High brightness, symmetric electron bunch generation in a plasma wakefield accelerator via a radially-polarized plasma photocathode

Abstract

The plasma photocathode has previously been proposed as a source of ultra-high-brightness electron bunches within plasma accelerators. Here, the scheme is extended by using a radially-polarized ionizing laser pulse to generate high-charge, high-brightness electron bunches with symmetric transverse emittance. Efficient start-to-end modelling of the scheme, from ionization and trapping until drive bunch depletion, enables a multi-objective Bayesian optimisation routine to be performed to understand the performance of the radially-polarized plasma photocathode, quantify the stability of the scheme, and explore the fundamental relation between the witness bunch charge and its emittance. Comparison of plasma photocathodes driven by radially- and linearly-polarized laser pulses show that the former yields higher brightness electron bunches when operating in the optimally-loaded regime.

14 pages, 10 figures

References in corpus (15)

• A spectral, quasi-cylindrical and dispersion-free Particle-In-Cell algorithm
• Beam loading in the nonlinear regime of plasma-based acceleration
• Demonstration of a compact plasma accelerator powered by laser-accelerated electron beams
• Two-Pulse Ionization Injection into Quasi-Linear Laser Wakefields
• Multi-Pulse Laser Wakefield Acceleration: A New Route to Efficient, High-Repetition-Rate Plasma Accelerators and High Flux Radiation Sources
• FLASHForward: Plasma-wakefield accelerator science for high-average-power applications
• A hybrid, asymmetric, linear Higgs factory based on plasma-wakefield and radio-frequency acceleration
• HiPACE++: a portable, 3D quasi-static Particle-in-Cell code
• Accurate modeling of plasma acceleration with arbitrary order pseudo-spectral particle-in-cell methods
• Stable and high quality electron beams from staged laser and plasma wakefield accelerators
• Interaction of ultraintense radially-polarized laser pulses with plasma mirrors
• Bayesian optimization of laser-plasma accelerators assisted by reduced physical models
• libEnsemble: A Library to Coordinate the Concurrent Evaluation of Dynamic Ensembles of Calculations
• Attosecond-Angstrom free-electron-laser towards the cold beam limit
• Resonant emittance mixing of flat beams in plasma accelerators