MEDSI2020 - List of Keywords (storage-ring)

Paper	Title	Other Keywords	Page
MOOA01	Overcoming Challenges during the Insertion Device Straight Section Component Production and Tuning Phase of the Advanced Photon Source Upgrade	undulator, photon, vacuum, controls	6
	J.E. Lerch ANL, Lemont, Illinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, under Control DE-AC02-06CH11357. The Advanced Photon Source Upgrade (APSU) scope for insertion devices (IDs) and ID vacuum systems is extensive. Thirty-five of the 40 straight sections in the storage ring will be retrofitted with new 4.8-meter-long Superconducting Undulators (SCUs) or a mix of new and reused Hybrid-Permanent Magnet Undulators (HPMUs). All 35 ID straight sections will require new vacuum systems and new HPMU control systems. Production is well underway at multiple manufacturing sites around the world for these components. Simultaneously, ID assembly and HPMU tuning is occurring onsite at Argonne National Laboratory (ANL). In addition to component production and assembly/tuning activities, our team also started the ID swap out program at the Advanced Photon Source (APS) in late 2020. This program allows us to remove HPMUs intended for reuse from the APS storage ring and retune them to meet the APSU magnetic specifications to reduce the tuning workload during dark time. These activities have presented technical and logistical challenges that are as unique as the components themselves. Additionally, the ongoing Covid-19 pandemic presented unforeseen challenges that required new work processes to be created to sustain pace and quality of work while maintaining the high workplace safety standards required at Argonne. This paper will summarize the many challenges we encountered during the course of the project and how they were overcome.
	Slides MOOA01 [4.995 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOOA01
About •	paper received ※ 14 July 2021 paper accepted ※ 29 October 2021 issue date ※ 06 November 2021
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MOOA02	Experience with the Vacuum System for the First Fourth Generation Light Source: MAX IV	vacuum, operation, electron, synchrotron	10
	E. Al-Dmour, M.J. Grabski, K. Åhnberg MAX IV Laboratory, Lund University, Lund, Sweden
	The 3 GeV electron storage ring of the MAX IV laboratory is the first storage-ring-based synchrotron radiation facility with small aperture and with the inner surface of almost all the vacuum chambers along its circumference coated with non-evaporable getter (NEG) thin film. This concept implies challenges during the whole project phase from design into operation. The fast conditioning of the vacuum system and over five years of reliable accelerator operation have demonstrated that the chosen design proved to be good and does not impose limits on the operation. A summary of the vacuum system design, production, installation and performance is presented.
	Slides MOOA02 [3.706 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOOA02
About •	paper received ※ 29 July 2021 paper accepted ※ 30 August 2021 issue date ※ 30 October 2021
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MOPB09	The Design and Manufacturing of Superconducting Undulator Magnets for the Advanced Photon Source Upgrade	magnet-design, undulator, interface, photon	41
	E.A. Anliker, Q.B. Hasse, Y. Ivanyushenkov, M. Kasa, Y. Shiroyanagi ANL, Lemont, Illinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science under Control DE-AC02-06CH11357. The Advanced Photon Source Upgrade (APSU) will include four full length Superconducting Undulators (SCUs). These SCUs require new undulator magnets to achieve the required performance of the new machine. The magnets are fabricated from low carbon steel and wound with NbTi superconductor. To meet the needs of the users of the new machine these magnets will be manufactured in different lengths and magnetic periods to accommodate SCUs in both inline and canted configurations. Because the magnets for the SCUs cannot be shimmed like permanent magnet undulators, they need to have very tight tolerances for the poles and the winding grooves. This poses unique manufacturing and fabrication challenges. This paper will cover the design of the 1.9 m long magnets for the inline SCUs, their measurement data, lessons learned from manufacturing, and an overview of design changes that were made for the magnets to be used in the canted SCU configurations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPB09
About •	paper received ※ 21 July 2021 paper accepted ※ 29 October 2021 issue date ※ 05 November 2021
