Computer simulations of a single-laser double-gas-jet wakefield accelerator concept

Hemker, R. G.; Hafz, N.; Uesaka, Mitsuru

doi:10.1103/physrevstab.5.041301

Cited by 37 publications

(27 citation statements)

References 18 publications

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“…[4][5][6] Even if the driver evolution is negligible (as in the case of beam-driven bubble 1,5 ), the bubble necessarily expands upon crossing a density down-ramp, and electrons may be self-injected. 45 If the down-ramp length is longer than a slippage distance, L ramp ) cT slip , then the bubble evolution is slow, and Eq. (2) …”

Section: Scenarios Of Self-injection In the Blowout Regimementioning

confidence: 99%

Electron self-injection into an evolving plasma bubble: Quasi-monoenergetic laser-plasma acceleration in the blowout regime

et al. 2011

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Electron self-injection into an evolving plasma bubble: Quasi-monoenergetic laser-plasma acceleration in the blowout regime" (2011 An electron density bubble driven in a rarefied uniform plasma by a slowly evolving laser pulse goes through periods of adiabatically slow expansions and contractions. Bubble expansion causes robust self-injection of initially quiescent plasma electrons, whereas stabilization and contraction terminate self-injection thus limiting injected charge; concomitant phase space rotation reduces the bunch energy spread. In regimes relevant to experiments with hundred terawatt-to petawatt-class lasers, bubble dynamics and, hence, the self-injection process are governed primarily by the driver evolution. Collective transverse fields of the trapped electron bunch reduce the accelerating gradient and slow down phase space rotation. Bubble expansion followed by stabilization and contraction suppresses the low-energy background and creates a collimated quasi-monoenergetic electron bunch long before dephasing. Nonlinear evolution of the laser pulse (spot size oscillations, self-compression, and front steepening) can also cause continuous self-injection, resulting in a large dark current, degrading the electron beam quality.

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Section: Scenarios Of Self-injection In the Blowout Regimementioning

confidence: 99%

Electron self-injection into an evolving plasma bubble: Quasi-monoenergetic laser-plasma acceleration in the blowout regime

et al. 2011

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“…In such gradients k p increases with propagation, causing the wake fronts behind the laser to fall further behind as the laser propagates which decreases the wake phase front velocity v$ [12,[16][17][18]. Use of the gradient separates density (which controls resonance of the plasma wave with laser pulse length [1]) from wake phase velocity, and controls wake phase velocity as a function of propagation distance.…”

Section: Experiments On Down-ramp Injectionmentioning

confidence: 99%

“…This is important for many applications, which desire momentum spreads below those of present experiments (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) MeV/c or few % longitudinal spread and ~0.2-2 MeV/c transverse spread). The short plasma wave wavelength X p = ^jtc 2 m/e 2 n e , typically ~ 10-100 um, determines the size requirement for the injected bunch, where n e is the plasma density.…”

Section: Introductionmentioning

confidence: 99%

Progress on laser plasma accelerator development using transversely and longitudinally shaped plasmas

Leemans

Esarey

Geddes

et al. 2009

Comptes Rendus. Physique

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A summary of progress at Lawrence Berkeley National Laboratory is given on: (1) experiments on down-ramp injection; (2) experiments on acceleration in capillary discharge plasma channels; and (3) simulations of a staged laser wakefield accelerator (LWFA). Control of trapping in a LWFA using plasma density down-ramps produced electron bunches with absolute longitudinal and transverse momentum spreads more than ten times lower than in previous experiments (0.17 and 0.02 MeV/c FWHM, respectively) and with central momenta of 0.76 ± 0.02 MeV/c, stable over a week of operation. Experiments were also carried out using a 40 TW laser interacting with a hydrogen-filled capillary discharge waveguide. For a 15 mm long, 200 urn diameter capillary, quasi-monoenergetic bunches up to 300 MeV were observed. By detuning discharge delay from optimum guiding performance, self-trapping was found to be stabilized. For a 33 mm long, 300 pm capillary, a parameter regime with high energy bunches, up to 1 GeV, was found. In this regime, peak electron energy was correlated with the amount of trapped charge. Simulations show that bunches produced on a down-ramn and injected into a channel-guided LWFA can produce stable beams with 0.2 MeV/c-class momentum spread at high energies. ResumeProgres dans le developpement d'accelerateurs laser-plasma utilisant des plasmas profiles transversalement et longitudinalement. On presente un resume des progres obtenus au Lawrence Berkeley National Laboratory sur : (1) les experiences sur l'injection dans une rampe de densite decroissante; (2) les experiences sur 1'acceleration dans des canaux de plasmas de decharges capillaires; et (3) les simulations d'accelerateur par champ de sillage laser (LWFA) en configuration multi-etages. Le controle du piegeage dans un LWFA a l'aide de rampes de densite decroissante produit des paquets d'electrons avec des dispersions de moment cinetique longitudinal et transversal plus de dix fois plus faibles que dans des experiences anterieures (respectivement 0,17 and 0,02 MeV/c FWHM) avec une valeur centrale de 0,76 ± 0,02 MeV/c, stable sur la duree de la semaine d'experience. Des experiences ont egalement ete faites a l'aide d'un laser de 40 TW interagissant avec un guide d'onde constitue par une decharge

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“…However, in most applications of laser-plasma produced electron bunches (e.g., in the electron injection in a particle accelerator [6] or in the tunable x-ray sources based on the Thomson scattering of an intense laser beam impinging on energetic electron bunches [7,8]), a reduced energy spread and a low transverse emittance of the beam are required. For this reason several teams are presently investigating, with theoretical and experimental approaches, different possibilities of reducing energy spread and beam emittance [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Production of high-quality electron beams in numerical experiments of laser wakefield acceleration with longitudinal wave breaking

Tomassini

Galimberti

Giulietti

et al. 2003

Phys. Rev. ST Accel. Beams

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In 1998 Bulanov et al. [Phys. Rev. E 58, R5257 (1998)] proposed a novel scheme for the production of high-quality electron beams in laser wakefield acceleration in which a controlled longitudinal nonlinear wave breaking is induced by a tailored electron density profile. This proposal was supported by both analytical and numerical results in a spatially one-dimensional configuration. In this paper we present results of a particle-in-cell simulation, two-dimensional in space and three-dimensional in the fields, of the interaction of an ultraintense laser pulse with a preformed plasma where the electron density decreases steeply from a first to a second plateau. We show that in our regime two-dimensional effects play a relevant role, allowing the production of well collimated, short and almost monochromatic electron beam. Remarkably low values of transverse and longitudinal normalized beam emittance tr rms 9 10 ÿ2 mm mrad and lon rms 2 mm keV are obtained.

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Computer simulations of a single-laser double-gas-jet wakefield accelerator concept

Cited by 37 publications

References 18 publications

Electron self-injection into an evolving plasma bubble: Quasi-monoenergetic laser-plasma acceleration in the blowout regime

Electron self-injection into an evolving plasma bubble: Quasi-monoenergetic laser-plasma acceleration in the blowout regime

Progress on laser plasma accelerator development using transversely and longitudinally shaped plasmas

Production of high-quality electron beams in numerical experiments of laser wakefield acceleration with longitudinal wave breaking

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