MEDSI2023 - List of Authors (Ma, Y.S.)

Paper	Title	Page
TUKAM02	CEPC Vacuum System Development and Status
	Y.S. Ma IHEP, Beijing, People’s Republic of China
	Circular Electron Positron Collider (CEPC) is an e⁺e⁻ Higgs factory aimed at producing Higgs/W/Z bosons and top quarks, with the goal of discovering new physics beyond the Standard Model. The CEPC project was proposed in 2012, shortly after the discovery of the Higgs boson. The vacuum system of CEPC accelerator includes the LINAC, Booster, collider rings, and MDI (Machine Detector Interface). The Conceptual Design Report (CDR) was published in 2018, and the Technical Design Report (TDR) is expected to be published in the coming weeks. In terms of vacuum technology, RF shielding bellows, extruded copper and aluminum vacuum pipes have been designed and carried out. NEG coating of 200nm is employed to suppress e-cloud of positron ring and absorb residual gases for both e⁺,e⁻ rings, simultaneously.
	Slides TUKAM02 [6.356 MB]
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THPPP029	Technologies Concerning Metal Seals of the UHV System for Accelerators	322
	H.Y. He, Y.S. Ma IHEP, Beijing, People’s Republic of China L. Liu, P.C. Wang IHEP CSNS, Guangdong Province, People’s Republic of China B. Tan Institute of High Energy Physics, CAS, Guangdong, People’s Republic of China
	Reviewed the domestic research on structural design and sealing function principle of the metal seals, wildly used in the Ultra High Vacuum (UHV) system for accelerators. Analyzed and summarized the key technologies concerning the material, contact forms, machining process and test methods of sealing performance. The study will become the basis of designing, machining and quality measuring for the ultra-vacuum metal seals. It provided the foundation for generating seals standards to promote the development of vacuum technology application.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP029
About •	Received ※ 27 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 26 November 2023
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THPPP041	Design of HEPS Booster Synchronous Radiation Light Extraction System
	J.M. Liu, S.M. Liu, X.Y. Sun, B. Tan, P.C. Wang DNSC, Dongguan, People’s Republic of China Y.S. Ma, D.C. Zhu IHEP, Beijing, People’s Republic of China B.L. Zhu IHEP CSNS, Guangdong Province, People’s Republic of China
	The HEPS Booster synchronous radiation light extraction system is a bending magnet source designed specifically for Booster beam size monitor, consisting of a vacuum chamber, diaphragm, and reflector. The function of the system is to provide specific synchrotron radiation light for the optical imaging system to measure the beam size. At present, the system has been successfully manufactured and installed. This article will introduce its design, thermal analysis, and manufacturing accuracy.
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THPPP047	NEG Film Development and Massive Coating production for HEPS	343
	Y.S. Ma, H. Dong, D.Z. Guo, P. He, F. Sun, Y.C. Yang IHEP, People’s Republic of China T. Huang IHEP CSNS, Guangdong Province, People’s Republic of China
	Massive production facilities of NEG coated vacuum chambers have been developed for HEPS in Huairou, Beijing, which based on the NEG coating prototypes of HEPS-TF. The facilities can achieve simultaneous coating of 16~20 vacuum chambers of HEPS including irregular shaped vacuum chambers. The pumping per-formance of the NEG coated vacuum chambers has been measured by test facilities. After heating at 200°C for 24 hours, the highest pumping speed of H₂ is about 0.65 l/scm², and the highest capacity of CO is about 1.89×10^-5 mbar·L/cm². The lifetime is more than 20 cycles of air exposure and re-activation. The pumping performance meets the design requirements of HEPS. Currently the NEG coated vacuum chambers are applied to the storage ring of HEPS.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP047
About •	Received ※ 02 November 2023 — Revised ※ 09 November 2023 — Accepted ※ 22 November 2023 — Issued ※ 18 July 2024
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THPPP052	Design and Development of Coated Chamber for In-Air Insertion Devices	352
	P.C. Wang, Y. Wang USTC/NSRL, Hefei, Anhui, People’s Republic of China H. Dong, Y.S. Ma, Y.G. Wang, L. Zhang IHEP, Beijing, People’s Republic of China J.M. Liu, S.M. Liu, X.Y. Sun DNSC, Dongguan, People’s Republic of China B. Tan Institute of High Energy Physics, CAS, Guangdong, People’s Republic of China B.L. Zhu IHEP CSNS, Guangdong Province, People’s Republic of China
	The insertion devices ¿ID¿is an important guarantee for further improving the performance of the light source to meet the needs of different users. For in-air ID (undulator, wiggler, etc.), the magnetic structure is in the air, and the vacuum chamber is in the middle of the magnetic structure to ensure the normal operation of the beam. In order to increase the magnetic field strength, the magnetic gap is generally relatively small. Factors such as small setting space, high precision, and low conductance all pose challenges to the design and processing of vacuum chamber. This paper introduces the development process of the vacuum chamber prototype of the coating type ID for the China ’s first diffraction-limited light source HEPS. The simultaneous analysis and vacuum pressure distribution calculation of the ID are carried out, and the NEG coating scheme is proposed as an more economical means to obtain ultra-high vacuum. The prototype NEG coating progress is introduced.
DOI •	reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP052
About •	Received ※ 02 November 2023 — Revised ※ 10 November 2023 — Accepted ※ 12 November 2023 — Issued ※ 18 July 2024
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Paper

