SAP2023 - List of Keywords (storage-ring)

Paper	Title	Other Keywords	Page
MOPB010	Impact of NEG Coating Thickness and Resistivity on Beam Coupling Impedance	impedance, vacuum, ECR, coupling	30
	T.L. He, Z.H. Bai, W.W. Li, H. Xu USTC/NSRL, Hefei, Anhui, People’s Republic of China
	In diffraction-limited storage rings, non-evaporable getter (NEG) coatings are generally used to assure the ultrahigh vacuum, which, however, also increase the beam coupling impedance that can affect beam dynamics. Ignoring the influence of coating roughness, the impact of NEG coatings on the impedance mainly depends on the coating thickness and resistivity. In this paper, we investigate the impedance characteristics of a round CuCrZr vacuum chamber coated by NEG with different thickness and resistivity.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB010
About •	Received ※ 29 June 2023 — Accepted ※ 11 July 2023 — Issued ※ 12 August 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPB017	Analysis of the Fluctuation of Resonance Driving Terms for Nonlinear Lattice Optimization	sextupole, resonance, lattice, controls	41
	B.F. Wei, Z.H. Bai, G.Y. Feng, J.J. Tan USTC/NSRL, Hefei, Anhui, People’s Republic of China
	Minimizing resonance driving terms (RDTs) of nonlinear magnets is a traditional approach to enlarge the dynamic aperture (DA) of a storage ring. The local cancellation of nonlinear dynamics, which is adopted by some diffraction-limited storage rings, is more effective than the global cancellation. The former has smaller fluctuation of RDTs along the ring. In this paper, the correlation between two kinds of RDT fluctuations is found. The qualitative analysis shows that minimizing the RDT fluctuations is beneficial for controlling the crossing terms and thus enlarging the DA. This qualitative analysis is supported by the statistical analysis of nonlinear solutions of a double-bend achromat lattice.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB017
About •	Received ※ 10 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 11 April 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPB031	Studies on Beam Injection System for Wuhan Advanced Light Source Storage Ring	injection, emittance, dynamic-aperture, septum	73
	Y. Zou, Y. Chen, J.H. He, H.H. Li IAS, Wuhan City, People’s Republic of China
	Wuhan Advanced Light Source is the low-energy 4th generation advanced light source, proposed by Wuhan University. It includes a 1.5 GeV of full-energy LINAC injector, a 180 m circumference of low-emittance storage ring, and a series of state-of-the-art beam lines. The standard 7BA magnetic focusing structure is adopted for the storage ring to lower the beam emittance and the lattice has been well- designed and optimized by multiple-objective genetic algorithm to maximize the dynamic aperture and energy acceptance. The dynamic aperture of the storage ring at injection can reach up to 10 mm in the horizontal plane, which makes the off-axis beam injection method possible. An off-axis beam injection scheme based on the pulsed nonlinear magnet is to be employed for the storage ring. Detailed studies about the beam injection scheme, including the beam optical design, nonlinear magnet design and optimization, have been performed and multi-particle simulations have also been carried out to study the beam injection procedure.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB031
About •	Received ※ 01 July 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 11 July 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPB036	Compact Accelerator Light Source for Industrial Applications	radiation, synchrotron, synchrotron-radiation, injection	82
	Q.L. Zhang, C.L. Li, K. Wang SARI-CAS, Pudong, Shanghai, People’s Republic of China Y. Lu Zhangjiang Lab, Shanghai, People’s Republic of China K. Wang SINAP, Shanghai, People’s Republic of China Y.X. Wang UCAS, Beijing, People’s Republic of China
	Synchrotron radiation has great application potential in industry. However, the large scale of modern light source has limited it from popular use. Compact accelerator light source has many virtues such as small scale, cost effectiveness, maintenance convenience, etc., which make it a main solution of light source application in industry. The idea has attracted great interests from many institutes, and much effort has been put into its research and development. In this paper we present a design of compact accelerator light source with very small scale. The lattice is very simple to ensure its compactness, while the beam parameters remain flexible to industry needs.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB036
About •	Received ※ 30 June 2023 — Revised ※ 10 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 25 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPB037	Generalized Longitudinal Strong Focusing: A Ring-Based Beam Manipulation Technique	radiation, laser, bunching, emittance	85
	Z.Z. Li, X.J. Deng, Z. Pan, C.-X. Tang TUB, Beijing, People’s Republic of China A. Chao SLAC, Menlo Park, California, USA
	Generalized longitudinal strong focusing (GLSF), a ring-based beam manipulation technique, has been proposed to generate steady-state, nanometer-long electron bunches in laser-driven storage rings. Coherent EUV radiation can thus be produced with greatly enhanced power and photon flux, benefiting a wide range of scientific and industrial communities. The GLSF mechanism invokes precise transverse-longitudinal coupling dynamics and exploits the ultralow vertical beam emittance. In a GLSF ring, kW-level coherent EUV radiation is attainable.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB037
About •	Received ※ 28 June 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 20 June 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPB039	Low-Alpha Storage Ring Design for Steady-State Microbunching to Generate EUV Radiation	radiation, lattice, electron, coupling	88
	Z. Pan, A. Chao, X.J. Deng, W.-H. Huang, Z.Z. Li, C.-X. Tang TUB, Beijing, People’s Republic of China
	A new concept is proposed for minimizing the longitudinal emittance of a low momentum compaction factor (low-alpha) storage ring which has the capability to stably store sub-femtosecond electron bunches for the first time. This storage ring is designed for Steady-State microbunching (SSMB) to generate kW level average power EUV radiation. The proposed design approach can be applied to any quasi-isochronous storage rings to yield very high radiation power due to longitudinal coherence of the radiation. We obtain an optimal lattice design by minimizing global and local momentum compaction factors simultaneously and the result of single-particle tracking shows that the electron beam with equilibrium rms bunch length of about 40 nm can be stored in this ring. Nonlinear dynamics is studied for this lattice.
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB039
About •	Received ※ 03 July 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 31 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPB025	Influence of Transverse Distribution of Electron Beam on the Distribution of Proton Beam in the Process of Electron Cooling	electron, proton, simulation, scattering	137
	X.D. Yang IMP/CAS, Lanzhou, People’s Republic of China
	Funding: National Natural Science Foundation of China No.12275325 The electron cooling process of 20GeV proton beam in EicC was simulated for the eight transverse distribution of electron beam with the help of electron cooling simulation code. The transverse cooling time was obtained in the different transverse distribution of electron beam. The final transverse distribution of proton beam was demonstrated. The simulated results reveal that the transverse distribution of electron beam influences the distribution of proton beam in the process of electron cooling. In the future, this idea was expected to apply to the longitudinal distribution of electron beam. The longitudinal distribution of proton beam was attempted to be controlled by the longitudinally modulated electron beam. As a result, the peak current and longitudinal distribution of proton beam will be controlled by the electron beam. The loss of proton beams will be reduced, and the stored lifetime of proton beam in the storage ring will be extended. The intensity of the proton beam will be maintained for a longer time.
	Poster TUPB025 [2.048 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB025
About •	Received ※ 28 June 2023 — Revised ※ 09 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 06 June 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOPB010

