SAP2023 - List of Keywords (emittance)

Paper	Title	Other Keywords	Page
MOPB008	Approximation of Space Charge Effect in the Presence of Longitudinal Magnetic Fields	space-charge, simulation, controls, electron	27
	H.Y. Li, H.B. Chen, Q. Gao, W.H. Gu, J.R. Shi, H. Zha TUB, Beijing, People’s Republic of China
	The space charge effect plays a significant role in the evolution of phase space during beam transport. Applying an external longitudinal magnetic field has been shown to effectively reduce beam expansion through the mechanism of beam rotation. In this article, we present a fast approximation algorithm for estimating the impact of an external magnetic field on beam expansion. The algorithm enables efficient computations and provides insights into controlling the phase space dynamics of the beam in the presence of longitudinal magnetic fields.
	Poster MOPB008 [0.447 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB008
About •	Received ※ 30 June 2023 — Revised ※ 11 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 30 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, storage-ring, 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)

MOPB035	Beam Dynamics Study of a Photo-Injector at Wuhan Light Source	gun, cathode, linac, laser	79
	Z.Y. Dai, Y. Chen, J.B. Guan, J.H. He, Z. Hui, H.H. Li, L.X. Liu, Z.S. Liu, Y. Nie, J. Wang, J.H. Zhong, W. Zhou, Y. Zou IAS, Wuhan City, People’s Republic of China H.C. Shi Zhejiang University, Institute for Fusion Theory and Simulation, Hangzhou, People’s Republic of China
	A photo-injector is under development at Wuhan Light Source (WHLS) to provide beams for the 1.5 GeV storage ring proposed as a fourth-generation synchrotron radiation light source and a future free electron laser (FEL) facility. The photo-injector and the following LINAC will be able to produce electron beams with low emittance (<2 mm·mrad), high bunch charge (~1 nC), small energy spread (<0.5%) , and short bunch length, which meet the requirements of the ring injection and the FEL operation simultaneously. The injector boosts the bunch energy to 100 MeV, which is mainly composed of a photocathode RF gun working at 2998 MHz, two solenoid coils for emittance compensation, and two 3-meter-long 2998 MHz traveling-wave (TW) accelerator units. Beam dynamics optimization of the photo-injector is presented in detail, which has been performed with multi-objective genetic algorithm (MOGA) combining theoretical analysis and ASTRA code. After optimization, the 95% projected transverse emittance has reached as low as 0.45 mm·mrad with an RMS bunch length of about 1.0 mm at a bunch charge of 1 nC.
	Poster MOPB035 [2.643 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB035
About •	Received ※ 28 June 2023 — Accepted ※ 11 July 2023 — Issued ※ 12 November 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, storage-ring, laser, bunching	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)

TUPB024	Electron Cooling for Future High-energy Hadron Accelerators	electron, wiggler, hadron, proton	133
	H. Zhao IMP/CAS, Lanzhou, People’s Republic of China
	Funding: National Natural Science Foundation of China (No. 12275323) Electron cooling is an important method to reduce the emittance and momentum spread of hadron beams, and it has been successfully applied in several facilities around the world. In 2019, the world¿s first RF-based electron cooler (LEReC) was commissioned at BNL for the RHIC BES-II project, and the integrated luminosity of RHIC is finally doubled. In addition, electron cooling is also a must for the future Electron-Ion Collider (BNL EIC). However, the high energy requirement of the electron beam (150 MeV) is far beyond what all present coolers can achieve (<4.3 MeV). For that, an electron ring cooler with strong radiation damping is proposed and designed, in which the non-magnetized and dispersive cooling techniques are applied. In this talk, I will introduce the experimental and simulation results of the two facilities. Mainly, I will introduce several new phenomena that were first observed in LEReC, such as the beam heating effect and the ion beam focusing effect. Besides, some new theories that were developed for the ring cooler will also be discussed.
	Poster TUPB024 [1.769 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB024
About •	Received ※ 04 July 2023 — Revised ※ 09 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 14 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOPB008

