MEDSI2020 - Classification: Accelerators / Storage Rings

Paper	Title	Page
MOOA02	Experience with the Vacuum System for the First Fourth Generation Light Source: MAX IV	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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MOOA03	Design Study of Vacuum System for a 4th Generation Storage Ring in Korea
	T. Ha PAL, Pohang, Republic of Korea
	It will be presented a new concept vacuum system for a 4th generation storage ring which consists of the distributed pumping and photon absorbing by aluminuim extracted chamber with pill type getters.
	Slides MOOA03 [2.921 MB]
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MOPC11	Discrete Photon Absorbers for the APS-Upgrade Storage Ring Vacuum System	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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MOPC12	A New Magnetic Measurement System for the Future Low Emittance NSLS-II Storage Ring	78
	M. Musardo, T.M. Corwin, F.A. DePaola, L. Doom, R. Faussete, D.A. Harder, S.K. Sharma, T. Tanabe BNL, Upton, New York, USA D. Assell, J. DiMarco Fermilab, Batavia, Illinois, USA C.L. Doose, A.K. Jain ANL, Lemont, Illinois, USA
	Funding: This work was supported by DOE under contract DE-SC0012704 A new magnetic measurement system is under construc-tion at BNL for accurate field harmonic measurements and fiducialization of magnets for a future upgrade of the NSLS- II storage ring. The entire storage ring is envi-sioned to be replaced with a new lattice concept, known as Complex Bend, which superimposes dipole and high-gradient quadrupole fields. The magnetic measurement system will use rotating wire and a PCB rotating coil specifically designed for small-aperture (< 15 mm) high gradient magnets. In this paper we describe in detail the mechanical design and the data acquisition hardware and software.
	Poster MOPC12 [3.102 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC12
About •	paper received ※ 15 July 2021 paper accepted ※ 13 October 2021 issue date ※ 03 November 2021
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MOPC13	Recent Studies on the Vibration Response of NSLS-II Girder Support System	81
	S.K. Sharma, C.J. Spataro BNL, Upton, New York, USA
	The designs of various girder support systems were reviewed recently in a MEDSI School tutorial. A comparison of their horizontal transmissibility values in (2-100) Hz band showed that the NSLS-II girder support system had a lower horizontal transmissibility despite its first natural frequency being the lowest (~30 Hz). Detailed vibration tests and FE analyses have been performed to understand this anomaly and to assess the role of viscoelastic damping pads underneath the NSLS-II girders. The analyses were extended to include harmonic response to model viscoelastic properties and random vibrations to obtain relative motions between the magnets. The results of these new tests and FE analyses are discussed in this paper. S. Sharma, "Storage Ring Girder Issues for Low Emittance Storage Rings", Tutorial, Medsi School 2, Grenoble, France, October 2-25, 2019.
	Poster MOPC13 [0.493 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC13
About •	paper received ※ 20 July 2021 paper accepted ※ 17 September 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	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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MOPC15	Mechanical Design of ALS-U Swap-out Kicker Stripline Electrodes
	T. Oliver LBNL, Berkeley, California, USA
	The Advanced Light Source Upgrade (ALS-U) is an ongoing upgrade of the ALS facility at Lawrence Berkeley National Laboratory. The project utilizes an on-axis swap-out injection between a new Storage Ring (SR) and a full-energy Accumulator Ring (AR) to enable small dynamic apertures to deliver higher brightness. The ALS-U injection scheme plans to use a pulsed stripline kicker design based off of a successful research and development kicker that was installed on the existing ALS Storage Ring. A key challenge in the ALS-U Swap-out kicker is optimizing the distance between the electrodes to balance the benefits of tight spacing to lower required pulser voltage and the challenges to the mechanical design that comes from higher electrode thermal expansion due to increased synchrotron and beam induced heating. Structural and thermal analysis shows that adapting high emissivity coatings, an accommodating mechanical supports design and using molybdenum as an electrode material provide a robust solution.
	Poster MOPC15 [2.041 MB]
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MOPC16	Validation of APS-U Magnet Support Design Analysis and Prediction	89
	Z. Liu, W.G. Jansma, J. Nudell, C.A. Preissner ANL, Lemont, Illinois, USA
	Funding: Work supported by the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The Advanced Photon Source Upgrade (APS-U) accelerator magnets have stringent stability requirement. The project schedule and budget did not allow for full prototyping of the final design. Therefore, the engineers relied on accurate simulation to ensure that the design would meet the specifications. Recently, assembly and free-boundary vibration tests have been done on the first article of the upstream quadrupole Doublet, Longitudinal gradient dipole and Multipole module (DLM-A). The top surface flatness of the girder and the magnet alignment measurement results demonstrate the static positioning requirement of magnet-to-magnet is met. The free-boundary condition modal test results were used to validate the FEA analysis used in the DLM-A design. This validation then confirms the predicted performance of the magnet support system design. Mode shapes and corresponding frequencies from the FEA modal analysis agree with the experimental modal analysis within an acceptable tolerance. The validation approves not only the procedure for accurate modeling of magnet support system that APS-U has developed, but also provides confidence in predicting the accelerator performance. Advanced Photon Source. (2019). APS Upgrade Project Final Design Report (APSU-2.01-RPT-003). Retrieved from https://www.aps.anl.gov/APS-Upgrade/Documents
	Poster MOPC16 [0.807 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC16
About •	paper received ※ 23 July 2021 paper accepted ※ 13 October 2021 issue date ※ 08 November 2021
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TUPA10	Design of Magnet Girder System for Siam Photon Source II	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	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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TUPA13	Research of Bellow Shield Structure Applied to BPM	145
	X.J. Nie, L. Kang, R.H. Liu, S.K. Tian IHEP, Beijing, People’s Republic of China J.X. Chen, H.Y. He, L. Liu, C.J. Ning, A.X. Wang, G.Y. Wang, J.B. Yu, Y.J. Yu, J.S. Zhang, D.H. Zhu IHEP CSNS, Guangdong Province, People’s Republic of China
	The design of shield structure for bellow is an im-portant content for the research of beam position monitor (BPM). The bellow shield structure consists of contact fingers and spring fingers. Several alternative schemes for bellow shield were achieved based on BPM detailed structure. The optimal scheme was achieved by the im-pedance simulation analysis with CST. The dimension of the contact finger was decided based on the length of BPM with the stress condition. The C-type string was manufactured and the spring force was measured as well.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPA13
About •	paper received ※ 20 July 2021 paper accepted ※ 15 October 2021 issue date ※ 29 October 2021
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TUPA14	Stability Study of HEPS Storage Ring Magnet Support
	Z.H. Wang, C.H. Li, H. Wang IHEP, Beijing, People’s Republic of China
	The stability of the beam is affected by the stability of the magnet girder. The High Energy Particle Source requires that the natural frequency of the storage ring magnet girder be better than 54Hz. In order to meet the stability requirement, the connection stiffness of the girder and the fixed stiffness of the plinth are studied in this paper. The main contents of this paper includes: dynamic stiffness test, the prototype of the plinth fixed stiffness test. According to the test results and finite element simulation method, the stability of magnet girder is guaranteed.
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Paper

