• Matter and Radiation at Extremes
  • Vol. 7, Issue 5, 054001 (2022)
Jia Wang1、2、*, Ming Zeng1、2, Dazhang Li1、2, Xiaoning Wang1、2, Wei Lu3, and Jie Gao1、2
Author Affiliations
  • 1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Department of Engineering Physics, Tsinghua University, Beijing 100084, China
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    DOI: 10.1063/5.0101098 Cite this Article
    Jia Wang, Ming Zeng, Dazhang Li, Xiaoning Wang, Wei Lu, Jie Gao. Injection induced by coaxial laser interference in laser wakefield accelerators[J]. Matter and Radiation at Extremes, 2022, 7(5): 054001 Copy Citation Text show less

    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.
    E(r,z,t)=E0w0w(z)T(zct)expr2w2(z)+iϕ,

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    ϕ=kr22R(z)+zctz0+ϕCEP+ϕG

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    R(z)=zzf+zR2zzf

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    ϕG=arctanzzfzR

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    Δϕaϕ1r=0ϕ0r=0=Δϕ+ΔϕG,

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    Δϕ=ϕ1ϕ0=kr221R01R1+Δϕakr221R1+Δϕa,

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    rc=2R1k[(2m+1)π+Δϕa].

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    rc*rcm=0=2R1k(π+Δϕa).

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    Lb/2<Lc<Lb,

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    rc*3π+2Δϕkzzf1,

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    Jia Wang, Ming Zeng, Dazhang Li, Xiaoning Wang, Wei Lu, Jie Gao. Injection induced by coaxial laser interference in laser wakefield accelerators[J]. Matter and Radiation at Extremes, 2022, 7(5): 054001
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