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MOPB13	Automated Mechanical Inspection and Calibration of Insertion Devices in APS Storage Ring	operation, insertion-device, insertion, feedback	50
	N.R. Weir, E. Gubbels ANL, Lemont, Illinois, USA
	Funding: Argonne National Laboratory under Contract No. DE-AC02-06CH11357. A novel technique has been developed to automatically inspect and calibrate the 53 permanent magnet insertion devices in the Advanced Photon Source (APS) storage ring. This technique employs standard frequency domain analysis to create easily identifiable signatures in an actionable format. We will discuss the mechanisms and actions taken behind various observed trends and its application for continuous monitoring and predictive maintenance of these devices. This technique has enabled predictive maintenance and provided new insights into optimizing device performance.
	Poster MOPB13 [1.783 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPB13
About •	paper received ※ 26 July 2021 paper accepted ※ 01 October 2021 issue date ※ 30 October 2021
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MOPB15	A Comparison of Front-End Design Requirements	SRF, photon, vacuum, wiggler	53
	S.K. Sharma BNL, Upton, New York, USA
	Front ends of the NSLS-II storage ring have numerous design requirements to ensure equipment and personal safety aspects of their designs. These design requirements, especially many pertaining to ray tracings, have gradually become overly stringent and a review is underway to simplify them for building future front ends. As a part of this effort we have assembled the front-end design requirements used in several other light sources. In this paper the assembled design requirements are discussed in comparison with those currently in use at NSLS-II.
	Poster MOPB15 [0.433 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPB15
About •	paper received ※ 20 July 2021 paper accepted ※ 01 October 2021 issue date ※ 10 November 2021
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MOPC11	Discrete Photon Absorbers for the APS-Upgrade Storage Ring Vacuum System	photon, vacuum, interface, electron	75
	O.K. Mulvany, B. Billett, B. Brajuskovic, J.A. Carter, A. McElderry, R.R. Swanson ANL, Lemont, Illinois, USA
	Funding: This work is supported by the U.S. Department of Energy, Office of Science under Contract No. DE-AC02-06CH11357. The Advanced Photon Source Upgrade storage ring arc vacuum system features a diverse set of photon beam-intercepting components, including five discrete photon absorbers and a series of small-aperture vacuum chambers that shadow downstream components. The discrete photon absorbers, typically fabricated from electron beam-welded GlidCop AL-15, are subject to heat loads ranging from approximately 170 to 3400 watts, with a peak power density up to approximately 610 W/mm2 at normal incidence. Four of the five photon absorber designs are housed in vacuum chambers, including three that are mounted to the antechambers of curved aluminum extrusion-based L-bend vacuum chambers and one that is mounted to a stainless steel vacuum-pumping cross. Furthermore, two of the photon absorbers that are mounted to L-bend vacuum chambers are equipped with position-adjustment mechanisms, which are necessitated by the challenging design and fabrication of the curved vacuum chambers. The fifth photon absorber, unlike the rest, is a brazed design that is integral in sealing the vacuum system and intercepts approximately 170 watts. Each photon absorber design was optimized with thermal-structural finite element analyses while ensuring functional and spatial requirements were met. Some of these requirements include meeting internal high-heat-load component design criteria, respecting challenging component interfaces and alignment requirements, and minimizing impedance effects. Furthermore, photon beam scattering effects called for the use of scattering shields on three designs to minimize potential heating of vacuum chambers. This paper details the careful balance of functionality and manufacturability, and the overall design process followed to achieve the final designs.
	Poster MOPC11 [8.305 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC11
About •	paper received ※ 19 July 2021 paper accepted ※ 13 October 2021 issue date ※ 01 November 2021
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MOPC14	Vacuum Pumping Crosses and Keyhole Vacuum Chambers for the APS-Upgrade Storage Ring Vacuum System	vacuum, photon, extraction, synchrotron	85
	A. McElderry, B. Billett, J.A. Carter, O.K. Mulvany ANL, Lemont, Illinois, USA