Impact of NEG Coating Thickness and Resistivity on Beam Coupling Impedance

impedance, vacuum, ECR, coupling

30

T.L. He, Z.H. Bai, W.W. Li, H. Xu
USTC/NSRL, Hefei, Anhui, People’s Republic of China

In diffraction-limited storage rings, non-evaporable getter (NEG) coatings are generally used to assure the ultrahigh vacuum, which, however, also increase the beam coupling impedance that can affect beam dynamics. Ignoring the influence of coating roughness, the impact of NEG coatings on the impedance mainly depends on the coating thickness and resistivity. In this paper, we investigate the impedance characteristics of a round CuCrZr vacuum chamber coated by NEG with different thickness and resistivity.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB010

About •

Received ※ 29 June 2023 — Accepted ※ 11 July 2023 — Issued ※ 12 August 2024

Cite •

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

MOPB017

Analysis of the Fluctuation of Resonance Driving Terms for Nonlinear Lattice Optimization

sextupole, resonance, lattice, controls

41

B.F. Wei, Z.H. Bai, G.Y. Feng, J.J. Tan
USTC/NSRL, Hefei, Anhui, People’s Republic of China

Minimizing resonance driving terms (RDTs) of nonlinear magnets is a traditional approach to enlarge the dynamic aperture (DA) of a storage ring. The local cancellation of nonlinear dynamics, which is adopted by some diffraction-limited storage rings, is more effective than the global cancellation. The former has smaller fluctuation of RDTs along the ring. In this paper, the correlation between two kinds of RDT fluctuations is found. The qualitative analysis shows that minimizing the RDT fluctuations is beneficial for controlling the crossing terms and thus enlarging the DA. This qualitative analysis is supported by the statistical analysis of nonlinear solutions of a double-bend achromat lattice.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB017

About •

Received ※ 10 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 11 April 2024

Cite •

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

MOPB031

Studies on Beam Injection System for Wuhan Advanced Light Source Storage Ring

injection, emittance, dynamic-aperture, septum

73

Y. Zou, Y. Chen, J.H. He, H.H. Li
IAS, Wuhan City, People’s Republic of China

Wuhan Advanced Light Source is the low-energy 4th generation advanced light source, proposed by Wuhan University. It includes a 1.5 GeV of full-energy LINAC injector, a 180 m circumference of low-emittance storage ring, and a series of state-of-the-art beam lines. The standard 7BA magnetic focusing structure is adopted for the storage ring to lower the beam emittance and the lattice has been well- designed and optimized by multiple-objective genetic algorithm to maximize the dynamic aperture and energy acceptance. The dynamic aperture of the storage ring at injection can reach up to 10 mm in the horizontal plane, which makes the off-axis beam injection method possible. An off-axis beam injection scheme based on the pulsed nonlinear magnet is to be employed for the storage ring. Detailed studies about the beam injection scheme, including the beam optical design, nonlinear magnet design and optimization, have been performed and multi-particle simulations have also been carried out to study the beam injection procedure.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB031

