Controlled electron injection into the wake wave using plasma density inhomogeneity

Brantov, A. V.; Esirkepov, T. Zh.; Kando, M.; Kotaki, Hajime; Bychenkov, V. Yu.; Bulanov, Sergei V.

doi:10.1063/1.2956989

Cited by 100 publications

(104 citation statements)

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“…The dense plasma stage is used as an injector of the electrons which are further accelerated in a relatively low-density region. Such configurations may be considered as corresponding to the scheme of the density downramp injection due to the phase-mixing process of the plasma waves in an inhomogeneous plasma (Bulanov et al 1998;Suk et al 2001;Thompson, Rosenzweig & Suk 2004;Tomassini et al 2004;Brantov et al 2008;Zhang et al 2016). A transient density ramp can be produced by a laser prepulse (Zhidkov et al 2004b;Chien et al 2005) or in specially designed gas targets (Kononenko et al 2016).…”

Section: Introductionmentioning

confidence: 99%

On some theoretical problems of laser wake-field accelerators

et al. 2016

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Enhancement of the quality of laser wake-field accelerated (LWFA) electron beams implies the improvement and controllability of the properties of the wake waves generated by ultra-short pulse lasers in underdense plasmas. In this work we present a compendium of useful formulas giving relations between the laser and plasma target parameters allowing one to obtain basic dependences, e.g. the energy scaling of the electrons accelerated by the wake field excited in inhomogeneous media including multi-stage LWFA accelerators. Consideration of the effects of using the chirped laser pulse driver allows us to find the regimes where the chirp enhances the wake field amplitude. We present an analysis of the three-dimensional effects on the electron beam loading and on the unlimited LWFA acceleration in inhomogeneous plasmas. Using the conditions of electron trapping to the wake-field acceleration phase we analyse the multi-equal stage and multiuneven stage LWFA configurations. In the first configuration the energy of fast electrons is a linear function of the number of stages, and in the second case, the accelerated electron energy grows exponentially with the number of stages. The results of the two-dimensional particle-in-cell simulations presented here show the high quality electron acceleration in the triple stage injection-acceleration configuration.

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Section: Introductionmentioning

confidence: 99%

On some theoretical problems of laser wake-field accelerators

et al. 2016

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“…This effect relaxes the condition for longitudinal wave-breaking, i.e. reduces the velocity which plasma electrons have to achieve to be trapped, and hence, enables particle injection [17,24]. Simultaneously, in the presence of the longitudinal density gradient, plasma electrons experience a phase shift.…”

Section: Density Down-ramp Injectionmentioning

confidence: 99%

Beam-driven plasma-based acceleration of electrons with density down-ramp injection at FLASHForward

Grebenyuk

Ossa

Mehrling

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tWe present simulations of injection of plasma electrons triggered by a negative gradient in the plasmadensity profile for beam-driven plasma-wakefield acceleration. Studies show the potential of this trapping technique for the production of narrow-energy bandwidth, femtosecond, high-current electron beams with a small transverse normalised emittance in the hundred nm range. Moreover, the accelerated beams feature strong longitudinal phase-space correlations with sub-percent uncorrelated energy spreads. Tuning of density down-ramp injection is explored by scanning the slope and length of the downward transition. It is found that the mechanism causes particle trapping over a wide experimentally accessible parameter range. All simulations were performed in three spatial dimensions with the particle-in-cell code OSIRIS [1]. The investigated driver-beam properties and the plasma profile resemble expected experimental conditions at the FLASHForward facility at DESY.

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“…In order to control the beam energy we are considering injection due to a sharp density gradient [15,16,17]. Experimentally, this has been shown to obtain consistent beam energies [9,10].…”

Section: Staged Accelerationmentioning

confidence: 99%