Beam loading by electrons in nonlinear plasma wakes

Tzoufras, M.; Lü, Wei; Tsung, F. S.; Huang, Chengkun; Mori, W. B.; Katsouleas, T.; Vieira, Jorge; Fonseca, Ricardo; Silva, L. O.

doi:10.1063/1.3118628

Cited by 118 publications

(147 citation statements)

References 33 publications

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“…35 In this section, we verify the testparticle results by running a fully explicit 3D PIC simulation with the identical set of initial conditions. We use the quasicylindrical code CALDER-CIRC, 40 which preserves realistic geometry of interaction and accounts for the axial asymmetry by decomposing electromagnetic fields (laser and wake) into a set of poloidal modes (whereas the particles remain in full 3D).…”

Section: Validation Of Self-injection Scenarios In First-principmentioning

confidence: 99%

“…In this way, electron self-injection associated with bubble and driver evolution is separated from the effects brought about by the collective fields of the trapped electron bunch, i.e., from effects due to beam loading. 35 This simulation approach allows to fully characterize details of the self-injection process 18,26,27 and to relate the injection process to dynamics of the laser and the bubble using a nonstationary Hamiltonian formalism. 24,26 The WAKE simulation uses the grid dn ¼ 0:035k À1 p % 0:073 lm, dr % 0:1k À1 p with 30 macroparticles per radial cell, and time step dt ¼ dz=c…”

Section: Scenarios Of Self-injection In the Blowout Regimementioning

confidence: 99%

“…We find that, in spite of high injected charge, this scenario remains the same in both quasistatic and fully explicit electromagnetic threedimensional particle-in-cell (3D PIC) simulations. Beam loading 35 becomes important only in the final stage of this process. Importantly, transverse matching of the pulse for self-guiding precludes neither periodic nor continuous injection.…”

Section: Introductionmentioning

confidence: 99%

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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: Validation Of Self-injection Scenarios In First-principmentioning

confidence: 99%

Section: Scenarios Of Self-injection In the Blowout Regimementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2011

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“…The beam loading effect can place severe limitations on the maximum beam current that can be accelerated [23,24], nevertheless it can also be used to compensate the wake-field gradient through variation of the electron beam-laser longitudinal offset [25,26]. In order to profit from the beam loading effect to minimize the energy spread at the exit of the plasma chamber, it is desirable to have control over the longitudinal beam charge profile.…”

Section: Requirements On Bunch Charge and Its Stabilitymentioning

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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“…It maintains accelerating and focusing gradients up to several GV/cm, also conserving the normalized transverse emittance. Electron cavitation relaxes limitations on the charge imposed by beam loading [4]. The bubble readily traps relativistic electrons from its sheath [1,5,6,7], reducing the technical complexity of the experiment while preserving flexibility in parameters [2,5,7].…”

Section: Introductionmentioning

confidence: 99%

Sub-millimeter-scale, 100-MeV-class quasi-monoenergetic laser plasma accelerator based on all-optical control of dark current in the blowout regime

Kalmykov¹,

Davoine²,

Shadwick³

2013

AIP Conference Proceedings

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It is demonstrated that by negatively chirping the frequency of a 20-fs, 15-TW driving laser pulse with an ultrabroad bandwidth (corresponding to a sub-2-cycle transform-limited duration) it is possible to prevent early compression of the pulse into an optical shock, thus reducing expansion of the accelerating plasma bucket (electron density "bubble") and delaying dephasing of self-injected and accelerated electrons. These features help suppress unwanted continuous selfinjection (dark current) in the blowout regime, making possible to use the entire dephasing length to generate lowbackground, quasi-monoenergetic 200-MeV-scale electron beams from sub-mm-length dense plasmas (n e0 =1.3×10 19 cm −3 ).

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Beam loading by electrons in nonlinear plasma wakes

Cited by 118 publications

References 33 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

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

Sub-millimeter-scale, 100-MeV-class quasi-monoenergetic laser plasma accelerator based on all-optical control of dark current in the blowout regime

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