Title

Page

TUKAM02

CEPC Vacuum System Development and Status

Y.S. Ma
IHEP, Beijing, People’s Republic of China

Circular Electron Positron Collider (CEPC) is an e⁺e⁻ Higgs factory aimed at producing Higgs/W/Z bosons and top quarks, with the goal of discovering new physics beyond the Standard Model. The CEPC project was proposed in 2012, shortly after the discovery of the Higgs boson. The vacuum system of CEPC accelerator includes the LINAC, Booster, collider rings, and MDI (Machine Detector Interface). The Conceptual Design Report (CDR) was published in 2018, and the Technical Design Report (TDR) is expected to be published in the coming weeks. In terms of vacuum technology, RF shielding bellows, extruded copper and aluminum vacuum pipes have been designed and carried out. NEG coating of 200nm is employed to suppress e-cloud of positron ring and absorb residual gases for both e⁺,e⁻ rings, simultaneously.

Slides TUKAM02 [6.356 MB]

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

THPPP029

Technologies Concerning Metal Seals of the UHV System for Accelerators

322

H.Y. He, Y.S. Ma
IHEP, Beijing, People’s Republic of China
L. Liu, P.C. Wang
IHEP CSNS, Guangdong Province, People’s Republic of China
B. Tan
Institute of High Energy Physics, CAS, Guangdong, People’s Republic of China

Reviewed the domestic research on structural design and sealing function principle of the metal seals, wildly used in the Ultra High Vacuum (UHV) system for accelerators. Analyzed and summarized the key technologies concerning the material, contact forms, machining process and test methods of sealing performance. The study will become the basis of designing, machining and quality measuring for the ultra-vacuum metal seals. It provided the foundation for generating seals standards to promote the development of vacuum technology application.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP029

About •

Received ※ 27 October 2023 — Revised ※ 05 November 2023 — Accepted ※ 08 November 2023 — Issued ※ 26 November 2023

Cite •

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

THPPP041

Design of HEPS Booster Synchronous Radiation Light Extraction System

J.M. Liu, S.M. Liu, X.Y. Sun, B. Tan, P.C. Wang
DNSC, Dongguan, People’s Republic of China
Y.S. Ma, D.C. Zhu
IHEP, Beijing, People’s Republic of China
B.L. Zhu
IHEP CSNS, Guangdong Province, People’s Republic of China

The HEPS Booster synchronous radiation light extraction system is a bending magnet source designed specifically for Booster beam size monitor, consisting of a vacuum chamber, diaphragm, and reflector. The function of the system is to provide specific synchrotron radiation light for the optical imaging system to measure the beam size. At present, the system has been successfully manufactured and installed. This article will introduce its design, thermal analysis, and manufacturing accuracy.

Cite •

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

THPPP047

NEG Film Development and Massive Coating production for HEPS

343

Y.S. Ma, H. Dong, D.Z. Guo, P. He, F. Sun, Y.C. Yang
IHEP, 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)

THPPP052

Design and Development of Coated Chamber for In-Air Insertion Devices

352

P.C. Wang, Y. Wang
USTC/NSRL, Hefei, Anhui, People’s Republic of China
H. Dong, Y.S. Ma, Y.G. Wang, L. Zhang
IHEP, Beijing, People’s Republic of China
J.M. Liu, S.M. Liu, X.Y. Sun
DNSC, Dongguan, People’s Republic of China
B. Tan
Institute of High Energy Physics, CAS, Guangdong, People’s Republic of China
B.L. Zhu
IHEP CSNS, Guangdong Province, People’s Republic of China

The insertion devices ¿ID¿is an important guarantee for further improving the performance of the light source to meet the needs of different users. For in-air ID (undulator, wiggler, etc.), the magnetic structure is in the air, and the vacuum chamber is in the middle of the magnetic structure to ensure the normal operation of the beam. In order to increase the magnetic field strength, the magnetic gap is generally relatively small. Factors such as small setting space, high precision, and low conductance all pose challenges to the design and processing of vacuum chamber. This paper introduces the development process of the vacuum chamber prototype of the coating type ID for the China ’s first diffraction-limited light source HEPS. The simultaneous analysis and vacuum pressure distribution calculation of the ID are carried out, and the NEG coating scheme is proposed as an more economical means to obtain ultra-high vacuum. The prototype NEG coating progress is introduced.

DOI •

reference for this paper ※ doi:10.18429/JACoW-MEDSI2023-THPPP052

About •

Received ※ 02 November 2023 — Revised ※ 10 November 2023 — Accepted ※ 12 November 2023 — Issued ※ 18 July 2024

Cite •

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