Optimization of sub-relativistic co-propagating accelerating structures

Area of Science:

• Physics
• Engineering
• Particle Acceleration

Background:

• Dielectric laser acceleration (DLA) offers a promising avenue for compact particle accelerators.
• Sub-relativistic particle acceleration requires precise control over particle-wave synchronicity.
• Continuous wave (CW) operation in slot waveguides presents unique design challenges for particle acceleration.

Purpose of the Study:

• To present novel optimization methodologies for sub-relativistic guided interaction structures in DLA.
• To design optimal tapered slot waveguides for maximizing particle energy gain.
• To validate physics-based design approaches with numerical methods.

Main Methods:

• Focus on co-propagating slot waveguide geometries in CW operation.
• Employ a physics-based approach to design optimal waveguide tapers for particle-wave synchronicity.
• Utilize a downhill simplex method searching algorithm for validation.
• Investigate a simplified 2D model for fast structure optimization.

Main Results:

• Demonstrated effective tapering of slot waveguides to achieve extended acceleration regions.
• Achieved significant energy gain through optimized particle-wave synchronicity.
• Validated physics-based optimization against numerical search algorithms.
• Showcased the utility of a 2D model for rapid design exploration.

Conclusions:

• The presented optimization methodologies enable enhanced performance in DLA structures.
• Tapered slot waveguides are crucial for maximizing energy gain in sub-relativistic DLA.
• Simplified 2D models offer a valuable tool for efficient design and exploration of accelerating structures.