	Funding: This work is supported by the U.S. Department of Energy, Office of Science under Contract No. DE-AC02-06CH11357. The Advanced Photon Source Upgrade (APS-U) storage ring arc consists of a diverse system of nar-row-aperture chambers in compact magnet assemblies with gaps often less than 1 mm. The vacuum system contains two stainless steel pumping crosses and two keyhole-shaped vacuum chambers, as well as eight non-evaporative getter (NEG) coated aluminum cham-bers and crosses per sector (40 total sectors). Each chamber contains a 22 mm diameter electron beam aperture and the keyhole components also feature a photon extraction antechamber. Each design balances functionality, manufacturability, and installation needs. The design process was aided by a flexible CAD skeleton model which allowed for easier adjustments. Synchrotron radiation heat loads applied to inline chamber photon absorbers and photon extraction beam envelopes were determined via a 3D ray tracing CAD model. The inline photon absorber and the key-hole shapes were optimized using iterative thermal-structural FEA. Focus was put on mesh quality to mod-el the <0.5 mm tall synchrotron radiation heat load absorbed across the length of the chamber to verify cooling parameters. The design process also required careful routing of the water system and vacuum pumps. The designs incorporate beam physics con-straints of the inline absorbers, cross-housed discrete absorbers, and pumping slots.
	Poster MOPC14 [11.188 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC14
About •	paper received ※ 16 July 2021 paper accepted ※ 13 October 2021 issue date ※ 03 November 2021
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TUPA10	Design of Magnet Girder System for Siam Photon Source II	alignment, simulation, photon, synchrotron	138
	O. Utke Synchrotron Light Research Institute (SLRI), Muang District, Thailand S. Chaichuay, S. Klinkhieo, S. Pongampai, K. Sittisard, S. Srichan SLRI, Nakhon Ratchasima, Thailand
	The new Siam Photon Source II (SPS-II) storage ring is designed with a circumference of 327.502 m. It consists of 14 DTBA cell, where each cell requires 6 magnet girders. For the new storage ring of SPS II we developed a magnet girder system which uses wedgemounts for the precision alignment. The girder alignment uses a 3-2-1 alignment method and requires 3 wedgemounts to control Z direction, 2 wedgemounts to control Y-direction and 1 wedgemount for the X-direction. The magnet alignment is based on mechanical tolerances. Therefore, the girders top plate is prepared with precision surfaces with a flatness tolerance of 30 µm. During the development process of the girder system deformation and vibration FEA analysis were carried out and the results were used to improve the design regarding low deformation and high natural frequencies. In this paper FEA analysis results are presented as well as the design of the girder, pedestal and its wedgemount based alignment system.
	Poster TUPA10 [2.242 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPA10
About •	paper received ※ 09 July 2021 paper accepted ※ 15 October 2021 issue date ※ 08 November 2021
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TUPA12	The Design and Prototype Test for the Tunnel Foundation of High Energy Photon Source	ground-motion, site, photon, emittance	141
	F. Yan, X.P. Jing, G.P. Lin, J. Qiu, G. Xu, N.C. Zhou IHEP, Beijing, People’s Republic of China A.Z. Lu, Y.L. Xing, Z.G. Xu, Y.S. Zhang CEEDI, Beijing, People’s Republic of China
	High Energy Photon Source (HEPS) is being built in China with challenging beam stability requirements. To fulfil the 25 nm ground motion restriction on the storage ring tunnel slab, two prototype slabs with different design schemes were constructed on the HEPS site. The first scheme adopted a 1 m reinforced concrete with replace-ment layer of a 1 m sand & stone underneath. The second scheme employed an extra 5 m grouting layer below the previously mentioned two layers. A series of tests had been carried out. The prototype slab with grouting layer is testified to have comparable vibration level with the bare ground, which is under 25 nm without traffic inside the HEPS campus, while the vibration level is amplified a lot on the other prototype slab. However, it is hard to make the grouting layer homogeneously under the kilo-metre-scale tunnel and besides the cost is unacceptable for 5 m grouting with such a large scale. The finalized design is fixed to be a 1 m reinforced concrete slab and 3 m replacement layer underneath using plain concrete. In this paper, the details of the prototype slab test results will be presented.
	Poster TUPA12 [2.300 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPA12
