合肥光源(HLS-II)屬于第二代同步輻射光源,己經(jīng)投入使用超過30年,在服役期間產(chǎn)出了許多創(chuàng)新性的成果。幾年前,合肥光源進行了一次升級改造工程,該工程提升了合肥光源的運行參數(shù),并更換了磁鐵元件。合肥光源的儲存環(huán)屬于緊湊型,總周長約為66米,主體lattice結(jié)構(gòu)由4個DBA(Double Bend Achromat)單元組成。本論文工作為基于合肥光源的一系列功能拓展與在線實驗研究,主要內(nèi)容包括:1)開發(fā)了一個工作點調(diào)節(jié)系統(tǒng),以有效地在一定范圍內(nèi)調(diào)節(jié)儲存環(huán)的工作點,該工作點調(diào)節(jié)系統(tǒng)調(diào)節(jié)精度較高,對束流的動力學表現(xiàn)影響較小。2)在工作點調(diào)節(jié)系統(tǒng)的基礎(chǔ)上,設計了一個工作點反饋穩(wěn)定系統(tǒng),引入反饋閉環(huán)使工作點在受到外界干擾時可以保持穩(wěn)定狀態(tài)。3)探索了利用合肥光源產(chǎn)生太赫茲輻射的方案,基于合肥光源儲存環(huán)的結(jié)構(gòu)提出了兩種不同的方案。一種是采用低動量緊縮因子的lattice結(jié)構(gòu),另一種是采用激光與電子束相互作用的方法。在儲存環(huán)中,束流橫向運動的工作點對穩(wěn)定運行和注入效率等都有重要的影響。儲存環(huán)在線運行時,應當具備在一定范圍內(nèi)調(diào)整工作點的能力以進行l(wèi)attice補償或者機器研究。為此,可以開發(fā)一套工...

【文章頁數(shù)】：188 頁

【學位級別】：博士

【文章目錄】：
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



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