Direct Acceleration of Electrons in a Corrugated Plasma Waveguide

York, Andrew G.; Milchberg, H. M.; Palastro, J. P.; Antonsen, Thomas M.

doi:10.1103/physrevlett.100.195001

Cited by 96 publications

(55 citation statements)

References 12 publications

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“…The first two we can rule out: the charge of the beams used in the simulations is 5 pC, less than space charge limit calculated previously, 40 pC per bunch [10]. Furthermore, the ponderomotive force on the beam scales as F pm / a 2 0 =, which because of the inverse proportionality to is quite small.…”

Section: D Pic Simulation Resultsmentioning

confidence: 99%

“…Four particles are loaded at each cell to represent electrons consisting a plasma waveguide. The parameters for the density profile are an average density n 0 ¼ 7 Â 10 18 cm À3 , a modulation amplitude of À ¼ 0:9, and a modulation period of 356 m. This choice of parameters sets the phase velocity of the 1st spatial harmonic to c based on the simple theory and are experimentally realizable [10]. Later we will show that electron energy gain is sensitive to the choice of modulation period.…”

Section: Code Detail and Verificationmentioning

confidence: 99%

“…In particular, simple analysis shows that the ideal phase velocity for a relativistic electron beam is v p;1 ¼ c, or k m ¼ Àk [10]. With the analytic expression for the vector potential in a corrugated waveguide, a scaling law for energy gain of an electron can be derived.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-phase-matched acceleration of electrons in a corrugated plasma channel

Yoon

Palastro

Gordon

et al. 2012

Phys. Rev. ST Accel. Beams

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A laser pulse propagating in a corrugated plasma channel is composed of spatial harmonics whose phase velocities can be subluminal. The phase velocity of a spatial harmonic can be matched to the speed of a relativistic electron resulting in direct acceleration by the guided laser field in a plasma waveguide and linear energy gain over the interaction length. Here we examine the fully self-consistent interaction of the laser pulse and electron beam using particle-in-cell (PIC) simulations. For low electron beam densities, we find that the ponderomotive force of the laser pulse pushes plasma channel electrons towards the propagation axis, which deflects the beam electrons. When the beam density is high, the space charge force of the beam drives the channel electrons off axis, providing collimation of the beam. In addition, we consider a ramped density profile for lowering the threshold energy for trapping in a subluminal spatial harmonic. By using a density ramp, the trapping energy for a normalized vector potential of a 0 ¼ 0:1 is reduced from a relativistic factor 0 ¼ 170 to 0 ¼ 20.

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Section: D Pic Simulation Resultsmentioning

confidence: 99%

Section: Code Detail and Verificationmentioning

confidence: 99%

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Quasi-phase-matched acceleration of electrons in a corrugated plasma channel

Yoon

Palastro

Gordon

et al. 2012

Phys. Rev. ST Accel. Beams

Self Cite

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“…There are methods for reducing the phase-slippage in the acceleration channel, such as the transverse modulation of the plasma density [21], the so called laser guiding technique.…”

Section: Requirements On the Electron Beam Energymentioning

confidence: 99%

Conceptual and Technical Design Aspects of Accelerators for External Injection in LWFA

et al. 2018

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Laser driven Wake-Field Acceleration (LWFA) has proven its capability of accelerating electron bunches (e-bunches) to up to 4 GeV energy in a single stage while reaching gradients up to hundreds of GV/m. Because of the short period of the accelerating field (typically ranging from 100 fs to 1 ps duration) and the requirement of extremely small beam size (typically smaller than 1 µm) to match the channel, e-bunches can reach extremely high densities. They can be either extracted directly from the plasma or externally injected. The study of the external injection is interesting for two main reasons. On the one hand this method allows better control of the quality of the input beam and on the other hand it is in general necessary when a staged approach of the accelerator is considered. The interest in producing, characterizing and transporting high brightness ultra-short e-bunches has grown together with the interest in LWFA and other novel high-gradient acceleration techniques. In this paper we will review the principal techniques for producing and shaping ultra-short electron bunches with the example of the SINBAD-ARES (Accelerator Research Experiment at SINBAD) linac at the Deutsches Elektronen-Synchrotron (DESY). Our goal is to show how the design of the SINBAD-ARES linac satisfies the requirements for generating high brightness LWFA probes. In the last part of the paper we shall also comment on the technical challenges for electron control and characterization.

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“…Propagation of high-order laser modes is also important for direct electron acceleration by the laser field in vacuum [6] and in plasma channels [7], and to improve injection schemes in LPAs [8]. Plasma channel applications rely on the propagation of the laser pulse at high intensity, up to 10 19 W=cm 2 for laser-plasma accelerators [9], over long distances.…”

Section: Introductionmentioning

confidence: 99%

Control of focusing fields in laser-plasma accelerators using higher-order modes

Cormier‐Michel

Esarey

Geddes

et al. 2011

Phys. Rev. ST Accel. Beams

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Higher-order laser modes are analyzed as a method to control focusing forces and improve the electron bunch quality in laser-plasma accelerators. In the linear wake regime, the focusing force is proportional to the transverse gradient of the laser intensity, which can be shaped by a superposition of modes. In particular, the transverse wakefield can be arbitrarily small in a region about the axis by adjusting the laser modes. Plasma channel effects, which prohibit the formation of the controlled-focusing region, can be mitigating by introducing a delay between the modes. Modes with parallel polarization produce a beat interference in the laser intensity, which lead to deflecting forces. This can be avoided by using modes with orthogonal polarization, different frequencies, or short pulses that do not overlap. Particle-in-cell simulations are performed of a laser-plasma accelerator in the quasilinear regime driven by high-order modes. Simulations show that, by including the first-order mode, the matched radius of the electron bunch is substantially increased, which for fixed bunch density and emittance implies an increase in the beam charge.

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Direct Acceleration of Electrons in a Corrugated Plasma Waveguide

Cited by 96 publications

References 12 publications

Quasi-phase-matched acceleration of electrons in a corrugated plasma channel

Quasi-phase-matched acceleration of electrons in a corrugated plasma channel

Conceptual and Technical Design Aspects of Accelerators for External Injection in LWFA

Control of focusing fields in laser-plasma accelerators using higher-order modes

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