About •	paper received ※ 20 July 2021 paper accepted ※ 17 September 2021 issue date ※ 08 November 2021
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WEPB06	Mechanical Design of the Booster to Storage Ring Transfer (BTS) Line for APS Upgrade	quadrupole, dipole, emittance, vacuum	279
	J. Liu, M. Borland, T.K. Clute, J.S. Downey, M.S. Jaski, U. Wienands ANL, Lemont, Illinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357 APS Upgrade selected the horizontal injection scheme which requires exchanging the x and y emittances in the BTS transport line through a series of six skew quadrupoles, as well as matching the beam parameters to the APS Upgrade storage ring through two dipoles and a conventional pulsed septum. This paper presents the layout of this BTS line section in the storage ring tunnel and key components in this section including the mechanical design of dipole magnet, quadrupole and skew quad magnets, the vacuum system, the diagnostics system, and the supports. Finally, detailed mechanical design of this BTS line section in modules and some consideration for fabrication and installation are addressed.
	Poster WEPB06 [1.133 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPB06
About •	paper received ※ 26 July 2021 paper accepted ※ 19 October 2021 issue date ※ 03 November 2021
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WEPB07	Magnet Module Assembly for the APS Upgrade	alignment, vacuum, site, photon	283
	K.J. Volin, R. Bechtold, A.K. Jain, W.G. Jansma, Z. Liu, J. Nudell, C.A. Preissner ANL, Lemont, Illinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science under Control DE-AC02-06CH11357. With APSU well into the procurement phase of the project, the APSU assembly team has completed a "DLMA Practice Assembly", comprising of the support system, and all magnets required to complete a module. The purpose of this test was to verify assembly and documentation procedures, ensure proper fit between mating components, and verify that alignment specifications can be met. The results of this exercise are presented. Though this test was completed on the Argonne site, work continues on building 981, the APSU offsite warehouse, where our first production plinths and girders have been shipped, and where production modules will be assembled. This space has been outfitted by Argonne contractors and APSU Assembly technicians with 1) 5 parallel DLM/FODO module assembly stations, each complete with a 3 tn. overhead crane, retractable cleanroom, staging tables, and tools, and 2) 2 QMQ module assembly stations each complete with a 5 tn. gantry crane, assembly support stands, staging tables, and tools. An overview of this production assembly space is also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPB07
About •	paper received ※ 07 September 2021 paper accepted ※ 29 October 2021 issue date ※ 06 November 2021
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THOB03	Innovative and Biologically Inspired Petra IV Girder Design	synchrotron, simulation, radiation, emittance	360
	S. Andresen Alfred-Wegener-Institut, Bremerhaven, Germany N. Meyners, D. Thoden DESY, Hamburg, Germany
	Funding: Deutsches Elektronen Synchrotron (DESY), a research centre of the Helmholtz Association - Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research DESY (Deutsches Elektronen Synchrotron) is currently expanding the PETRA III storage ring X-ray radiation source to a high-resolution 3D X-ray microscope providing all length scales from the atom to millimeters. This PETRA IV project involves an optimization of the girder magnet assemblies to reduce the impact of ambient vibrations on the particle beam. For this purpose, an innovative and biologically inspired girder structure has been developed. Beforehand, a large parametric study analyzed the impact of different loading and boundary conditions on the eigenfrequencies of a magnet-girder assembly. Subsequently, the girder design process was generated, which combined topology optimizations with biologically inspired structures (e.g., complex Voronoi combs, hierarchical structures, and smooth connections) and cross section optimizations using genetic algorithms to obtain a girder magnet assembly with high eigenfrequencies, a high stiffness, and reduced weight. The girder was successfully manufactured from gray cast iron and first vibration experiments have been conducted to validate the simulations.
	Slides THOB03 [4.169 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-THOB03
About •	paper received ※ 28 July 2021 paper accepted ※ 28 September 2021 issue date ※ 08 November 2021
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Paper

