-radiation	145
	X. Wang, B.S. Bugmann, R. Ganter, M. Maeher, C. Rosenberg, A. Weber PSI, Villigen PSI, Switzerland
	The storage ring of SLS2.0 based on a multibend achromat lattice will have the maximum electron energy of 2.7 GeV. The synchrotron radiation emitted by bending magnets, except for a small portion designated to beamlines, will be dissipated by crotch absorbers to protect downstream vacuum elements. SLS2.0 crotch absorbers are designed to have two water-cooled, toothed jaws made of Glidcop to dissipate a maximum heat power of 6 kW. Finite element analysis has been conducted to validate the thermal and mechanical strength of the absorbers’ mechanical design. A conjugate heat transfer (CHT) simulation, utilizing direct coupled solid and fluid zones with Computational Fluid Dynamics (CFD) software ANSYS Fluent, was performed to verify the water cooling concept. Furthermore, a prototype absorber underwent testing in an e-beam welding chamber, where the temperatures of the absorber and cooling water were measured and compared against calculated values. The test results not only confirmed the absorber’s ability to dissipate the specified heat load but also validated the thermal modelling methods. This presentation will focus on aspects of numerical simulation and thermal testing.
	Slides WEOBM05 [5.159 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOBM05
About •	Received ※ 25 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 12 March 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP015	Progress of Front Ends at HEPS	photon, radiation, insertion-device, synchrotron	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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP044	Development of High Power Density Photon Absorber for Super-B Sections in SSRF	photon, vacuum, radiation, SRF	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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP047	Installation Process Experiment of HEPS Storage Ring Equipment	alignment, experiment, sextupole, vacuum	222
	C.H. Li, F.S. Chen, S.Y. Chen, L. Dong, G. Feng, S. Lu, Z.H. Wang, L. Wu, Y.F. Wu, Y.D. Xu, M. Yang, S. Yang IHEP, Beijing, People’s Republic of China
	HEPS is a new generation synchrotron radiation source under construction in China. In order to complete high-precision installation of the 1.4km storage ring within a limited construction period, it is necessary to identify and solve potential issues in various aspects, including opera-tion space, installation process, alignment scheme, and unit transportation, prior to the regular batch installation. Therefore, a full-process installation experiment was performed and the feasibility of relevant schemes are verified. Batch installation is currently in progress based on the experimental experience.
	Poster WEPPP047 [0.874 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP047
About •	Received ※ 20 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 23 March 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP051	The Design of a 2 m Long Copper Light Extraction Vessel at Diamond Light Source for the Diamond-II Upgrade	vacuum, impedance, simulation, extraction	233
	V. Danielyan, M.P. Cox, R.T. Fielder, S.L. Hodbod, T. Lockwood, P.J. Vivian DLS, Oxfordshire, United Kingdom
	Challenges associated with the design are, firstly, the heat loads of I05 beamline upgrade involving the installation of a powerful and highly divergent APPLE-II Knot Insertion Device. Secondly, it is not easy to produce the required homogeneous NEG (non-evaporable getter) coating on the complex internal geometry of the vessel. Synchrotron light raytracing and thermal analysis has shown that an aluminium vessel with discrete copper absorbers was not capable of handling the high heat loads and it was decided to change to a copper vessel with large integrated absorbing surfaces. FEA analysis of the copper vessel shows the peak temperature is reduced from 446°C to 95°C for the copper vessel as compared to the aluminium vessel. NEG coating trials are currently in progress and will be followed by a full prototype. The minimum vertical aperture is 6 mm and the trials will show whether it can be reduced to 5 mm. The change from an aluminium vessel to a copper vessel will not only reduce the peak temperature of the vessel thereby making it a workable solution, but has the added benefits of improved vacuum performance, reduced beam impedance and reduced capital and operating cost.
	Poster WEPPP051 [1.861 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP051
About •	Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 06 November 2023 — Issued ※ 02 June 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPPP054	Vibration Analysis of Storage Ring Girder for the Korea 4GSR	operation, synchrotron, alignment, resonance	236
	G.W. Hong, T. Ha, H.S. Han, H.-G. Lee PAL, Pohang, Republic of Korea
	Ensuring the mechanical stability of the girder for a 4th generation storage ring (4GSR) is crucial to provide a high-quality photon beam to users because the mechanical motion should be maintained at less than 10% of the electron beam size which is expected to be sub-micrometer. One of the key roles of the girder is to provide structural rigidity and temperature stability while effectively suppressing vibrations from the ground during accelerator operation. The Korea 4GSR girder is being designed to have the first natural frequency above 50 Hz to minimize the effect of the ground vibration. In order to maintain better mechanical stability, it is necessary to conduct research not only on the natural vibration evaluation of the girder but also on external vibrations to the girder structure. In this paper, we introduce the result of the harmonic analysis of the girder structure using the finite element method.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP054
About •	Received ※ 25 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 July 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP013	Studies on the Influences of Longitudinal Gradient Bending Magnet Fabrication Tolerances on the Field Quality for SILF Storage Ring	HOM, radiation, extraction, synchrotron	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 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

