储存环纵向反馈腔设计与基于横向反馈系统的束流实验研究
发布时间：2021-07-26 20:52
为了获得高亮度的同步辐射光源,合肥储存环采用多束团运行模式。多束团运行模式带来的耦合束团不稳定性将会严重影响光源的性能,包括束流丢失、注入效率变差和束流品质的整体下降。多束团不稳定性可以用一些方法来缓解,比如增加自然阻尼（在更高的能量上运行）,降低束流流强和增加朗道阻尼。然而,这些方法不足以用来稳定低能量、高流强运行模式下的束流。为了更有效的抑制束流不稳定性,合肥储存环将在其升级改造项目中建立一套主动式的储存环反馈系统,包括纵向反馈系统与横向反馈系统。作为纵向反馈系统的重要组成部分,我们需要一个具有一定带宽和阻抗的纵向反馈激励腔。论文汇报了我们在合肥储存环纵向反馈腔物理设计方面的工作,以及在设计过程中开发出的高性能纵向反馈腔调整优化技术。为了抑制电子束流的不稳定性,杜克储存环发展了一套数字的逐束团横向反馈系统。该系统能够很好地抑制多束团运行时横向束流的不稳定性。目前,在一般的机器运行中,这套系统还没有被用到。为了充分发掘该系统的应用潜能,我们利用它开发了一些束流诊断工具,特别是基于横向反馈的工作点测量技术。使用该工作点测量技术,我们还能够进行快速的束流色品测量。基于横向反馈系统的束流工...
【文章来源】：中国科学技术大学安徽省 211工程院校 985工程院校
【文章页数】：169 页
【学位级别】：博士
【文章目录】：
Abstract
List of Tables
List of Figures
Listof Abbreviations and Symbols
Acknowledgements
1 Introduction
1.1 Motivation
1.1.1 Storage rings and synchrotron radiation light sources
1.1.2 Beam instabilities and feedback systems
1.2 Overview of the dissertation
1.2.1 Design of longitudinal feedback kicker for HLS-Ⅱ storage ring
1.2.2 Development of TFB based beam diagnostics at the Duke stor-age ring
2 Physics Design of Longitudinal Feedback Kicker for HLS-Ⅱ Storage Ring
2.1 Longitudinal feedback kicker cavity for storage rings
2.2 Design requirements of the HLS-Ⅱ LFB kicker
2.2.1 Design specifications
2.2.2 Estimated dimensions of the HLS LFB kicker
2.2.3 Simulation code
2.3 Preliminary design of the LFB kicker with round beam pipes
2.3.1 Model of the LFB kicker for the HLS-Ⅱ storage ring
2.3.2 Calculation of the dependency between the kicker performance and geometric parameters
2.3.3 Simulation results of the quarter cavity model
2.3.4 Simulation results of the full cavity model
2.4 Design of the HLS-Ⅱ LFB kicker with transition
2.4.1 Transition method
2.4.2 Physics design of the HLS LFB kicker
3 Tuning and Optimization Methods for Designing a High-Performance LFB Kicker
3.1 Equivalent analysis of an RF cavity
3.1.1 RF cavity as a harmonic oscillator
3.1.2 RF cavity as a lumped circuit
3.2 Effect of using nose cones and cavity perturbations
3.2.1 Shunt impedance with nose cones
3.2.2 Cavity perturbation
3.3 Optimization of the LFB kicker with transition parts
3.3.1 Fitting of the dependencies between the kicker geometry and performance
3.3.2 Cavity tuning using Newton's method
3.3.3 Mechanical tolerance
3.4 Higher-order modes of the LFB kicker
3.4.1 Consideration of the frequency range
3.4.2 Identification method of the HOMs for an RF cavity
3.4.3 HOMs of the HLS LFB kicker
4 Development of Electron Beam Diagnostics Based on Transverse Feedback System at Duke Storage Ring
4.1 Transverse feedback system at the Duke storage ring
4.1.1 Configuration of the Duke TFB system
4.1.2 Timing of the TFB system
4.2 Development of TFB based beam diagnostics
4.2.1 Slow tune measurement technique
4.2.2 Fast tune measurement technique
4.2.3 Chromaticity measurement system
4.3 Fitting method for the tune measurement and tune spread
4.3.1 Lorentzian fitting for the tune measurement
4.3.2 Tune spread
4.4 Multibunch tune measurement
5 Machine Study Using TFB Based Beam Diagnostics at Duke Stor-age Ring
5.1 Impedance measurement for charged particle accelerators
5.1.1 Loss factors and effective impedances
5.1.2 Impedance measurement methods
5.2 Betatron frequency shifts due to transverse impedance
5.3 Measurement of tune shifts with beam current at the Duke storage ring
5.4 Dependence of wakefields and impedances on the offset of beam orbit
5.4.1 Generalized wakes and impedances
5.4.2 Tune shifts with beam orbit in OK-4 FEL wigglers at the Duke storage ring
5.5 Study of tune stability at Duke storage ring