Title

Other Keywords

Page

Overcoming Challenges during the Insertion Device Straight Section Component Production and Tuning Phase of the Advanced Photon Source Upgrade

undulator, photon, vacuum, controls

6

J.E. Lerch
ANL, Lemont, Illinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Control DE-AC02-06CH11357.
The Advanced Photon Source Upgrade (APSU) scope for insertion devices (IDs) and ID vacuum systems is extensive. Thirty-five of the 40 straight sections in the storage ring will be retrofitted with new 4.8-meter-long Superconducting Undulators (SCUs) or a mix of new and reused Hybrid-Permanent Magnet Undulators (HPMUs). All 35 ID straight sections will require new vacuum systems and new HPMU control systems. Production is well underway at multiple manufacturing sites around the world for these components. Simultaneously, ID assembly and HPMU tuning is occurring onsite at Argonne National Laboratory (ANL). In addition to component production and assembly/tuning activities, our team also started the ID swap out program at the Advanced Photon Source (APS) in late 2020. This program allows us to remove HPMUs intended for reuse from the APS storage ring and retune them to meet the APSU magnetic specifications to reduce the tuning workload during dark time. These activities have presented technical and logistical challenges that are as unique as the components themselves. Additionally, the ongoing Covid-19 pandemic presented unforeseen challenges that required new work processes to be created to sustain pace and quality of work while maintaining the high workplace safety standards required at Argonne. This paper will summarize the many challenges we encountered during the course of the project and how they were overcome.

Slides MOOA01 [4.995 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOOA01

About •

paper received ※ 14 July 2021 paper accepted ※ 29 October 2021 issue date ※ 06 November 2021

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MOOA02

Experience with the Vacuum System for the First Fourth Generation Light Source: MAX IV

vacuum, operation, electron, synchrotron

10

E. Al-Dmour, M.J. Grabski, K. Åhnberg
MAX IV Laboratory, Lund University, Lund, Sweden

The 3 GeV electron storage ring of the MAX IV laboratory is the first storage-ring-based synchrotron radiation facility with small aperture and with the inner surface of almost all the vacuum chambers along its circumference coated with non-evaporable getter (NEG) thin film. This concept implies challenges during the whole project phase from design into operation. The fast conditioning of the vacuum system and over five years of reliable accelerator operation have demonstrated that the chosen design proved to be good and does not impose limits on the operation. A summary of the vacuum system design, production, installation and performance is presented.

Slides MOOA02 [3.706 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOOA02

About •

paper received ※ 29 July 2021 paper accepted ※ 30 August 2021 issue date ※ 30 October 2021

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MOPB09

The Design and Manufacturing of Superconducting Undulator Magnets for the Advanced Photon Source Upgrade

magnet-design, undulator, interface, photon

41

E.A. Anliker, Q.B. Hasse, Y. Ivanyushenkov, M. Kasa, Y. Shiroyanagi
ANL, Lemont, Illinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science under Control DE-AC02-06CH11357.
The Advanced Photon Source Upgrade (APSU) will include four full length Superconducting Undulators (SCUs). These SCUs require new undulator magnets to achieve the required performance of the new machine. The magnets are fabricated from low carbon steel and wound with NbTi superconductor. To meet the needs of the users of the new machine these magnets will be manufactured in different lengths and magnetic periods to accommodate SCUs in both inline and canted configurations. Because the magnets for the SCUs cannot be shimmed like permanent magnet undulators, they need to have very tight tolerances for the poles and the winding grooves. This poses unique manufacturing and fabrication challenges. This paper will cover the design of the 1.9 m long magnets for the inline SCUs, their measurement data, lessons learned from manufacturing, and an overview of design changes that were made for the magnets to be used in the canted SCU configurations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPB09

About •

paper received ※ 21 July 2021 paper accepted ※ 29 October 2021 issue date ※ 05 November 2021