Title

Page

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

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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MOOA03

Design Study of Vacuum System for a 4th Generation Storage Ring in Korea

T. Ha
PAL, Pohang, Republic of Korea

It will be presented a new concept vacuum system for a 4th generation storage ring which consists of the distributed pumping and photon absorbing by aluminuim extracted chamber with pill type getters.

Slides MOOA03 [2.921 MB]

Export •

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

MOPC11

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

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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MOPC12

A New Magnetic Measurement System for the Future Low Emittance NSLS-II Storage Ring

78

M. Musardo, T.M. Corwin, F.A. DePaola, L. Doom, R. Faussete, D.A. Harder, S.K. Sharma, T. Tanabe
BNL, Upton, New York, USA
D. Assell, J. DiMarco
Fermilab, Batavia, Illinois, USA
C.L. Doose, A.K. Jain
ANL, Lemont, Illinois, USA

Funding: This work was supported by DOE under contract DE-SC0012704
A new magnetic measurement system is under construc-tion at BNL for accurate field harmonic measurements and fiducialization of magnets for a future upgrade of the NSLS- II storage ring. The entire storage ring is envi-sioned to be replaced with a new lattice concept, known as Complex Bend, which superimposes dipole and high-gradient quadrupole fields. The magnetic measurement system will use rotating wire and a PCB rotating coil specifically designed for small-aperture (< 15 mm) high gradient magnets. In this paper we describe in detail the mechanical design and the data acquisition hardware and software.

Poster MOPC12 [3.102 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC12

About •

paper received ※ 15 July 2021 paper accepted ※ 13 October 2021 issue date ※ 03 November 2021

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MOPC13

Recent Studies on the Vibration Response of NSLS-II Girder Support System

81

S.K. Sharma, C.J. Spataro
BNL, Upton, New York, USA

The designs of various girder support systems were reviewed recently in a MEDSI School tutorial*. A comparison of their horizontal transmissibility values in (2-100) Hz band showed that the NSLS-II girder support system had a lower horizontal transmissibility despite its first natural frequency being the lowest (~30 Hz). Detailed vibration tests and FE analyses have been performed to understand this anomaly and to assess the role of viscoelastic damping pads underneath the NSLS-II girders. The analyses were extended to include harmonic response to model viscoelastic properties and random vibrations to obtain relative motions between the magnets. The results of these new tests and FE analyses are discussed in this paper.
*S. Sharma, "Storage Ring Girder Issues for Low Emittance Storage Rings", Tutorial, Medsi School 2, Grenoble, France, October 2-25, 2019.

