儲存環(huán)縱向反饋腔設(shè)計與基于橫向反饋系統(tǒng)的束流實驗研究
發(fā)布時間：2021-07-26 20:52
為了獲得高亮度的同步輻射光源,合肥儲存環(huán)采用多束團(tuán)運行模式。多束團(tuán)運行模式帶來的耦合束團(tuán)不穩(wěn)定性將會嚴(yán)重影響光源的性能,包括束流丟失、注入效率變差和束流品質(zhì)的整體下降。多束團(tuán)不穩(wěn)定性可以用一些方法來緩解,比如增加自然阻尼（在更高的能量上運行）,降低束流流強(qiáng)和增加朗道阻尼。然而,這些方法不足以用來穩(wěn)定低能量、高流強(qiáng)運行模式下的束流。為了更有效的抑制束流不穩(wěn)定性,合肥儲存環(huán)將在其升級改造項目中建立一套主動式的儲存環(huán)反饋系統(tǒng),包括縱向反饋系統(tǒng)與橫向反饋系統(tǒng)。作為縱向反饋系統(tǒng)的重要組成部分,我們需要一個具有一定帶寬和阻抗的縱向反饋激勵腔。論文匯報了我們在合肥儲存環(huán)縱向反饋腔物理設(shè)計方面的工作,以及在設(shè)計過程中開發(fā)出的高性能縱向反饋腔調(diào)整優(yōu)化技術(shù)。為了抑制電子束流的不穩(wěn)定性,杜克儲存環(huán)發(fā)展了一套數(shù)字的逐束團(tuán)橫向反饋系統(tǒng)。該系統(tǒng)能夠很好地抑制多束團(tuán)運行時橫向束流的不穩(wěn)定性。目前,在一般的機(jī)器運行中,這套系統(tǒng)還沒有被用到。為了充分發(fā)掘該系統(tǒng)的應(yīng)用潛能,我們利用它開發(fā)了一些束流診斷工具,特別是基于橫向反饋的工作點測量技術(shù)。使用該工作點測量技術(shù),我們還能夠進(jìn)行快速的束流色品測量�；跈M向反饋系統(tǒng)的束流工...
【文章來源】：中國科學(xué)技術(shù)大學(xué)安徽省 211工程院校 985工程院校
【文章頁數(shù)】：169 頁
【學(xué)位級別】：博士
【文章目錄】：
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
本文編號：3304350
【文章來源】：中國科學(xué)技術(shù)大學(xué)安徽省 211工程院校 985工程院校
【文章頁數(shù)】：169 頁
【學(xué)位級別】：博士
【文章目錄】：
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
本文編號：3304350
本文鏈接：http://sikaile.net/projectlw/hkxlw/3304350.html
最近更新
教材專著
