THz-driven electron manipulation via non-velocity-matched interaction in dielectric-loaded waveguides

Area of Science:

• Physics
• Engineering
• Materials Science

Background:

• Dielectric-loaded waveguides (DLWs) enable compact ultrafast electron beam control using terahertz (THz) waves.
• Fabrication tolerances in DLWs can lead to dephasing, hindering precise electron beam manipulation.

Purpose of the Study:

• Investigate THz-driven electron beam dynamics in non-velocity-matched DLW interactions.
• Determine the relationship between velocity mismatch and required THz energy for electron manipulation.
• Propose a novel method for cascaded electron compression and focusing within a single DLW.

Main Methods:

• Simulated electron beam dynamics in DLWs under non-velocity-matched conditions.
• Analyzed the influence of velocity mismatch on electron-THz wave interaction.
• Developed a strategy for cascaded focusing by phase-matching electrons to different THz wave components.

Main Results:

• Quantified the impact of velocity mismatch on THz energy requirements for electron control.
• Demonstrated that non-velocity-matched interactions can still achieve significant electron manipulation.
• Proposed a cascaded focusing technique adaptable to single DLW structures.

Conclusions:

• Understanding velocity mismatch is crucial for optimizing THz-driven electron beam control in DLWs.
• The proposed cascaded focusing method offers a flexible approach to generating high-quality ultrafast electron sources.
• This research broadens the applicability of THz-driven devices for advanced electron beam applications.