University thesis:
Dissertation, Tsinghua University, 2019
Footnote:
Doctoral Thesis accepted by Tsinghua University, Beijing, China
Description:
Introduction -- Phase Space Dynamics of Injected Electron Beams in Ionization Injection -- Coherent Phase Space Matching Using Longitudinally Tailored Plasma Structure -- X-FELs Driven by Plasma Based Accelerators -- Numerical Instability due to Relativistic Plasma Drift in EM-PIC Simulations -- Summary.
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.