基于合肥光源储存环的工作点稳定性与太赫兹辐射的研究
发布时间：2023-04-09 03:10
合肥光源(HLS-II)属于第二代同步辐射光源,己经投入使用超过30年,在服役期间产出了许多创新性的成果。几年前,合肥光源进行了一次升级改造工程,该工程提升了合肥光源的运行参数,并更换了磁铁元件。合肥光源的储存环属于紧凑型,总周长约为66米,主体lattice结构由4个DBA(Double Bend Achromat)单元组成。本论文工作为基于合肥光源的一系列功能拓展与在线实验研究,主要内容包括:1)开发了一个工作点调节系统,以有效地在一定范围内调节储存环的工作点,该工作点调节系统调节精度较高,对束流的动力学表现影响较小。2)在工作点调节系统的基础上,设计了一个工作点反馈稳定系统,引入反馈闭环使工作点在受到外界干扰时可以保持稳定状态。3)探索了利用合肥光源产生太赫兹辐射的方案,基于合肥光源储存环的结构提出了两种不同的方案。一种是采用低动量紧缩因子的lattice结构,另一种是采用激光与电子束相互作用的方法。在储存环中,束流横向运动的工作点对稳定运行和注入效率等都有重要的影响。储存环在线运行时,应当具备在一定范围内调整工作点的能力以进行lattice补偿或者机器研究。为此,可以开发一套工...
【文章页数】：188 页
【学位级别】：博士
【文章目录】：
Abstract
List of Abbreviations and Symbols
Acknowledgements
1 Introduction
1.1 Motivation
1.1.1 Overview of storage ring based synchrotron light sources
1.1.2 Motivation of the work at Hefei Light Source-Ⅱ
1.2 Highlights in the dissertation
1.3 Outline of the dissertation
2 Review of Single Particle Dynamics in Electromagnetic Field
2.1 The Hamiltonian of A Charged Particle in Electromagnetic Field
2.2 Transverse Dynamics
2.2.1 The betatron motion
2.2.2 Zeroth order error-dipole error and first order dispersion
2.2.3 First order error-quadrupole error and first order chromaticity
2.2.4 Linear coupling of a storage ring
2.2.5 Resonance and dynamic aperture
2.3 Longitudinal dynamics
2.3.1 Longitudinal phase stability
2.3.2 Fundamental description and stable bucket
2.4 Synchrotron radiation
2.4.1 The Lienard-Wiechert potential
2.4.2 Coherent synchrotron radiation
2.5 Summary
AppendixA: Multipole Expansion for Static Magnetic Fields
AppendixB: Hamiltonian dynamics and a symplectic matrix
3 Tune Knob for the HLS-Ⅱ Storage Ring 50
3.1 Tune adjustment for a storage ring
3.1.1 Tune knob using the tune response matrix method
3.1.2 Tune adjustment using the step-by-step lattice tweaking
3.1.3 Optimization method for designing tune knob
3.2 Development of the tune knob for the HLS-Ⅱ storage ring
3.2.1 Tune knob design
3.2.2 Impacts on beam dynamics
3.2.3 Impact on the horizontal η function
3.2.4 Impact on the dynamic aperture
3.2.5 A tune change survey of the tune knob
3.2.6 Summary
3.3 Online experiments of the tune knob in the HLS-Ⅱ storage ring
3.3.1 Tune measurement and fitting
3.3.2 Online tune knob measurement and calibration
3.3.3 Measurement of transverse linear coupling
3.4 Chromaticity knob using the response matrix method
3.4.1 The chromaticity response matrix
3.4.2 2-D chromaticity survey with the chromaticity knobs
3.4.3 Impact on the dynamic aperture change
3.5 Summary
4 Tune Feedback System for the HLS-Ⅱ Storage Ring
4.1 Overview
4.2 Development of a tune feedback system
4.2.1 Tune feedback using a PID feedback loop
4.2.2 Machine control system and beam diagnostics
4.3 Design of the tune feedback system for the HLS-Ⅱ storage ring
4.3.1 The NSGA-Ⅱ based multi-objective genetic algorithm
4.3.2 Determination of the feedback coefficients
4.4 Online experiments
4.4.1 Measurement of tune stability in the HLS-Ⅱ storage ring innormal operation
4.4.2 Impact on the tune stability in normal operation
4.4.3 Comparing with the simulation by varying the wiggler gap
4.4.4 Tune feedback for user operation
4.5 Summary
5 Proposals of Terahertz Generation at HLS-Ⅱ 119
5.1 Coherent synchrotron radiation and chicane structure
5.1.1 Incoherent and coherent synchrotron radiation
5.1.2 Magnetic chicane
5.2 Low-alpha lattice
5.2.1 PSO algorithm
5.2.2 Path to the low-alpha lattice and its optics
5.2.3 Optimization of dynamic aperture and second-order momen-tum compaction factor
5.2.4 Operation parameters and collective instabilities
5.3 Laser-bunch interaction
5.3.1 Introduction
5.3.2 Coherent synchrotron radiation form factor
5.3.3 Laser bunch slicing method
5.3.4 Simulation and results
5.4 Summary
6 Summary and Future Work
