Propagation of short electron pulses in underdense plasmas

Barov, N.; Rosenzweig, James

doi:10.1103/physreve.49.4407

Cited by 60 publications

(42 citation statements)

References 14 publications

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“…3(b) has evolved into a "trumpet" shape that contains an expanding head region and a pinch region (with a reducing radius), which are typical for an electron bunch propagating in the ion-focusing-regime (IFR). 29 However, as shown in Fig. 3(b), the bunch head experiences a higher on-axis plasma electron density (prepared by the laser pulse) when it is injected with a greater delay τ d .…”

Section: A Effect Of the Electron Bunch Injection Delaymentioning

confidence: 99%

“…[24][25][26] When n b > n p0 of a underdense plasma condition, a large portion of background electrons is ejected by the bunch head, leaving an ion channel in a nonlinear plasma wave that can exerts a focusing force to the bunch correspondingly. [27][28][29] The goal of this work is to understand how the initial parameters of the injected bunch can be chosen to optimize the DLA. Selected time delays (with respect to the laser pulse), bunch lengths and bunch sizes are assigned to the injected electrons in a series of simulations.…”

Section: Introductionmentioning

confidence: 99%

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Particle-in-cell simulations of quasi-phase matched direct laser electron acceleration in density-modulated plasma waveguides

et al. 2014

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TaiwanQuasi-phase matched direct laser acceleration (DLA) of electrons can be realized with guided, radially polarized laser pulses in density-modulated plasma waveguides. A 3-D particle-in-cell model has been developed to describe the interactions among the laser field, injected electrons, and the background plasma in the DLA process. Simulations have been conducted to study the scheme in which seed electron bunches with moderate energies are injected into a plasma waveguide and the DLA is performed by use of relatively low-power (0.5-2 TW) laser pulses. Selected bunch injection delays with respect to the laser pulse, bunch lengths, and bunch transverse sizes have been studied in a series of simulations of DLA in a plasma waveguide. The results show that the injection delay is important for controlling the final transverse properties of short electron bunches, but it also affects the final energy gain. With a long injected bunch length, the enhanced ion-focusing force helps to collimate the electrons and a relatively small final emittance can be obtained. DLA efficiency is reduced when a bunch with a greater transverse size is injected; in addition, micro-bunching is clearly observed due to the focusing and defocusing of electrons by the radially directed Lorentz force. DLA should be performed with a moderate laser power to maintain favorable bunch transverse properties, while the waveguide length can be extended to obtain a higher maximum energy gain, with the commensurate increase of laser pulse duration and energy.

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Section: A Effect Of the Electron Bunch Injection Delaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Particle-in-cell simulations of quasi-phase matched direct laser electron acceleration in density-modulated plasma waveguides

et al. 2014

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“…can be written by substituting y for x. For an underdense plasma lens K = 2πr e n p /γ, where r e is the classical electron radius, and γ is the Lorentz factor [14]. Detailed predictions of the plasma lens focusing of the beam core can be made by solving Eq.…”

Section: Underdense Plasma Focusingmentioning

confidence: 99%

UCLA/FNPL Underdense Plasma Lens Experiment: Results and Analysis

Thompson¹,

Badakov²,

Rosenzweig³

et al. 2006

AIP Conference Proceedings

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Abstract. Focusing of a 15 MeV, 16 nC electron bunch by a gaussian underdense plasma lens operated just beyond the threshold of the underdense condition has been demonstrated. The strong 1.9 cm focal length plasma lens focused both transverse directions simultaneously and reduced the minimum area of the beam spot by a factor of 23. Analysis of the beam envelope evolution observed near the beam waist shows that the spherical aberrations of this underdense lens are lower than those of an overdense plasma lens, as predicted by theory. Time resolved measurements of the focused electron bunch are also reported and compared to simulations.

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“…Further, it has often been argued that one should choose the plasma density such that k p z 1 to optimize drive beam energy loss and accelerating beam energy gain in a PWFA [1,[3][4][5][9][10][11]. In order to explore the deviation in plasma response from the analytical (k p z !…”

Section: Ideal Scaling With a Gaussian Beam-plasma Systemmentioning

confidence: 99%

“…In order to accomplish ideal scaling [19], it is implied that the beam's matched beta function eq scales as k ÿ1 p , which is in fact the case [3,4], as eq 2 p k ÿ1 p . On the other hand, it is clear that the beam emittance " does not decrease during compression; it can be at best constant, and may indeed increase due to collective effects [20,21] such as coherent synchrotron radiation.…”

Section: Experimental Scaling With a Gaussian Beam-plasma Systemmentioning

confidence: 99%

Energy loss of a high charge bunched electron beam in plasma: Simulations, scaling, and accelerating wakefields

Rosenzweig

Barov

Thompson

et al. 2004

Phys. Rev. ST Accel. Beams

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The energy loss and gain of a beam in the nonlinear, ''blowout'' regime of the plasma wakefield accelerator, which features ultrahigh accelerating fields, linear transverse focusing forces, and nonlinear plasma motion, has been asserted, through previous observations in simulations, to scale linearly with beam charge. Additionally, from a recent analysis by Barov et al., it has been concluded that for an infinitesimally short beam, the energy loss is indeed predicted to scale linearly with beam charge for arbitrarily large beam charge. This scaling is predicted to hold despite the onset of a relativistic, nonlinear response by the plasma, when the number of beam particles occupying a cubic plasma skin depth exceeds that of plasma electrons within the same volume. This paper is intended to explore the deviations from linear energy loss using 2D particle-in-cell simulations that arise in the case of experimentally relevant finite length beams. The peak accelerating field in the plasma wave excited behind the finite-length beam is also examined, with the artifact of wave spiking adding to the apparent persistence of linear scaling of the peak field amplitude into the nonlinear regime. At large enough normalized charge, the linear scaling of both decelerating and accelerating fields collapses, with serious consequences for plasma wave excitation efficiency. Using the results of parametric particle-in-cell studies, the implications of these results for observing severe deviations from linear scaling in present and planned experiments are discussed.

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Propagation of short electron pulses in underdense plasmas

Cited by 60 publications

References 14 publications

Particle-in-cell simulations of quasi-phase matched direct laser electron acceleration in density-modulated plasma waveguides

Particle-in-cell simulations of quasi-phase matched direct laser electron acceleration in density-modulated plasma waveguides

UCLA/FNPL Underdense Plasma Lens Experiment: Results and Analysis

Energy loss of a high charge bunched electron beam in plasma: Simulations, scaling, and accelerating wakefields

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