Approximation of Space Charge Effect in the Presence of Longitudinal Magnetic Fields

space-charge, simulation, controls, electron

27

H.Y. Li, H.B. Chen, Q. Gao, W.H. Gu, J.R. Shi, H. Zha
TUB, Beijing, People’s Republic of China

The space charge effect plays a significant role in the evolution of phase space during beam transport. Applying an external longitudinal magnetic field has been shown to effectively reduce beam expansion through the mechanism of beam rotation. In this article, we present a fast approximation algorithm for estimating the impact of an external magnetic field on beam expansion. The algorithm enables efficient computations and provides insights into controlling the phase space dynamics of the beam in the presence of longitudinal magnetic fields.

Poster MOPB008 [0.447 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB008

About •

Received ※ 30 June 2023 — Revised ※ 11 July 2023 — Accepted ※ 12 July 2023 — Issued ※ 30 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, storage-ring, 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)

MOPB035

Beam Dynamics Study of a Photo-Injector at Wuhan Light Source

gun, cathode, linac, laser

79

Z.Y. Dai, Y. Chen, J.B. Guan, J.H. He, Z. Hui, H.H. Li, L.X. Liu, Z.S. Liu, Y. Nie, J. Wang, J.H. Zhong, W. Zhou, Y. Zou
IAS, Wuhan City, People’s Republic of China
H.C. Shi
Zhejiang University, Institute for Fusion Theory and Simulation, Hangzhou, People’s Republic of China

A photo-injector is under development at Wuhan Light Source (WHLS) to provide beams for the 1.5 GeV storage ring proposed as a fourth-generation synchrotron radiation light source and a future free electron laser (FEL) facility. The photo-injector and the following LINAC will be able to produce electron beams with low emittance (<2 mm·mrad), high bunch charge (~1 nC), small energy spread (<0.5%) , and short bunch length, which meet the requirements of the ring injection and the FEL operation simultaneously. The injector boosts the bunch energy to 100 MeV, which is mainly composed of a photocathode RF gun working at 2998 MHz, two solenoid coils for emittance compensation, and two 3-meter-long 2998 MHz traveling-wave (TW) accelerator units. Beam dynamics optimization of the photo-injector is presented in detail, which has been performed with multi-objective genetic algorithm (MOGA) combining theoretical analysis and ASTRA code. After optimization, the 95% projected transverse emittance has reached as low as 0.45 mm·mrad with an RMS bunch length of about 1.0 mm at a bunch charge of 1 nC.

Poster MOPB035 [2.643 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB035

About •

Received ※ 28 June 2023 — Accepted ※ 11 July 2023 — Issued ※ 12 November 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, storage-ring, laser, bunching

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)

TUPB024

Electron Cooling for Future High-energy Hadron Accelerators

electron, wiggler, hadron, proton

133

H. Zhao
IMP/CAS, Lanzhou, People’s Republic of China

Funding: National Natural Science Foundation of China (No. 12275323)
Electron cooling is an important method to reduce the emittance and momentum spread of hadron beams, and it has been successfully applied in several facilities around the world. In 2019, the world¿s first RF-based electron cooler (LEReC) was commissioned at BNL for the RHIC BES-II project, and the integrated luminosity of RHIC is finally doubled. In addition, electron cooling is also a must for the future Electron-Ion Collider (BNL EIC). However, the high energy requirement of the electron beam (150 MeV) is far beyond what all present coolers can achieve (<4.3 MeV). For that, an electron ring cooler with strong radiation damping is proposed and designed, in which the non-magnetized and dispersive cooling techniques are applied. In this talk, I will introduce the experimental and simulation results of the two facilities. Mainly, I will introduce several new phenomena that were first observed in LEReC, such as the beam heating effect and the ion beam focusing effect. Besides, some new theories that were developed for the ring cooler will also be discussed.

Poster TUPB024 [1.769 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-SAP2023-TUPB024

About •

Received ※ 04 July 2023 — Revised ※ 09 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 14 December 2023

Cite •

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