6.1 Tune knob development for the HLS-Ⅱ storage ring
6.2 Tune feedback system development for the HLS-Ⅱ storage ring
6.3 Exploration of terahertz radiation in the HLS-Ⅱ storage ring
6.4 Future work
Bibliography
Biography
中文摘要
本文编号：3786954
【文章页数】：188 页
【学位级别】：博士
【文章目录】：
Abstract
List of Abbreviations and Symbols
Acknowledgements
1 Introduction
1.1 Motivation
1.1.1 Overview of storage ring based synchrotron light sources
1.1.2 Motivation of the work at Hefei Light Source-Ⅱ
1.2 Highlights in the dissertation
1.3 Outline of the dissertation
2 Review of Single Particle Dynamics in Electromagnetic Field
2.1 The Hamiltonian of A Charged Particle in Electromagnetic Field
2.2 Transverse Dynamics
2.2.1 The betatron motion
2.2.2 Zeroth order error-dipole error and first order dispersion
2.2.3 First order error-quadrupole error and first order chromaticity
2.2.4 Linear coupling of a storage ring
2.2.5 Resonance and dynamic aperture
2.3 Longitudinal dynamics
2.3.1 Longitudinal phase stability
2.3.2 Fundamental description and stable bucket
2.4 Synchrotron radiation
2.4.1 The Lienard-Wiechert potential
2.4.2 Coherent synchrotron radiation
2.5 Summary
AppendixA: Multipole Expansion for Static Magnetic Fields
AppendixB: Hamiltonian dynamics and a symplectic matrix
3 Tune Knob for the HLS-Ⅱ Storage Ring 50
3.1 Tune adjustment for a storage ring
3.1.1 Tune knob using the tune response matrix method
3.1.2 Tune adjustment using the step-by-step lattice tweaking
3.1.3 Optimization method for designing tune knob
3.2 Development of the tune knob for the HLS-Ⅱ storage ring
3.2.1 Tune knob design
3.2.2 Impacts on beam dynamics
3.2.3 Impact on the horizontal η function
3.2.4 Impact on the dynamic aperture
3.2.5 A tune change survey of the tune knob
3.2.6 Summary
3.3 Online experiments of the tune knob in the HLS-Ⅱ storage ring
3.3.1 Tune measurement and fitting
3.3.2 Online tune knob measurement and calibration
3.3.3 Measurement of transverse linear coupling
3.4 Chromaticity knob using the response matrix method
3.4.1 The chromaticity response matrix
3.4.2 2-D chromaticity survey with the chromaticity knobs
3.4.3 Impact on the dynamic aperture change
3.5 Summary
4 Tune Feedback System for the HLS-Ⅱ Storage Ring
4.1 Overview
4.2 Development of a tune feedback system
4.2.1 Tune feedback using a PID feedback loop
4.2.2 Machine control system and beam diagnostics
4.3 Design of the tune feedback system for the HLS-Ⅱ storage ring
4.3.1 The NSGA-Ⅱ based multi-objective genetic algorithm
4.3.2 Determination of the feedback coefficients
4.4 Online experiments
4.4.1 Measurement of tune stability in the HLS-Ⅱ storage ring innormal operation
4.4.2 Impact on the tune stability in normal operation
4.4.3 Comparing with the simulation by varying the wiggler gap
4.4.4 Tune feedback for user operation
4.5 Summary
5 Proposals of Terahertz Generation at HLS-Ⅱ 119
5.1 Coherent synchrotron radiation and chicane structure
5.1.1 Incoherent and coherent synchrotron radiation
5.1.2 Magnetic chicane
5.2 Low-alpha lattice
5.2.1 PSO algorithm
5.2.2 Path to the low-alpha lattice and its optics
5.2.3 Optimization of dynamic aperture and second-order momen-tum compaction factor
5.2.4 Operation parameters and collective instabilities
5.3 Laser-bunch interaction
5.3.1 Introduction
5.3.2 Coherent synchrotron radiation form factor
5.3.3 Laser bunch slicing method
5.3.4 Simulation and results
5.4 Summary
6 Summary and Future Work
6.1 Tune knob development for the HLS-Ⅱ storage ring
6.2 Tune feedback system development for the HLS-Ⅱ storage ring
6.3 Exploration of terahertz radiation in the HLS-Ⅱ storage ring
6.4 Future work
Bibliography
Biography
中文摘要
本文编号：3786954
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