Acceleration and radiation of externally injected electrons in laser plasma wakefield driven by a Laguerre–Gaussian pulse

Shen, Z.-C.; Chen, Min; Zhang, Guo-Bo; Luo, Jizhuang; Weng, Shangkun; Yuan, Xiaohui; Liu, Feng; Sheng, Zheng-Ming

doi:10.1088/1674-1056/26/11/115204

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…For the sake of simplicity, the first order LG mode (l = 1, n = 0) is considered in our model, which has been used by most papers to study electron acceleration and radiation sources. [23][24][25][26][27][28][29][30][31][32][33] By inserting Eq. ( 4) into Eq.…”

Section: Evolution Equation Of Laser Spot Sizementioning

confidence: 99%

“…In recent years, there has been an increasing interest on the laser pulses with Laguerre-Gaussian (LG) modes which have hollow transverse intensity profile and carry orbital angular momentum. [23][24][25][26][27][28][29][30][31][32][33] LG laser pulses drive donut-shaped wake fields whose field structure is capable of accelerating positrons and significantly enhances x/γ-ray generation. [23][24][25][26] Obviously, the dynamics of LG laser pulse propagating in a preformed plasma channel would definitely affect its application.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear propagation of an intense Laguerre–Gaussian laser pulse in a plasma channel*

Liu¹,

Zhang²,

Deng³

2021

Chinese Phys. B

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The nonlinear propagation of an intense Laguerre–Gaussian (LG) laser pulse in a parabolic preformed plasma channel is analyzed by means of the variational method. The evolution equation of the spot size is derived including the effects of relativistic self-focusing, preformed channel focusing, and ponderomotive self-channeling. The parametric conditions of the LG laser pulse and plasma channel for propagating with constant spot size, periodically focusing and defocusing oscillation, catastrophic focusing, and solitary waves are obtained. Compared with the laser pulse with fundamental Gaussian (FG) mode, it is found that the effect of vacuum diffraction is reduced by half and the effects of relativistic and wakefield focusing are decreased by a quarter due to the hollow transverse intensity profile of the LG laser pulse, while the effect of channel focusing is the same order of magnitude with that of the FG laser pulse. Thus, the matched condition for the intense LG laser pulse with constant spot size is released obviously, while the parameters of the laser and plasma for the existence of solitary waves nearly coincide with those of the FG laser pulse.

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Section: Evolution Equation Of Laser Spot Sizementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear propagation of an intense Laguerre–Gaussian laser pulse in a plasma channel*

Liu¹,

Zhang²,

Deng³

2021

Chinese Phys. B

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“…The longitudinal electric field in the cavitated region is uniform in the transverse direction and linear in propagation axis so that the self-injected electron bunch with duration less than about 10 fs can get monoenergetic. [7] These electron bunches have a lot of potential applications such as generation of X and γ rays, [8][9][10] ultrafast imaging, [11] cancer therapy, [12] radiotherapy, [13] etc.…”

Section: Introductionmentioning

confidence: 99%

Electron self-injection and acceleration in a hollow plasma channel driven by ultrashort intense laser pulses

Deng¹,

Liu²

2019

Chinese Phys. B

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The self-injection and acceleration of electrons in a hollow plasma channel driven by ultrashort intense laser pulses is investigated by Particle-in-Cell (PIC) simulations. It is shown that electrons from the bubble sheath will be self-injected into the hollow plasma channel and move radially towards the channel border due to the lack of focusing force in the hollow plasma channel. After several reflections near the channel wall by the strong focusing force, a self-injected electron bunch can be confined in the hollow plasma channel and quasi-phase-stably accelerated forward for the whole laserplasma interaction process. These electrons using optical and plasma-related self-injection method can be self-organized to remain in the rear of the bubble, where the accelerating electric field is transversely uniform and nearly plateau along the propagation axis. Therefore, the self-injected electron bunch can be accelerated in a steady state without obvious oscillation and has a high quality with narrow energy spread and low divergence.

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Electron trapping and acceleration in plasma wake field produced by an evolving hollow electron beam

Liu

et al. 2021

J. Plasma Phys.

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In this article, the electron trapping and acceleration in the wake field driven by an ultrarelativistic hollow electron beam is studied. When the hollow driver injects into plasma, there is a doughnut-shaped electron bubble formed because of the existence of a special ‘backflow’ beam in the centre of the electron bubble. At the same time, there is a transverse convergence of the hollow driver, which leads to the weakening of the backflow beam. This results in a local electron density transition at the rear of the bubble. During this process, there is an expansion of the longitudinal electron bubble size, and a bunch of background electrons is trapped by the wake field at the rear of the bubble. The tracks for the trapped electrons show that there are two sources: one is from the bubble sheath and the other is from the unique backflow beam. In the particle-in-cell simulation where the driving beam has initial energy of $1.0$ GeV per particle, the trapped beam can be accelerated to energy of more than $1.5$ GeV per particle and the corresponding transformer ratio is $1.5$ . With the increase of driving beam energy up to $40.0$ GeV, a transformer ratio of $1.4$ still can be achieved. By adjusting the hollow beam density, it is possible to control the trapped beam charge value and beam quality, such as its energy spread and transverse emittance.

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Acceleration and radiation of externally injected electrons in laser plasma wakefield driven by a Laguerre–Gaussian pulse

Cited by 5 publications

References 33 publications

Nonlinear propagation of an intense Laguerre–Gaussian laser pulse in a plasma channel*

Nonlinear propagation of an intense Laguerre–Gaussian laser pulse in a plasma channel*

Electron self-injection and acceleration in a hollow plasma channel driven by ultrashort intense laser pulses

Electron trapping and acceleration in plasma wake field produced by an evolving hollow electron beam

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