Injection induced by coaxial laser interference in laser wakefield accelerators

Author:

Wang Jia12ORCID,Zeng Ming12ORCID,Li Dazhang12ORCID,Wang Xiaoning12ORCID,Lu Wei3,Gao Jie12

Affiliation:

1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

2. University of Chinese Academy of Sciences, Beijing 100049, China

3. Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Abstract

We propose a new injection scheme that can generate electron beams with simultaneously a few permille energy spread, submillimeter milliradian emittance, and more than a 100 pC charge in laser wakefield accelerators. In this scheme, a relatively loosely focused laser pulse drives the plasma wakefield, and a tightly focused laser pulse with similar intensity triggers an interference ring pattern that creates onion-like multisheaths in the plasma wakefield. Owing to the change in wavefront curvature after the focal position of the tightly focused laser, the innermost sheath of the wakefield expands, which slows down the effective phase velocity of the wakefield and triggers injection of plasma electrons. Both quasicylindrical and fully three-dimensional particle-in-cell simulations confirm the generation of beams with the above mentioned properties.

Funder

Key Research Program of Frontier Science, Chinese Academy of Sciences

Institute of High Energy Physics

Publisher

AIP Publishing

Subject

Electrical and Electronic Engineering,Nuclear Energy and Engineering,Nuclear and High Energy Physics,Atomic and Molecular Physics, and Optics

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