2D hydrodynamic simulations of a variable length gas target for density down-ramp injection of electrons into a laser wakefield accelerator

Kononenko, Olena; Lopes, Nelson; Cole, J. M.; Kamperidis, C.; Mangles, S. P. D.; Najmudin, Z.; Osterhoff, Jens; Põder, Kristjan; Rusby, Dean; Symes, D. R.; Warwick, J.; Wood, Jonathan; Palmer, C. A. J.

doi:10.1016/j.nima.2016.03.104

Cited by 15 publications

(16 citation statements)

References 8 publications

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“…Finally, electrons are accelerated in a 2-mm-long plateau. Similar profiles have been obtained in hydrodynamics simulations of gas cells [55], proving that this kind of density profile is realistic. Variations in the gas cell give a great controllability of the beam parameters.…”

Section: A Decoupling Injection and Acceleration Processessupporting

confidence: 80%

Toward a plasma-based accelerator at high beam energy with high beam charge and high beam quality

Nghiem¹,

Aßmann²,

Beck³

et al. 2020

Phys. Rev. Accel. Beams

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From plasma-wakefield acceleration as a physics experiment toward a plasma-based accelerator as a user facility, the beam physics issues remaining to be solved are still numerous. Providing beams with high energy, charge, and quality simultaneously, not only within the plasma but also at the user doorstep itself, is the main concern. Despite its tremendous efficiency in particle acceleration, the wakefield displays a complex 3D profile which, associated to the beam-loading field induced by the accelerated beam itself, makes the acceleration of high charge to high energy often incompatible with high beam quality. Beam extraction from the plasma without quality degradation for a transfer either to the next plasma stage or to the user application is another difficulty to consider. This article presents the substantial studies carried out and the different innovative methods employed for tackling all these different issues. Efforts focused on achieving the challenging beam parameters targeted by the EuPRAXIA accelerator facility project. The lessons learned at the end of these in-depth simulations and optimizations are highlighted. The sensitivity to different error sources is also estimated to point out the critical components of such an accelerator. Finally, the needs in terms of laser and plasma parameters are provided.

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Section: A Decoupling Injection and Acceleration Processessupporting

confidence: 80%

Toward a plasma-based accelerator at high beam energy with high beam charge and high beam quality

Nghiem¹,

Aßmann²,

Beck³

et al. 2020

Phys. Rev. Accel. Beams

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“…2005) or in specially designed gas targets (Kononenko et al. 2016). The electron injection in the descending plasma density target has been studied in detail in experiments which are presented in Geddes et al.…”

Section: Introductionmentioning

confidence: 99%

“…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). The electron injection in the descending plasma density target has been studied in detail in experiments which are presented in Geddes et al (2008).…”

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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“…In the following we will make use of Gaussian DDRs, as they represent more realistically than linear ramps the kind of density transitions experimentally achievable [23]:…”

Section: Gaussian Rampsmentioning

confidence: 99%

Optimizing density down-ramp injection for beam-driven plasma wakefield accelerators

Ossa

Streeter

et al. 2017

Phys. Rev. Accel. Beams

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Density down-ramp (DDR) injection is a promising concept in beam-driven plasma wakefield accelerators for the generation of high-quality witness beams. We review and complement the theoretical principles of the method and employ particle-in-cell (PIC) simulations in order to determine constrains on the geometry of the density ramp and the current of the drive beam, regarding the applicability of DDR injection. Furthermore, PIC simulations are utilized to find optimized conditions for the production of high-quality beams. We find and explain the intriguing result that the injection of an increased charge by means of a steepened ramp favors the generation of beams with lower emittance. Exploiting this fact enables the production of beams with high charge (∼140 pC), low normalized emittance (∼200 nm) and low uncorrelated energy spread (0.3%) in sufficiently steep ramps even for drive beams with moderate peak current (∼2.5 kA).

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2D hydrodynamic simulations of a variable length gas target for density down-ramp injection of electrons into a laser wakefield accelerator

Cited by 15 publications

References 8 publications

Toward a plasma-based accelerator at high beam energy with high beam charge and high beam quality

Toward a plasma-based accelerator at high beam energy with high beam charge and high beam quality

On some theoretical problems of laser wake-field accelerators

Optimizing density down-ramp injection for beam-driven plasma wakefield accelerators

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