Mechanisms of electron injection into laser wakefields by a weak counter-propagating pulse

Sheng, Zheng-Ming; Wang, Weimin; Trines, R. M. G. M.; Norreys, P. A.; Chen, Min; Zhang, J.

doi:10.1140/epjst/e2009-01116-5

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…Thus, some of them are captured. The processes resulting in that injection can be categorized as crossing beatwave injection 33 , injection by laser field pre-acceleration 33 , injection by the longitudinal momentum kick 34,35 or stochastic heating 36 in the standing wave, injection by a ponderomotive drift 37 , wake-wake interference 26 , and interaction of the injection pulse with the wake behind the driver. Also, even though most of the trapped electrons originate from the interaction region, a small fraction of them are shifted to the wake behind the drive pulse by the injection pulse or by its wake.…”

Section: Simulationsmentioning

confidence: 99%

Generation of ultrafast electron bunch trains via trapping into multiple periods of plasma wakefields

et al. 2020

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We demonstrate a novel approach to the generation of femtosecond electron bunch trains via laserdriven wakefield acceleration. We use two independent high-intensity laser pulses, a drive, and injector, each creating their own plasma wakes. The interaction of the laser pulses and their wakes results in a periodic injection of free electrons in the drive plasma wake via several mechanisms, including ponderomotive drift, wake-wake interference, and pre-acceleration of electrons directly by strong laser fields. Electron trains were generated with up to 4 quasi-monoenergetic bunches, each separated in time by a plasma period. The time profile of the generated trains is deduced from an analysis of beam loading and confirmed using 2D Particle-in-Cell simulations.

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Section: Simulationsmentioning

confidence: 99%

Generation of ultrafast electron bunch trains via trapping into multiple periods of plasma wakefields

et al. 2020

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“…1(a) and 1(b). This leads to additional injection, which is called as the stochastic injection [37]. It is obvious that this stochastic acceleration of electrons can also result in injection of electrons into the laser wakefields.…”

Section: Mechanism Of Electron Injection Into Laser Wakefieldsmentioning

confidence: 99%

Theoretical Studies on Intense Laser Produced Quasi-Monoenergetic Particle Beams

Sheng¹,

Wang²,

Yan³

et al. 2009

AIP Conference Proceedings

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A brief review is presented on our recent theoretical studies on the quasimonoenergetic electron and proton beam generation by intense laser pulses. For the electron beam generation from laser wakefields, the mechanisms of electron injection by a laser pulse in the colliding geometry are investigated. It shows that there exist two mechanisms, which are called collective injection and stochastic injection. The number of injection electrons is studied as a function of the injection pulse intensity, pulse duration, as well as laser polarization. The injection by a transverse intersecting laser pulse is also investigated, which appears relatively easy for experimental setup. The required laser parameters are comparable to the colliding geometry. The proton acceleration by collisionless electrostatic shock waves is investigated and shock wave propagation through the interface of two targets with different ion species is simulated. It is found that ions with a relatively large charge-to-mass ratio can be accelerated successively in two counter-propagating shocks when they are overtaken by shock fronts until their energy is larger than the scalar potential of the shock waves. A scheme of ion acceleration in the new parameter regime called phase stable acceleration is proposed with the use of circularly-polarized laser pulses irradiating on very thin solid targets, which would enable one to obtain quasi-monoenergetic proton beams of multi-100MeV with 100TW-class lasers.

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“…The use of fully selfconsistent particle-in-cell (PIC) codes is sometimes necessary to completely encompass the full physical phenomena [24], and allow us to understand the internal dynamics of the interaction [25], in order to better explain experimental results [26,27] and better design the injection process [19,28]. In previous simulations, mainly dependence of laser pulse intensities, laser pulse polarizations [29], and location of the collision along the drive laser propagation axis on the electron beam properties were studied.…”

Section: Introductionmentioning

confidence: 99%

Design principles for high quality electron beams via colliding pulses in laser plasma accelerators

Cormier‐Michel

Ranjbar

Bruhwiler

et al. 2014

Phys. Rev. ST Accel. Beams

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Laser plasma based accelerators have the potential to reduce dramatically the size and cost of future particle colliders and light sources. Production of high quality beams along with reproducibility, tunability, and efficiency are required for many applications. We present design principles for two-pulse colliding laser pulse injection mechanisms, which can meet these requirements. Simulations are used to determine the best conditions for the production of high quality beams: high charge, low energy spread, and low emittance. Simulations also allow access to the internal dynamics of the interaction, providing insight regarding further improvement of the beam quality. We find that a 20 pC beam can be accelerated to 300 MeV in 4 mm with only a few percent energy spread and transverse normalized emittance close to 1 mm mrad, using a 10 TW laser. We demonstrate that this design scales according to linear theory. Control of the laser pulse mode content and subsequent evolution in the plasma channel are shown to be critical for achieving the highest beam quality.

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Mechanisms of electron injection into laser wakefields by a weak counter-propagating pulse

Cited by 7 publications

References 31 publications

Generation of ultrafast electron bunch trains via trapping into multiple periods of plasma wakefields

Generation of ultrafast electron bunch trains via trapping into multiple periods of plasma wakefields

Theoretical Studies on Intense Laser Produced Quasi-Monoenergetic Particle Beams

Design principles for high quality electron beams via colliding pulses in laser plasma accelerators

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