Phase space dynamics of a plasma wakefield dechirper for energy spread reduction

Abstract

Plasma-based accelerators have made impressive progress in recent years. However, the beam energy spread obtained in these accelerators is still at ~ 1 % level, nearly one order of magnitude larger than what is needed for challenging applications like coherent light sources or colliders. In plasma accelerators, the beam energy spread is mainly dominated by its energy chirp (longitudinally correlated energy spread). Here we demonstrate that when an initially chirped electron beam from a linac with a proper current profile is sent through a low-density plasma structure, the self wake of the beam can significantly reduce its energy chirp and the overall energy spread. The resolution-limited energy spectrum measurements show at least a threefold reduction of the beam energy spread from 1.28 % to 0.41 % FWHM with a dechirping strength of ~ 1 (MV/m)/(mm pC). Refined time-resolved phase space measurements, combined with high-fidelity three-dimensional particle-in-cell simulations, further indicate the real energy spread after the dechirper is only about 0.13 % (FWHM), a factor of 10 reduction of the initial energy spread.

References in corpus (6)

• Generation of High Brightness Electron Beams via Ionization Induced Injection by Transverse Colliding Lasers in a Beam-Driven Plasma Wakefield Accelerator
• A tunable plasma-based energy dechirper
• Experimental Demonstration of Energy Chirp Compensation by a Tunable Dielectric Based Structure
• Longitudinal phase-space manipulation with beam-driven plasma wakefields
• Generating 10~40MeV high quality monoenergetic electron beams using a 5TW 60fs laser at Tsinghua University
• Simulations of an energy dechirper based on dielectric lined waveguides

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• On the generation of ultra-bright and low energy spread electron beams in laser wakefield acceleration in a uniform plasma
• Intrinsic energy spread and bunch length growth in plasma-based accelerators due to betatron motion
• Scissor-cross ionization injection in laser wakefield accelerators
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• Charge coupling in multi-stage laser wakefield acceleration
• Simulation Study of Energy Chirp Induced Effects in Laser Wakefield Accelerator Driven Free Electron Laser