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	experiment, simulation, HOM, synchrotron	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 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP020	The Pre-alignment of High Energy Photon Source Storage Ring	alignment, target, laser, real-time	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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP038	Girders for SOLEIL-II Storage Ring	dipole, lattice, synchrotron, alignment	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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP040	The Girder System Prototype for ALBA II Storage Ring	vacuum, GUI, interface, lattice	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 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP046	Mechanical Design and Manufacture of Electromagnets in HEPS Storage Ring	quadrupole, sextupole, octupole, controls	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 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPPP047	NEG Film Development and Massive Coating production for HEPS	vacuum, cathode, synchrotron, ECR	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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FROAM01	Design and Testing of HEPS Storage Ring Magnet Support System	simulation, alignment, experiment, sextupole	358
	Z.H. Wang, S.Y. Chen, C.H. Li, M.X. Li, H. Wang, L. Wu, Y.D. Xu, S. Yang, N.C. Zhou IHEP, Beijing, People’s Republic of China
	Very low emittance of High Energy Photon Source (HEPS) demands high stability and adjusting performance of the magnet support. The alignment error between girders should be less than 50 ¿m. Based on that, the adjusting resolution of the girder are required to be less than 5 ¿m in both transverse and vertical directions. Besides, the natural frequency of magnet support system should be higher than 54 Hz to avoid the amplification of ground vibrations. To fulfill the requirements, during the development of the prototype, the structure was designed through topology optimization, static analysis, grouting experiments, dynamic stiffness test and modal analysis, and the rationality of the structure was verified through prototype experiments. During the tunnel installation, the performance of the magnet support system was again verified to be better than the design requirements through test work after installation.
	Slides FROAM01 [7.976 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-FROAM01
About •	Received ※ 25 October 2023 — Revised ※ 07 November 2023 — Accepted ※ 17 February 2024 — Issued ※ 12 March 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FROAM02	Vacuum System of SPS-II: Challenges of Conventional Technology in Thailand New Generation Synchrotron Light Source	vacuum, simulation, photon, synchrotron	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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FROAM04	Stability and Vibration Control for High Energy Photon Source in China	ground-motion, ion-source, photon, 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

Title

Other Keywords

Page

TUPYP015

Investigation of Vibrations Attenuation with Different Frequency Along HEPS Ground

experiment, site, controls, ion-source

48

Y. Yang, X.Y. Tan, Z.H. Wang, F. Yan
IHEP, Beijing, People’s Republic of China
X.R. Fu, W. Wu, L. Yan
CAU, Haidian District, Beijing, People’s Republic of China
J. Lei
Peking University, Beijing, Haidian District, People’s Republic of China

High Energy Photon Source (HEPS) has a strict restriction on vibration instabilities. To fulfill the stability specification, vibration levels on HEPS site must be controlled. The control standards are highly related with the vibration amplitude of the sources and the distance between sources and the critical positions. To establish reasonable regulations for new-built vibration sources, the decay patterns on ground are investigated on HEPS site for different frequency noises. A series of experiments were conducted using shaker to generate vibrations with frequency from 1Hz up to 100Hz. The vibration attenuation on ground and slab were measured using seismometers and the attenuation law were analyzed. Details will be presented in this paper.

Poster TUPYP015 [0.525 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP015

About •

Received ※ 08 November 2023 — Revised ※ 08 November 2023 — Accepted ※ 10 November 2023 — Issued ※ 12 April 2024

Cite •

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

TUPYP050

Design and Calculation of Vacuum System for WALS Storage Ring

vacuum, photon, 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

Cite •

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

TUPYP053

Current Status of Vibration Monitoring System at SOLARIS

operation, software, synchrotron, monitoring

111

M. Piszak
NSRC SOLARIS, Kraków, Poland

Solaris synchrotron radiation centre, despite being relatively new facility, began expansion of its experimental hall in 2022 in order to accommodate new beamlines. The construction works were carried out along with regular accelerators and beamlines operation and generated high levels of vibration. To better understand the influence of vibrations on electron and x-ray beams¿ stability, an accelerometer-based monitoring system was designed and implemented. The system consists of a triaxial measurement point equipped with seismic accelerometers located on bending magnet inside storage ring and a central signal conditioning and acquisition point. The results of long-term vibration data collection and analysis will be presented along with plans for the future system expansion.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-TUPYP053

