在FLASH装置上1.3GHz超导加速腔内的基于高阶模的束团和加速腔诊断方法研究

目录

声明

Abstract

Contents

List of Tables

List of Figures

1 Introduction

1．1 Linac-based Free-Electron Lasers

1．2 FLASH

1．3 Cavity type monitors

1．3．1 Cavity-type BPMs

1．3．2 EOM and RF cavity-based BAMs

1．4 HOM-based diagnostics in TESLA cavities

1．5 Outline of the thesis

2 Cavity Basics

2．1 Theory of electromagnetic fields

2．1．1 Maxwell's equations

2．1．2 Plane electromagnetic waves in free space

2．1．3 Circular waveguide

2．1．4 Cylindrical cavity

2．2 TESLA superconducting cavity

2．2．1 Superconductivity

2．2．2 Shape of the cell

2．2．3 Multi-cell cavity

3 HOMs in 1．3 GHz TESLA Cavities

3．1 Wakefields

3．2 RF parameters

3．3 Eigenmode simulations

3．4 HOM spectra measurement

4 HOM-based Beam Position and Cavity Offset Measurement

4．1 Introduction to HOMBPM

4．2 Data analysis method

4．2．1 Experimental setup

4．2．2 Singular Value Decomposition

4．2．3 Signal fitting method

4．3 Measurement results

4．3．2 HOMBPM resolution

4．3．3 Measurement during normal operation

4．3．4 Cavity offset and dipole polarization measurements

5 HOM-based Cavity Tilt Measurement

5．1 Measurement principle

5．2 Simulation

5．2．2 Simulation results

5．3 Cavity tilt measurement

5．3．1 Experimental setup

5．3．2 Beam offset calibration

5．3．3 Cavity tilt results

6 HOM-based Beam Phase Measurement

6．1 Introduction to the LLRF system

6．2 Prillciple of the HOMBPhM

6．2．1 Measurement setup

6．2．2 Signal processing

6．2．3 Resolution dependence

6．3 Beam phase measurement results

6．3．2 Long-term phase monitoring

7 Summary and OutlooK

7．1 Summary

7．2 Outlook

Bibliography

Appendix

Acknowledgements

Biography

摘要