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MOPB13

Automated Mechanical Inspection and Calibration of Insertion Devices in APS Storage Ring

operation, insertion-device, insertion, feedback

50

N.R. Weir, E. Gubbels
ANL, Lemont, Illinois, USA

Funding: Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
A novel technique has been developed to automatically inspect and calibrate the 53 permanent magnet insertion devices in the Advanced Photon Source (APS) storage ring. This technique employs standard frequency domain analysis to create easily identifiable signatures in an actionable format. We will discuss the mechanisms and actions taken behind various observed trends and its application for continuous monitoring and predictive maintenance of these devices. This technique has enabled predictive maintenance and provided new insights into optimizing device performance.

Poster MOPB13 [1.783 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPB13

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paper received ※ 26 July 2021 paper accepted ※ 01 October 2021 issue date ※ 30 October 2021

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MOPB15

A Comparison of Front-End Design Requirements

SRF, photon, vacuum, wiggler

53

S.K. Sharma
BNL, Upton, New York, USA

Front ends of the NSLS-II storage ring have numerous design requirements to ensure equipment and personal safety aspects of their designs. These design requirements, especially many pertaining to ray tracings, have gradually become overly stringent and a review is underway to simplify them for building future front ends. As a part of this effort we have assembled the front-end design requirements used in several other light sources. In this paper the assembled design requirements are discussed in comparison with those currently in use at NSLS-II.

Poster MOPB15 [0.433 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPB15

About •

paper received ※ 20 July 2021 paper accepted ※ 01 October 2021 issue date ※ 10 November 2021

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MOPC11

Discrete Photon Absorbers for the APS-Upgrade Storage Ring Vacuum System

photon, vacuum, interface, electron

75

O.K. Mulvany, B. Billett, B. Brajuskovic, J.A. Carter, A. McElderry, R.R. Swanson
ANL, Lemont, Illinois, USA

Funding: This work is supported by the U.S. Department of Energy, Office of Science under Contract No. DE-AC02-06CH11357.
The Advanced Photon Source Upgrade storage ring arc vacuum system features a diverse set of photon beam-intercepting components, including five discrete photon absorbers and a series of small-aperture vacuum chambers that shadow downstream components. The discrete photon absorbers, typically fabricated from electron beam-welded GlidCop AL-15, are subject to heat loads ranging from approximately 170 to 3400 watts, with a peak power density up to approximately 610 W/mm2 at normal incidence. Four of the five photon absorber designs are housed in vacuum chambers, including three that are mounted to the antechambers of curved aluminum extrusion-based L-bend vacuum chambers and one that is mounted to a stainless steel vacuum-pumping cross. Furthermore, two of the photon absorbers that are mounted to L-bend vacuum chambers are equipped with position-adjustment mechanisms, which are necessitated by the challenging design and fabrication of the curved vacuum chambers. The fifth photon absorber, unlike the rest, is a brazed design that is integral in sealing the vacuum system and intercepts approximately 170 watts. Each photon absorber design was optimized with thermal-structural finite element analyses while ensuring functional and spatial requirements were met. Some of these requirements include meeting internal high-heat-load component design criteria, respecting challenging component interfaces and alignment requirements, and minimizing impedance effects. Furthermore, photon beam scattering effects called for the use of scattering shields on three designs to minimize potential heating of vacuum chambers. This paper details the careful balance of functionality and manufacturability, and the overall design process followed to achieve the final designs.

Poster MOPC11 [8.305 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC11

About •

paper received ※ 19 July 2021 paper accepted ※ 13 October 2021 issue date ※ 01 November 2021