About •

Received ※ 25 October 2023 — Revised ※ 03 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 12 December 2023

Cite •

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

WEOBM01

Challenges and Solutions for the Mechanical Design of SOLEIL-II

dipole, lattice, synchrotron, vacuum

133

K. Tavakoli, F. Alves, G. Baranton, Y. Benyakhlef, A. Berlioux, A. Carcy, M.-E. Couprie, J. Da Silva Castro, S. Ducourtieux, Z. Fan, C. Herbeaux, C.A. Kitégi, A. Le Jollec, F. Lepage, V. Leroux, A. Loulergue, F. Marteau, A. Mary, A. Nadji, S. Pautard, V. Pinty, M. Ribbens, T.S. Thoraud
SOLEIL, Gif-sur-Yvette, France

The Synchrotron SOLEIL is a large-scale research facility in France that provides synchrotron radiation from terahertz to hard X-rays for various scientific applications. To meet the evolving needs of the scientific community and to remain competitive with other European facilities, SOLEIL has planned an upgrade project called SOLEIL-II. The project aims to reconstruct the storage ring as a Diffraction Limited Storage Ring (DLSR) with a record low emittance which will enable nanometric resolution. The mechanical design of the upgrade project involves several challenges such as the integration of new magnets, vacuum chambers, insertion devices and beamlines in the existing infrastructure, the optimization of the alignment and stability of the components, and the minimization of the downtime during the transition from SOLEIL to SOLEIL-II. The mechanical design is mainly based on extensive simulations, prototyping and testing to ensure the feasibility, reliability, and performance of several key elements. This abstract presents an overview of the mechanical design concepts and solutions adopted for the SOLEIL-II project.

Slides WEOBM01 [8.729 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOBM01

About •

Received ※ 25 September 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 03 April 2024

Cite •

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

WEOBM05

Thermal Calculation and Testing of SLS 2.0 Crotch Absorbers

simulation, GUI, synchrotron, synchrotron-radiation

145

X. Wang, B.S. Bugmann, R. Ganter, M. Maeher, C. Rosenberg, A. Weber
PSI, Villigen PSI, Switzerland

The storage ring of SLS2.0 based on a multibend achromat lattice will have the maximum electron energy of 2.7 GeV. The synchrotron radiation emitted by bending magnets, except for a small portion designated to beamlines, will be dissipated by crotch absorbers to protect downstream vacuum elements. SLS2.0 crotch absorbers are designed to have two water-cooled, toothed jaws made of Glidcop to dissipate a maximum heat power of 6 kW. Finite element analysis has been conducted to validate the thermal and mechanical strength of the absorbers’ mechanical design. A conjugate heat transfer (CHT) simulation, utilizing direct coupled solid and fluid zones with Computational Fluid Dynamics (CFD) software ANSYS Fluent, was performed to verify the water cooling concept. Furthermore, a prototype absorber underwent testing in an e-beam welding chamber, where the temperatures of the absorber and cooling water were measured and compared against calculated values. The test results not only confirmed the absorber’s ability to dissipate the specified heat load but also validated the thermal modelling methods. This presentation will focus on aspects of numerical simulation and thermal testing.

Slides WEOBM05 [5.159 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEOBM05

About •

Received ※ 25 October 2023 — Revised ※ 04 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 12 March 2024

Cite •

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

WEPPP015

Progress of Front Ends at HEPS

photon, radiation, insertion-device, synchrotron

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

Cite •

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

WEPPP044

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

photon, vacuum, radiation, SRF

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

Cite •

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

WEPPP047

Installation Process Experiment of HEPS Storage Ring Equipment

alignment, experiment, sextupole, vacuum

222

C.H. Li, F.S. Chen, S.Y. Chen, L. Dong, G. Feng, S. Lu, Z.H. Wang, L. Wu, Y.F. Wu, Y.D. Xu, M. Yang, S. Yang
IHEP, Beijing, People’s Republic of China

HEPS is a new generation synchrotron radiation source under construction in China. In order to complete high-precision installation of the 1.4km storage ring within a limited construction period, it is necessary to identify and solve potential issues in various aspects, including opera-tion space, installation process, alignment scheme, and unit transportation, prior to the regular batch installation. Therefore, a full-process installation experiment was performed and the feasibility of relevant schemes are verified. Batch installation is currently in progress based on the experimental experience.

