Phase Space Dynamics in Plasma Based Wakefield Acceleration de Xinlu Xu

Phase Space Dynamics in Plasma Based Wakefield Acceleration: Springer Theses

en Limba Engleză Paperback – 3 ian 2021

This book explores several key issues in beam phase space dynamics in plasma-based wakefield accelerators. It reveals the phase space dynamics of ionization-based injection methods by identifying two key phase mixing processes. Subsequently, the book proposes a two-color laser ionization injection scheme for generating high-quality beams, and assesses it using particle-in-cell (PIC) simulations. To eliminate emittance growth when the beam propagates between plasma accelerators and traditional accelerator components, a method using longitudinally tailored plasma structures as phase space matching components is proposed. Based on the aspects above, a preliminary design study on X-ray free-electron lasers driven by plasma accelerators is presented. Lastly, an important type of numerical noise—the numerical Cherenkov instabilities in particle-in-cell codes—is systematically studied.

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Specificații

ISBN-13: 9789811523830
ISBN-10: 9811523835
Ilustrații: XIII, 129 p. 52 illus., 50 illus. in color.
Dimensiuni: 155 x 235 mm
Greutate: 0.21 kg
Ediția:1st ed. 2020
Editura: Springer Nature Singapore
Colecția Springer
Seria Springer Theses

Locul publicării:Singapore, Singapore

Cuprins

Chapter 1 Introduction

1.1 Introduction

1.2 Plasma Based Acceleration

1.3 Particle-in-Cell Simulations

1.4 Motivation and Outline

Chapter 2 Phase Space Dynamics of Injected Electron Beams in Ionization Injection

2.1 Introduction

2.2 The Photoionization Process

2.3 The Residual Momentum

2.3.1 Initial Momentum from the Tunneling Ionization

2.3.2 The Momentum from the Lasers: Longitudinal Injection

2.3.3 The Momentum from the Lasers: Transverse Injection

2.3.4 The Thermal Emittance

2.4 Single Particle Motion in the Nonlinear Wake

2.5 Transverse Phase Mixing

2.5.1 Emittance Evolution: Growth and Oscillation in the Injection Stage

2.5.2 Emittance Evolution: Decrease and Regrowth in the Acceleration Stage

2.5.3 A Phenomenological Model

2.5.4 Comparisons with PIC Simulations

2.6 Longitudinal Phase Mixing

2.6.1 The Trapping Condition

2.6.2 Longitudinal Phase Mixing

2.7 Space Charge Effects

2.8 The Two-Color Ionization Injection

2.8.1 The Emittance in A Single Laser Case

2.8.2 The Two-Color Ionization Injection: Longitudinal Injection

2.8.3 The Two-Color Ionization Injection: Transverse Injection

2.9 Intrinsic Phase Space Discretization in Laser Triggered Ionization Injection

2.9.1 Single Laser Pulse Case

2.9.2 Beam Driver with a Laser Injector

2.10 Summary

3.1 Introduction

3.2 The Emittance Growth between Stages

3.2.1 Emittance Growth in Free Space Drifting

3.2.2 Emittance Growth in A Uniform Focusing Field

3.3 Theoretical Analysis of A Matching Plasma

3.3.1 How to Design the Matching Plasma?

3.3.2 The Effect of the Energy Spread

3.4 Verification by PIC Simulations

3.4.1 Matching Between Two-Stage LWFAs

3.4.2 Matching in External Injection

3.4.3 Matching between LWFAs and the Quadrupoles

3.5 Summary

Chapter 4 X-FELs Driven by Plasma Based Accelerators

4.1 Introduction

4.1.1 The Basic Principles of FELs<

4.1.2 The Challenges and Opportunities of X-FELs Driven by plasma Based Accelerators

4.2 X-FEL Driven by A Two-Stage LWFA

4.2.1 Simulation of the Injector Stage

4.2.2 Simulation of the Accelerator Stage

4.2.3 Simulation of the Undulator Stage

4.3 Conclusions

Chapter 5 Numerical Instability due to Relativistic Plasma Drift in EM-PIC Simulations

5.1 Introduction

5.1.1 The Boosted Frame Simulations of LWFA

5.1.2 Numerical Noise Induced by Relativistic Plasma Drift in PIC Codes

5.2 Numerical Dispersion Relation for Cold Plasma Drift

5.2.1 Derivation of Dispersion Relation

5.2.2 Elements of Dispersion Relation Tensor

5.2.3 EM Modes, and Wave-Particle Resonance

5.3 Numerical Instability Induced by Relativistic Plasma Drift for the Yee Solver

5.3.1 Theoretical Analysis of the 2D Dispersion Relation

5.3.2 Simulation Study of the Instability

5.4 Asymptotic Expression for Instability Growth Rate

5.4.1 Derivation of Asymptotic Expression

5.4 2 Parameter Scans for Minimal Instability Growth Rate

5.5 Elimination of the Numerical Cerenkov Instability for Spectral EM-PIC codes

5.5.1 The NCI Modes For the Spectral Solver

5.5.2 The Positions and the Growth Rates of the NCI Modes for the Spectral Solver

5.53 LWFA Simulation in the Lorentz Boosted Frame with Spectral Solver

5.6 Conclusions

Chapter 6 Summary

6.1 Concluding Remarks

6.2 Future Work

Reference

Acknowledgement

Appendix A

A.1 Derivation of the Emittance Evolution in the Acceleration Stage

A.2 Interpolation Tensor and Finite Difference Operator

Notă biografică

Xinlu Xu received his B.Sc. in engineering physics from Tsinghua University, China in 2008. He obtained his Ph.D. in nuclear science and technology from Department of Engineering Physics, Tsinghua University in Jan. 2015. His major research project in Prof. Wei Lu’s group is phase space dynamics in plasma based wakefield acceleration. Subsequently, he became a post-doc fellow working with Prof. Warren B. Mori at Physics and Astronomy Department, University of California, Los Angeles, focusing on the generation, transportation of high quality electrons from plasma based wakefield accelerators and the development of high-fidelity particle-in-cell codes. Now he is working at SLAC National Accelerator Laboratory as a staff scientist to pursing high quality high energy acceleration in plasmas and study various interactions between intense beam, laser and plasmas.

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Caracteristici

Nominated as an outstanding PhD thesis by Tsinghua University Presents an original theory on the complex phase space dynamics of ionization injection in plasma wakefield acceleration, successfully identifying two key phase mixing processes responsible for the phase space evolution Proposes a novel two-color laser wakefield accelerator scheme for generating high-quality electron beams with very low emittance and low slice energy spread Features a preliminary design study on X-ray free-electron lasers driven by plasma accelerators

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