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MOPC14

Vacuum Pumping Crosses and Keyhole Vacuum Chambers for the APS-Upgrade Storage Ring Vacuum System

vacuum, photon, extraction, synchrotron

85

A. McElderry, B. Billett, J.A. Carter, O.K. Mulvany
ANL, Lemont, Illinois, USA

Funding: This work is supported by the U.S. Department of Energy, Office of Science under Contract No. DE-AC02-06CH11357.
The Advanced Photon Source Upgrade (APS-U) storage ring arc consists of a diverse system of nar-row-aperture chambers in compact magnet assemblies with gaps often less than 1 mm. The vacuum system contains two stainless steel pumping crosses and two keyhole-shaped vacuum chambers, as well as eight non-evaporative getter (NEG) coated aluminum cham-bers and crosses per sector (40 total sectors). Each chamber contains a 22 mm diameter electron beam aperture and the keyhole components also feature a photon extraction antechamber. Each design balances functionality, manufacturability, and installation needs. The design process was aided by a flexible CAD skeleton model which allowed for easier adjustments. Synchrotron radiation heat loads applied to inline chamber photon absorbers and photon extraction beam envelopes were determined via a 3D ray tracing CAD model. The inline photon absorber and the key-hole shapes were optimized using iterative thermal-structural FEA. Focus was put on mesh quality to mod-el the <0.5 mm tall synchrotron radiation heat load absorbed across the length of the chamber to verify cooling parameters. The design process also required careful routing of the water system and vacuum pumps. The designs incorporate beam physics con-straints of the inline absorbers, cross-housed discrete absorbers, and pumping slots.

Poster MOPC14 [11.188 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC14

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paper received ※ 16 July 2021 paper accepted ※ 13 October 2021 issue date ※ 03 November 2021

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TUPA10

Design of Magnet Girder System for Siam Photon Source II

alignment, simulation, photon, synchrotron

138

O. Utke
Synchrotron Light Research Institute (SLRI), Muang District, Thailand
S. Chaichuay, S. Klinkhieo, S. Pongampai, K. Sittisard, S. Srichan
SLRI, Nakhon Ratchasima, Thailand

The new Siam Photon Source II (SPS-II) storage ring is designed with a circumference of 327.502 m. It consists of 14 DTBA cell, where each cell requires 6 magnet girders. For the new storage ring of SPS II we developed a magnet girder system which uses wedgemounts for the precision alignment. The girder alignment uses a 3-2-1 alignment method and requires 3 wedgemounts to control Z direction, 2 wedgemounts to control Y-direction and 1 wedgemount for the X-direction. The magnet alignment is based on mechanical tolerances. Therefore, the girders top plate is prepared with precision surfaces with a flatness tolerance of 30 µm. During the development process of the girder system deformation and vibration FEA analysis were carried out and the results were used to improve the design regarding low deformation and high natural frequencies. In this paper FEA analysis results are presented as well as the design of the girder, pedestal and its wedgemount based alignment system.

Poster TUPA10 [2.242 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPA10

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paper received ※ 09 July 2021 paper accepted ※ 15 October 2021 issue date ※ 08 November 2021

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TUPA12

The Design and Prototype Test for the Tunnel Foundation of High Energy Photon Source

ground-motion, site, photon, emittance

141

F. Yan, X.P. Jing, G.P. Lin, J. Qiu, G. Xu, N.C. Zhou
IHEP, Beijing, People’s Republic of China
A.Z. Lu, Y.L. Xing, Z.G. Xu, Y.S. Zhang
CEEDI, Beijing, People’s Republic of China

High Energy Photon Source (HEPS) is being built in China with challenging beam stability requirements. To fulfil the 25 nm ground motion restriction on the storage ring tunnel slab, two prototype slabs with different design schemes were constructed on the HEPS site. The first scheme adopted a 1 m reinforced concrete with replace-ment layer of a 1 m sand & stone underneath. The second scheme employed an extra 5 m grouting layer below the previously mentioned two layers. A series of tests had been carried out. The prototype slab with grouting layer is testified to have comparable vibration level with the bare ground, which is under 25 nm without traffic inside the HEPS campus, while the vibration level is amplified a lot on the other prototype slab. However, it is hard to make the grouting layer homogeneously under the kilo-metre-scale tunnel and besides the cost is unacceptable for 5 m grouting with such a large scale. The finalized design is fixed to be a 1 m reinforced concrete slab and 3 m replacement layer underneath using plain concrete. In this paper, the details of the prototype slab test results will be presented.