Poster WEPPP047 [0.874 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP047

About •

Received ※ 20 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 23 March 2024

Cite •

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

WEPPP051

The Design of a 2 m Long Copper Light Extraction Vessel at Diamond Light Source for the Diamond-II Upgrade

vacuum, impedance, simulation, extraction

233

V. Danielyan, M.P. Cox, R.T. Fielder, S.L. Hodbod, T. Lockwood, P.J. Vivian
DLS, Oxfordshire, United Kingdom

Challenges associated with the design are, firstly, the heat loads of I05 beamline upgrade involving the installation of a powerful and highly divergent APPLE-II Knot Insertion Device. Secondly, it is not easy to produce the required homogeneous NEG (non-evaporable getter) coating on the complex internal geometry of the vessel. Synchrotron light raytracing and thermal analysis has shown that an aluminium vessel with discrete copper absorbers was not capable of handling the high heat loads and it was decided to change to a copper vessel with large integrated absorbing surfaces. FEA analysis of the copper vessel shows the peak temperature is reduced from 446°C to 95°C for the copper vessel as compared to the aluminium vessel. NEG coating trials are currently in progress and will be followed by a full prototype. The minimum vertical aperture is 6 mm and the trials will show whether it can be reduced to 5 mm. The change from an aluminium vessel to a copper vessel will not only reduce the peak temperature of the vessel thereby making it a workable solution, but has the added benefits of improved vacuum performance, reduced beam impedance and reduced capital and operating cost.

Poster WEPPP051 [1.861 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP051

About •

Received ※ 24 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 06 November 2023 — Issued ※ 02 June 2024

Cite •

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

WEPPP054

Vibration Analysis of Storage Ring Girder for the Korea 4GSR

operation, synchrotron, alignment, resonance

236

G.W. Hong, T. Ha, H.S. Han, H.-G. Lee
PAL, Pohang, Republic of Korea

Ensuring the mechanical stability of the girder for a 4th generation storage ring (4GSR) is crucial to provide a high-quality photon beam to users because the mechanical motion should be maintained at less than 10% of the electron beam size which is expected to be sub-micrometer. One of the key roles of the girder is to provide structural rigidity and temperature stability while effectively suppressing vibrations from the ground during accelerator operation. The Korea 4GSR girder is being designed to have the first natural frequency above 50 Hz to minimize the effect of the ground vibration. In order to maintain better mechanical stability, it is necessary to conduct research not only on the natural vibration evaluation of the girder but also on external vibrations to the girder structure. In this paper, we introduce the result of the harmonic analysis of the girder structure using the finite element method.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-WEPPP054

About •

Received ※ 25 October 2023 — Revised ※ 06 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 18 July 2024

Cite •

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

THPPP013

Studies on the Influences of Longitudinal Gradient Bending Magnet Fabrication Tolerances on the Field Quality for SILF Storage Ring

HOM, radiation, extraction, synchrotron

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 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

Cite •

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

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

experiment, simulation, HOM, synchrotron

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 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

Cite •

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

THPPP020

The Pre-alignment of High Energy Photon Source Storage Ring

alignment, target, laser, real-time

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

Cite •

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

THPPP038

Girders for SOLEIL-II Storage Ring

dipole, lattice, synchrotron, alignment

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

Cite •

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

THPPP040

The Girder System Prototype for ALBA II Storage Ring

vacuum, GUI, interface, lattice

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 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

Cite •

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

THPPP046

Mechanical Design and Manufacture of Electromagnets in HEPS Storage Ring

quadrupole, sextupole, octupole, controls

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 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

Cite •

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

THPPP047

NEG Film Development and Massive Coating production for HEPS

vacuum, cathode, synchrotron, ECR

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

Cite •

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

FROAM01

Design and Testing of HEPS Storage Ring Magnet Support System

simulation, alignment, experiment, sextupole

358

Z.H. Wang, S.Y. Chen, C.H. Li, M.X. Li, H. Wang, L. Wu, Y.D. Xu, S. Yang, N.C. Zhou
IHEP, Beijing, People’s Republic of China

Very low emittance of High Energy Photon Source (HEPS) demands high stability and adjusting performance of the magnet support. The alignment error between girders should be less than 50 ¿m. Based on that, the adjusting resolution of the girder are required to be less than 5 ¿m in both transverse and vertical directions. Besides, the natural frequency of magnet support system should be higher than 54 Hz to avoid the amplification of ground vibrations. To fulfill the requirements, during the development of the prototype, the structure was designed through topology optimization, static analysis, grouting experiments, dynamic stiffness test and modal analysis, and the rationality of the structure was verified through prototype experiments. During the tunnel installation, the performance of the magnet support system was again verified to be better than the design requirements through test work after installation.

Slides FROAM01 [7.976 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-FROAM01

About •

Received ※ 25 October 2023 — Revised ※ 07 November 2023 — Accepted ※ 17 February 2024 — Issued ※ 12 March 2024

Cite •

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

FROAM02

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

vacuum, simulation, photon, synchrotron

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

Cite •

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

FROAM04

Stability and Vibration Control for High Energy Photon Source in China

ground-motion, ion-source, photon, 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)