Poster MOPC13 [0.493 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC13

About •

paper received ※ 20 July 2021 paper accepted ※ 17 September 2021 issue date ※ 01 November 2021

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

MOPC14

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

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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MOPC15

Mechanical Design of ALS-U Swap-out Kicker Stripline Electrodes

T. Oliver
LBNL, Berkeley, California, USA

The Advanced Light Source Upgrade (ALS-U) is an ongoing upgrade of the ALS facility at Lawrence Berkeley National Laboratory. The project utilizes an on-axis swap-out injection between a new Storage Ring (SR) and a full-energy Accumulator Ring (AR) to enable small dynamic apertures to deliver higher brightness. The ALS-U injection scheme plans to use a pulsed stripline kicker design based off of a successful research and development kicker that was installed on the existing ALS Storage Ring. A key challenge in the ALS-U Swap-out kicker is optimizing the distance between the electrodes to balance the benefits of tight spacing to lower required pulser voltage and the challenges to the mechanical design that comes from higher electrode thermal expansion due to increased synchrotron and beam induced heating. Structural and thermal analysis shows that adapting high emissivity coatings, an accommodating mechanical supports design and using molybdenum as an electrode material provide a robust solution.

Poster MOPC15 [2.041 MB]

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MOPC16

Validation of APS-U Magnet Support Design Analysis and Prediction

89

Z. Liu, W.G. Jansma, J. Nudell, C.A. Preissner
ANL, Lemont, Illinois, USA

Funding: Work supported by the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
The Advanced Photon Source Upgrade (APS-U) accelerator magnets have stringent stability requirement*. The project schedule and budget did not allow for full prototyping of the final design. Therefore, the engineers relied on accurate simulation to ensure that the design would meet the specifications. Recently, assembly and free-boundary vibration tests have been done on the first article of the upstream quadrupole Doublet, Longitudinal gradient dipole and Multipole module (DLM-A). The top surface flatness of the girder and the magnet alignment measurement results demonstrate the static positioning requirement of magnet-to-magnet is met. The free-boundary condition modal test results were used to validate the FEA analysis used in the DLM-A design. This validation then confirms the predicted performance of the magnet support system design. Mode shapes and corresponding frequencies from the FEA modal analysis agree with the experimental modal analysis within an acceptable tolerance. The validation approves not only the procedure for accurate modeling of magnet support system that APS-U has developed, but also provides confidence in predicting the accelerator performance.
*Advanced Photon Source. (2019). APS Upgrade Project Final Design Report (APSU-2.01-RPT-003). Retrieved from https://www.aps.anl.gov/APS-Upgrade/Documents

Poster MOPC16 [0.807 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-MOPC16

About •

paper received ※ 23 July 2021 paper accepted ※ 13 October 2021 issue date ※ 08 November 2021

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TUPA10

Design of Magnet Girder System for Siam Photon Source II

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

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

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

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TUPA13

Research of Bellow Shield Structure Applied to BPM

145

X.J. Nie, L. Kang, R.H. Liu, S.K. Tian
IHEP, Beijing, People’s Republic of China
J.X. Chen, H.Y. He, L. Liu, C.J. Ning, A.X. Wang, G.Y. Wang, J.B. Yu, Y.J. Yu, J.S. Zhang, D.H. Zhu
IHEP CSNS, Guangdong Province, People’s Republic of China

The design of shield structure for bellow is an im-portant content for the research of beam position monitor (BPM). The bellow shield structure consists of contact fingers and spring fingers. Several alternative schemes for bellow shield were achieved based on BPM detailed structure. The optimal scheme was achieved by the im-pedance simulation analysis with CST. The dimension of the contact finger was decided based on the length of BPM with the stress condition. The C-type string was manufactured and the spring force was measured as well.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2020-TUPA13

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paper received ※ 20 July 2021 paper accepted ※ 15 October 2021 issue date ※ 29 October 2021

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TUPA14

Stability Study of HEPS Storage Ring Magnet Support

Z.H. Wang, C.H. Li, H. Wang
IHEP, Beijing, People’s Republic of China

The stability of the beam is affected by the stability of the magnet girder. The High Energy Particle Source requires that the natural frequency of the storage ring magnet girder be better than 54Hz. In order to meet the stability requirement, the connection stiffness of the girder and the fixed stiffness of the plinth are studied in this paper. The main contents of this paper includes: dynamic stiffness test, the prototype of the plinth fixed stiffness test. According to the test results and finite element simulation method, the stability of magnet girder is guaranteed.

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