Poster TUPA12 [2.300 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPA12

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paper received ※ 20 July 2021 paper accepted ※ 17 September 2021 issue date ※ 08 November 2021

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WEPB06

Mechanical Design of the Booster to Storage Ring Transfer (BTS) Line for APS Upgrade

quadrupole, dipole, emittance, vacuum

279

J. Liu, M. Borland, T.K. Clute, J.S. Downey, M.S. Jaski, U. Wienands
ANL, Lemont, Illinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357
APS Upgrade selected the horizontal injection scheme which requires exchanging the x and y emittances in the BTS transport line through a series of six skew quadrupoles, as well as matching the beam parameters to the APS Upgrade storage ring through two dipoles and a conventional pulsed septum. This paper presents the layout of this BTS line section in the storage ring tunnel and key components in this section including the mechanical design of dipole magnet, quadrupole and skew quad magnets, the vacuum system, the diagnostics system, and the supports. Finally, detailed mechanical design of this BTS line section in modules and some consideration for fabrication and installation are addressed.

Poster WEPB06 [1.133 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPB06

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paper received ※ 26 July 2021 paper accepted ※ 19 October 2021 issue date ※ 03 November 2021

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WEPB07

Magnet Module Assembly for the APS Upgrade

alignment, vacuum, site, photon

283

K.J. Volin, R. Bechtold, A.K. Jain, W.G. Jansma, Z. Liu, J. Nudell, C.A. Preissner
ANL, Lemont, Illinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science under Control DE-AC02-06CH11357.
With APSU well into the procurement phase of the project, the APSU assembly team has completed a "DLMA Practice Assembly", comprising of the support system, and all magnets required to complete a module. The purpose of this test was to verify assembly and documentation procedures, ensure proper fit between mating components, and verify that alignment specifications can be met. The results of this exercise are presented. Though this test was completed on the Argonne site, work continues on building 981, the APSU offsite warehouse, where our first production plinths and girders have been shipped, and where production modules will be assembled. This space has been outfitted by Argonne contractors and APSU Assembly technicians with 1) 5 parallel DLM/FODO module assembly stations, each complete with a 3 tn. overhead crane, retractable cleanroom, staging tables, and tools, and 2) 2 QMQ module assembly stations each complete with a 5 tn. gantry crane, assembly support stands, staging tables, and tools. An overview of this production assembly space is also presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-WEPB07

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paper received ※ 07 September 2021 paper accepted ※ 29 October 2021 issue date ※ 06 November 2021

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THOB03

Innovative and Biologically Inspired Petra IV Girder Design

synchrotron, simulation, radiation, emittance

360

S. Andresen
Alfred-Wegener-Institut, Bremerhaven, Germany
N. Meyners, D. Thoden
DESY, Hamburg, Germany

Funding: Deutsches Elektronen Synchrotron (DESY), a research centre of the Helmholtz Association - Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
DESY (Deutsches Elektronen Synchrotron) is currently expanding the PETRA III storage ring X-ray radiation source to a high-resolution 3D X-ray microscope providing all length scales from the atom to millimeters. This PETRA IV project involves an optimization of the girder magnet assemblies to reduce the impact of ambient vibrations on the particle beam. For this purpose, an innovative and biologically inspired girder structure has been developed. Beforehand, a large parametric study analyzed the impact of different loading and boundary conditions on the eigenfrequencies of a magnet-girder assembly. Subsequently, the girder design process was generated, which combined topology optimizations with biologically inspired structures (e.g., complex Voronoi combs, hierarchical structures, and smooth connections) and cross section optimizations using genetic algorithms to obtain a girder magnet assembly with high eigenfrequencies, a high stiffness, and reduced weight. The girder was successfully manufactured from gray cast iron and first vibration experiments have been conducted to validate the simulations.

Slides THOB03 [4.169 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-THOB03

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paper received ※ 28 July 2021 paper accepted ※ 28 September 2021 issue date ※ 08 November 2021

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