Two-stage <i>γ</i> ray emission via ultrahigh intensity laser pulse interaction with a laser wakefield accelerated electron beam

Bake, Mamat Ali; Tursun, Aynisa; Aimidula, Aimierding; Xie, Bai-Song

doi:10.1088/2058-6272/ab988a

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…The laserplasma accelerators are an alternative way to generate highenergy X-and γ-rays [9][10][11][12] by synchrotron radiation [13,14], bremsstrahlung [15,16], and nonlinear Compton scattering [17][18][19][20][21][22] processes. Accordingly, recent studies involving both theory and experiments have shown that energetic, collimated, and brilliant γ-rays can be obtained by an all-optical method by intense laser interaction with plasmas [23][24][25][26][27][28][29]. However, most of them do not include the γ beam orbital angular momentum (OAM), which also has potential application in many areas.…”

Section: Introductionmentioning

confidence: 99%

Bright γ-ray source with large orbital angular momentum from the laser near-critical-plasma interaction

Bake

Tang

Xie

2022

Plasma Sci. Technol.

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We propose a laser-plasma based new method to generate bright $\gamma$-rays carrying large orbital angular momentum, by interacting a circularly polarized Laguerre--Gaussian laser pulse with a near-critical hydrogen plasma confined in an over-dense solid tube. In the first stage of the interaction, it is found via fully relativistic three-dimensional particle-in-cell simulations that high-energy helical electron beams with large orbital angular momentum are generated. In the second stage, this electron beam interacts with the laser pulse reflected from the plasma disc behind the solid tube, and helical $\gamma$ beams are generated with the same topological structure having the electron beams. The results show that the electrons receive angular momentum from the drive laser, which can be further transferred to the $\gamma$ photons during the interaction. The $\gamma$ beam orbital angular momentum is strongly dependent on the laser topological charge $l$ and laser intensity $a_0$, which scales as $L_{\gamma} \propto a^{4}_{0}$. A short (duration of 5 fs) isolated helical $\gamma$ beam with an angular momentum of $-3.3\times10^{-14}$ kg m$^2$/s is generated by using the Laguerre--Gaussian laser pulse with $l=2$. The peak brightness of the helical $\gamma$ beam reaches $1.22\times10^{24}$ photons s$^{-1}$mm$^{-2}$mrad$^{-2}$ per 0.1$\%$BW (at 10 MeV), and the laser-to-$\gamma$-ray angular momentum conversion rate is approximately $2.1\%$.

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Section: Introductionmentioning

confidence: 99%

Bright γ-ray source with large orbital angular momentum from the laser near-critical-plasma interaction

Bake

Tang

Xie

2022

Plasma Sci. Technol.

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“…In a recent study, we investigated an efficient method of generating high-energy γ-photons using the interaction between a wakefield-accelerated electron beam and a counter-propagating high-intensity laser pulse with a compound target, and obtained two groups of γ-rays with a small divergence angle. [31] Chang et al [32] proposed a new resonance acceleration scheme for generating relativistic electron bunches and brilliant γ-rays, used a three-dimensional particle-in-cell (PIC) simulation and reported γ-ray pulses with a peak brilliance of 10 25 photons/s/mm 2 /mrad 2 /0.1%BW (15 MeV) at a laser intensity of 1.9 × 10 23 W/cm 2 . More recently, Zhang et al [33] reported nano-micro array thin target for ultra-short (440 as) and ultra-bright [10 24 photons/s/mm 2 /mrad 2 /0.1%BW (15 MeV)] γ-ray emission with high conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Ultrabright γ-ray emission from the interaction of an intense laser pulse with a near-critical-density plasma*

et al. 2021

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An efficient scheme for generating ultrabright γ-rays from the interaction of an intense laser pulse with a near-critical-density plasma is studied by using the two-dimensional particle-in-cell simulation including quantum electrodynamic effects. We investigate the effects of target shape on γ-ray generation efficiency using three configurations of the solid foils attached behind the near-critical-density plasma: a flat foil without a channel (target 1), a flat foil with a channel (target 2), and a convex foil with a channel (target 3). When an intense laser propagates in a near-critical-density plasma, a large number of electrons are trapped and accelerated to GeV energy, and emit γ-rays via nonlinear betatron oscillation in the first stage. In the second stage, the accelerated electrons collide with the laser pulse reflected from the foil and emit high-energy, high-density γ-rays via nonlinear Compton scattering. The simulation results show that compared with the other two targets, target 3 affords better focusing of the laser field and electrons, which decreases the divergence angle of γ-photons. Consequently, denser and brighter γ-rays are emitted when target 3 is used. Specifically, a dense γ-ray pulse with a peak brightness of 4.6 × 1026 photons/s/mm2/mrad2/0.1%BW (at 100 MeV) and 1.8 × 1023 photons/s/mm2/mrad2/0.1%BW (at 2 GeV) are obtained at a laser intensity of 8.5 × 1022 W/cm2 when the plasma density is equal to the critical plasma density n c. In addition, for target 3, the effects of plasma channel length, foil curvature radius, laser polarization, and laser intensity on the γ-ray emission are discussed, and optimal values based on a series of simulations are proposed.

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“…Recently, several studies have indicated that ultrahighintensity laser-plasma interaction could trigger the processes of γ photon emission and electron-positron pair production [10,11,[18][19][20][21][22][23]. Various mechanisms have been proposed [24][25][26][27][28] and, simultaneously, considerable theoretical and numerical studies have been undertaken to provide detailed physical explanations for these QED processes [5][6][7][8][9][10][11][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. If the generation process of the γ photon can be triggered, it will produce a dense beam of positrons in the laboratory, which will facilitate several new fields of research [12,14,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Photon and positron production by ultrahigh-intensity laser interaction with various plasma foils

Bake¹,

Elaji²

2021

Plasma Sci. Technol.

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The generation of γ photons and positrons using an ultrahigh-intensity laser pulse interacting with various plasma solid foils is investigated with a series of quantum electrodynamic particle-in-cell (PIC) simulations. When ultrahigh-intensity lasers interact with plasma foils, a large amount of the laser energy is converted into γ photon energy. The simulation results indicate that for a fixed laser intensity with different foil densities, the conversion efficiency of the laser to γ photons and the number of produced photons are highly related to the foil density. We determine the optimal foil density by PIC simulations for high conversion efficiencies as approximately 250 times the critical plasma density, and this result agrees very well with our theoretical assumptions. Four different foil thicknesses are simulated and the effects of foil thickness on γ photon emission and positron production are discussed. The results indicate that optimal foil thickness plays an important role in obtaining the desired γ photon and positron production according to the foil density and laser intensity. Further, a relation between the laser intensity and conversion efficiency is present for the optimal foil density and thickness.

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Two-stage γ ray emission via ultrahigh intensity laser pulse interaction with a laser wakefield accelerated electron beam

Cited by 4 publications

References 33 publications

Bright γ-ray source with large orbital angular momentum from the laser near-critical-plasma interaction

Bright γ-ray source with large orbital angular momentum from the laser near-critical-plasma interaction

Ultrabright γ-ray emission from the interaction of an intense laser pulse with a near-critical-density plasma*

Photon and positron production by ultrahigh-intensity laser interaction with various plasma foils

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