5.6 Tune knob and chromaticity knob calibration
6 Summary and Conclusion
6.1 Design of the longitudinal feedback kicker
6.2 Development and applications of the TFB based beam diagnostics
6.3 Future research
Bibliography
Biography
PUBLICATIONS
中文概要
本文编号：3304350
【文章来源】：中国科学技术大学安徽省 211工程院校 985工程院校
【文章页数】：169 页
【学位级别】：博士
【文章目录】：
Abstract
List of Tables
List of Figures
Listof Abbreviations and Symbols
Acknowledgements
1 Introduction
1.1 Motivation
1.1.1 Storage rings and synchrotron radiation light sources
1.1.2 Beam instabilities and feedback systems
1.2 Overview of the dissertation
1.2.1 Design of longitudinal feedback kicker for HLS-Ⅱ storage ring
1.2.2 Development of TFB based beam diagnostics at the Duke stor-age ring
2 Physics Design of Longitudinal Feedback Kicker for HLS-Ⅱ Storage Ring
2.1 Longitudinal feedback kicker cavity for storage rings
2.2 Design requirements of the HLS-Ⅱ LFB kicker
2.2.1 Design specifications
2.2.2 Estimated dimensions of the HLS LFB kicker
2.2.3 Simulation code
2.3 Preliminary design of the LFB kicker with round beam pipes
2.3.1 Model of the LFB kicker for the HLS-Ⅱ storage ring
2.3.2 Calculation of the dependency between the kicker performance and geometric parameters
2.3.3 Simulation results of the quarter cavity model
2.3.4 Simulation results of the full cavity model
2.4 Design of the HLS-Ⅱ LFB kicker with transition
2.4.1 Transition method
2.4.2 Physics design of the HLS LFB kicker
3 Tuning and Optimization Methods for Designing a High-Performance LFB Kicker
3.1 Equivalent analysis of an RF cavity
3.1.1 RF cavity as a harmonic oscillator
3.1.2 RF cavity as a lumped circuit
3.2 Effect of using nose cones and cavity perturbations
3.2.1 Shunt impedance with nose cones
3.2.2 Cavity perturbation
3.3 Optimization of the LFB kicker with transition parts
3.3.1 Fitting of the dependencies between the kicker geometry and performance
3.3.2 Cavity tuning using Newton's method
3.3.3 Mechanical tolerance
3.4 Higher-order modes of the LFB kicker
3.4.1 Consideration of the frequency range
3.4.2 Identification method of the HOMs for an RF cavity
3.4.3 HOMs of the HLS LFB kicker
4 Development of Electron Beam Diagnostics Based on Transverse Feedback System at Duke Storage Ring
4.1 Transverse feedback system at the Duke storage ring
4.1.1 Configuration of the Duke TFB system
4.1.2 Timing of the TFB system
4.2 Development of TFB based beam diagnostics
4.2.1 Slow tune measurement technique
4.2.2 Fast tune measurement technique
4.2.3 Chromaticity measurement system
4.3 Fitting method for the tune measurement and tune spread
4.3.1 Lorentzian fitting for the tune measurement
4.3.2 Tune spread
4.4 Multibunch tune measurement
5 Machine Study Using TFB Based Beam Diagnostics at Duke Stor-age Ring
5.1 Impedance measurement for charged particle accelerators
5.1.1 Loss factors and effective impedances
5.1.2 Impedance measurement methods
5.2 Betatron frequency shifts due to transverse impedance
5.3 Measurement of tune shifts with beam current at the Duke storage ring
5.4 Dependence of wakefields and impedances on the offset of beam orbit
5.4.1 Generalized wakes and impedances
5.4.2 Tune shifts with beam orbit in OK-4 FEL wigglers at the Duke storage ring
5.5 Study of tune stability at Duke storage ring
5.6 Tune knob and chromaticity knob calibration
6 Summary and Conclusion
6.1 Design of the longitudinal feedback kicker
6.2 Development and applications of the TFB based beam diagnostics
6.3 Future research
Bibliography
Biography
PUBLICATIONS
中文概要
本文编号：3304350
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