About •

Received ※ 01 July 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 11 July 2023

Cite •

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

MOPB036

Compact Accelerator Light Source for Industrial Applications

radiation, synchrotron, synchrotron-radiation, injection

82

Q.L. Zhang, C.L. Li, K. Wang
SARI-CAS, Pudong, Shanghai, People’s Republic of China
Y. Lu
Zhangjiang Lab, Shanghai, People’s Republic of China
K. Wang
SINAP, Shanghai, People’s Republic of China
Y.X. Wang
UCAS, Beijing, People’s Republic of China

Synchrotron radiation has great application potential in industry. However, the large scale of modern light source has limited it from popular use. Compact accelerator light source has many virtues such as small scale, cost effectiveness, maintenance convenience, etc., which make it a main solution of light source application in industry. The idea has attracted great interests from many institutes, and much effort has been put into its research and development. In this paper we present a design of compact accelerator light source with very small scale. The lattice is very simple to ensure its compactness, while the beam parameters remain flexible to industry needs.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB036

About •

Received ※ 30 June 2023 — Revised ※ 10 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 25 December 2023

Cite •

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

MOPB037

Generalized Longitudinal Strong Focusing: A Ring-Based Beam Manipulation Technique

radiation, laser, bunching, emittance

85

Z.Z. Li, X.J. Deng, Z. Pan, C.-X. Tang
TUB, Beijing, People’s Republic of China
A. Chao
SLAC, Menlo Park, California, USA

Generalized longitudinal strong focusing (GLSF), a ring-based beam manipulation technique, has been proposed to generate steady-state, nanometer-long electron bunches in laser-driven storage rings. Coherent EUV radiation can thus be produced with greatly enhanced power and photon flux, benefiting a wide range of scientific and industrial communities. The GLSF mechanism invokes precise transverse-longitudinal coupling dynamics and exploits the ultralow vertical beam emittance. In a GLSF ring, kW-level coherent EUV radiation is attainable.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB037

About •

Received ※ 28 June 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 20 June 2024

Cite •

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

MOPB039

Low-Alpha Storage Ring Design for Steady-State Microbunching to Generate EUV Radiation

radiation, lattice, electron, coupling

88

Z. Pan, A. Chao, X.J. Deng, W.-H. Huang, Z.Z. Li, C.-X. Tang
TUB, Beijing, People’s Republic of China

A new concept is proposed for minimizing the longitudinal emittance of a low momentum compaction factor (low-alpha) storage ring which has the capability to stably store sub-femtosecond electron bunches for the first time. This storage ring is designed for Steady-State microbunching (SSMB) to generate kW level average power EUV radiation. The proposed design approach can be applied to any quasi-isochronous storage rings to yield very high radiation power due to longitudinal coherence of the radiation. We obtain an optimal lattice design by minimizing global and local momentum compaction factors simultaneously and the result of single-particle tracking shows that the electron beam with equilibrium rms bunch length of about 40 nm can be stored in this ring. Nonlinear dynamics is studied for this lattice.

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB039

About •

Received ※ 03 July 2023 — Revised ※ 08 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 31 December 2023

Cite •

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

TUPB025

Influence of Transverse Distribution of Electron Beam on the Distribution of Proton Beam in the Process of Electron Cooling

electron, proton, simulation, scattering

137

X.D. Yang
IMP/CAS, Lanzhou, People’s Republic of China

Funding: National Natural Science Foundation of China No.12275325
The electron cooling process of 20GeV proton beam in EicC was simulated for the eight transverse distribution of electron beam with the help of electron cooling simulation code. The transverse cooling time was obtained in the different transverse distribution of electron beam. The final transverse distribution of proton beam was demonstrated. The simulated results reveal that the transverse distribution of electron beam influences the distribution of proton beam in the process of electron cooling. In the future, this idea was expected to apply to the longitudinal distribution of electron beam. The longitudinal distribution of proton beam was attempted to be controlled by the longitudinally modulated electron beam. As a result, the peak current and longitudinal distribution of proton beam will be controlled by the electron beam. The loss of proton beams will be reduced, and the stored lifetime of proton beam in the storage ring will be extended. The intensity of the proton beam will be maintained for a longer time.

Poster TUPB025 [2.048 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB025

About •

Received ※ 28 June 2023 — Revised ※ 09 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 06 June 2024

Cite •

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