Step-like concave retroreflector for single pulse Compton backscattering

Area of Science:

• Plasma Physics
• Accelerator Physics
• Optics

Background:

• Laser wakefield accelerators (LWFAs) are powerful tools for generating high-energy particle beams and radiation.
• Inverse Compton scattering (ICS) is a key process for producing tunable, high-brightness photon sources.
• Enhancing ICS efficiency and radiation quality is crucial for advancing applications in various scientific fields.

Purpose of the Study:

• To introduce and evaluate a novel step-like retroreflector (SR) for enhancing all-optical ICS in LWFAs.
• To compare the performance of the SR with traditional reflectors in ICS processes.
• To provide a theoretical framework for optimizing SR design and LWFA parameters for maximum scattering efficiency.

Main Methods:

• Three-dimensional particle-in-cell (PIC) simulations were employed to model the interaction of laser pulses with plasma and the SR.
• Theoretical analysis was conducted to derive conditions for matched collisions and optimize SR geometry.
• Performance metrics including scattering efficiency and radiation source characteristics were analyzed.

Main Results:

• The SR significantly enhances ICS efficiency compared to standard flat retroreflectors.
• The SR design expands the longitudinal extent of the laser pulse, improving scattering outcomes.
• Simulations demonstrate the stability and robustness of the SR-enhanced ICS process.

Conclusions:

• The step-like retroreflector presents a promising advancement for all-optical ICS in LWFAs.
• This technology can lead to improved radiation source quality and efficiency.
• The findings pave the way for developing more reliable and advanced radiation sources.