Acceleration of Electrons by the Interaction of a Bunched Electron Beam with a Plasma

Chen, Pisin; Dawson, J. M.; Huff, Robert W.; Katsouleas, T.

doi:10.1103/physrevlett.54.693

Cited by 791 publications

(458 citation statements)

References 5 publications

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“…One such scheme is a particle beam-driven accelerator known as a plasma wakefield accelerator (PWFA) [1]. In a proof-of-principle PWFA experiment [2], the energy of incoming 42 GeV electrons was doubled over a plasma length of % 85 cm, corresponding to a gradient of nearly 50 GeV=m.…”

Section: Introductionmentioning

confidence: 99%

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Hollow plasma channel for positron plasma wakefield acceleration

Kimura

Milchberg

Muggli

et al. 2011

Phys. Rev. ST Accel. Beams

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Plasma wakefield acceleration (PWFA) has demonstrated the ability to produce very high gradients to accelerate electrons and positrons. In PWFA, a drive bunch of charged particles passes through a uniform plasma, thereby generating a wakefield that accelerates a witness bunch traveling behind the drive bunch. This process works well for electrons, but much less so for positrons due to the positive charge attracting rather than repealing the plasma electrons, which leads to reduced acceleration gradient, halo formation, and emittance growth. This problem can be alleviated by having the positron beam travel through a hollow plasma channel. Presented are modeling results for producing 10-100 cm long hollow plasma channels suitable for positron PWFA. These channels are created utilizing laser-induced gas breakdown in hydrogen gas. The results show that hollow channels with plasma densities of order 10 16 cm À3 and inner channel radii of order 20 m are possible using currently available terawatt-level lasers. At these densities and radii, preliminary positron PWFA modeling indicates that longitudinal electric fields on axis can exceed 3 GV=m.

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Section: Introductionmentioning

confidence: 99%

“…Nonetheless, a high n e is desirable because multi-GeV=m energy gains are then possible [1,11]. Positron bunch lengths <100 m are feasible [11]; hence, a channel wall density of 6 Â 10 16 cm À3 , corresponding to p slightly longer than 100 m, was selected as the target value for our modeling effort.…”

Section: Introductionmentioning

confidence: 99%

Hollow plasma channel for positron plasma wakefield acceleration

Kimura

Milchberg

Muggli

et al. 2011

Phys. Rev. ST Accel. Beams

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“…The case where the beam propagates through a cold plasma, with plasma density large compared with the beam density, can be studied by use of linear perturbation theorỹ Chen et al, 1985!. Here, we focus on the nonlinear case where the plasma density has an arbitrary value compared with the beam density, and, correspondingly, the degrees of current and charge neutralization are arbitrary.…”

Section: Introductionmentioning

confidence: 99%

Analytical and numerical studies of heavy ion beam transport in the fusion chamber

2002

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The propagation of a high-current finite-length ion charge bunch through a background plasma is of interest for many applications, including heavy ion fusion, plasma lenses, cosmic ray propagation, and so forth. Charge neutralization has been studied both analytically and numerically during ion beam entry, propagation, and exit from the plasma. A suite of codes has been developed for calculating the degree of charge and current neutralization of the ion beam pulse by the background plasma. The code suite consists of two different codes: a fully electromagnetic, relativistic particle-in-cell code, and a relativistic Darwin model for long beams. As a result of a number of simplifications, the second code is hundreds of times faster than the first one and can be used for most cases of practical interest, while the first code provides important benchmarking for the second. An analytical theory has been developed using the assumption of long charge bunches and conservation of generalized vorticity. The model predicts nearly complete charge neutralization during quasi-steady-state propagation provided the beam pulse duration t b is much longer than the inverse electron plasma frequency v p Ϫ1 , where v p ϭ~4pn p e 2 0m e ! 102 and n p is the background plasma density. In the opposite limit, the beam head excites large-amplitude plasma waves. Similarly, the beam current is well neutralized provided v p t b . . 1 and the beam radius is much larger than plasma skin depth d p ϭ c0v p . Equivalently, the condition for current neutralization can be expressed in terms of the beam current as

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“…Producing and accelerating high-quality electron bunches within very compact footprints is a challenging task that will most probably use advanced acceleration methods. These techniques can be categorized into laser-driven [1][2][3] and charged-particle-beam-driven methods [4][5][6][7]. In the latter scheme, a popular configuration consists of a "drive" electron bunch with suitable parameters propagating through a high-impedance structure or plasma medium thereby inducing an electromagnetic wake.…”

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confidence: 99%

Generation and Characterization of Electron Bunches with Ramped Current Profiles in a Dual-Frequency Superconducting Linear Accelerator

et al. 2012

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We report on the successful experimental generation of electron bunches with ramped current profiles. The technique relies on impressing nonlinear correlations in the longitudinal phase space using a superconducing radiofrequency linear accelerator operating at two frequencies and a currentenhancing dispersive section. The produced ∼ 700-MeV bunches have peak currents of the order of a kilo-Ampère. Data taken for various accelerator settings demonstrate the versatility of the method and in particular its ability to produce current profiles that have a quasi-linear dependency on the longitudinal (temporal) coordinate. The measured bunch parameters are shown, via numerical simulations, to produce gigavolt-per-meter peak accelerating electric fields with transformer ratios larger than 2 in dielectric-lined waveguides.

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Acceleration of Electrons by the Interaction of a Bunched Electron Beam with a Plasma

Cited by 791 publications

References 5 publications

Hollow plasma channel for positron plasma wakefield acceleration

Hollow plasma channel for positron plasma wakefield acceleration

Analytical and numerical studies of heavy ion beam transport in the fusion chamber

Generation and Characterization of Electron Bunches with Ramped Current Profiles in a Dual-Frequency Superconducting Linear Accelerator

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