Ultra-low emittance beam generation using two-color ionization injection in a CO2 laser-driven plasma accelerator

Schroeder, Carl; Benedetti, C.; Bulanov, S. S.; Chen, M.; Esarey, E.; Geddes, C. G. R.; Vay, J. -L.; Yu, L. -L.; Leemans, W. P.

doi:10.48550/arxiv.1505.05846

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“…Therefore it can be triggered by the laser pulse exciting the wakefield [20,26,27], by the wakefield itself [28], by transversely colliding laser pulses [29,30], or by a second, trailing, laser pulse. In the latter case, wakefield excitation and ionization are independent processes, which allows a precise manipulation of the phase space distribution of trapped electrons and thus a generation of ultra-low emittance electron beams [31][32][33][34][35][36][37]40]. If the driving laser pulse is replaced by a short electron beam, the Trojan horse regime (THWFA) of underdense photocathode plasma wakefield acceleration (PWFA) is reached [38,39].…”

Section: Introductionmentioning

confidence: 99%

Fixing E-field divergence in strongly nonlinear wakefields in homogeneous plasma

Reichwein,

Thomas,

Golovanov

et al. 2020

Preprint

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Available analytical wakefield models for the bubble and the blow-out regime of electron-plasma acceleration perfectly describe important features like shape, fields, trapping ratio, achievable energy, energy distribution and radial emittance. As we show, for wakefields with an extremely small amplitude these models fail to describe the accelerating electric field and its divergence in the wakefield rear. Since prominent parameter regimes like the Trojan horse regime of photocathode injection exhibit this feature, it is of great importance to work out analytical models that fix this problem; one possible model is introduced in this work. Using a phenomenological theory, we are able to better describe the divergence of the electric field and the bubble shape.

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