Numerical study of positron production with short-pulse high-intensity lasers

Hanuš, V.; Drska, L.; d’Humières, E.; Tikhonchuk, V. T.

doi:10.1017/s0263034613001043

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…Unlike methods used in Refs. [31][32][33], we will not separate the bremsstrahlung from the laser plasma interaction. To simulate the bremsstrahlung and nonlinear Compton scattering in the laser plasma interaction, MC method has been implemented in our 2D PIC code.…”

Section: B Simulation Methodsmentioning

confidence: 99%

Photon emission by bremsstrahlung and nonlinear Compton scattering in the interaction of ultraintense laser with plasmas

Wan

Jia

et al. 2017

Eur. Phys. J. D

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By implementing the bremsstrahlung with Monte Carlo algorithm into the particle-in-cell code, the bremsstrahlung and nonlinear Compton scattering can be studied simultaneously in comparison way in the laser plasma interactions. The simulations are performed for the laser of different intensities interacting with either low-Z or high-Z target. The relative strength of the two photon emission from bremsstrahlung and nonlinear Compton scattering are compared. The result shows that when an ultrastrong intensity laser interacting with a thin and relative high Z target the nonlinear Compton scattering is dominant, however, when the laser intensity I < 10 22 W/cm 2 , the photon emission contributed by bremsstrahlung is comparable to that from nonlinear Compton scattering. In this case the usual ignorable of bremsstrahlung need to be reconsidered.

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Section: B Simulation Methodsmentioning

confidence: 99%

Photon emission by bremsstrahlung and nonlinear Compton scattering in the interaction of ultraintense laser with plasmas

Wan

Jia

et al. 2017

Eur. Phys. J. D

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“…the particle-in-cell (PIC) method. Such approach is appropriate for bulk targets and it has been applied in several studies [32][33][34][35]. However, for thinner targets and fast electron sources with very high current densities, collective effects during the electron transport may become important and even dominant, the assumption that the target is static and undisturbed may be violated due to its significant expansion, and electron refluxing cannot be neglected.…”

Section: Introductionmentioning

confidence: 99%

Simulations of bremsstrahlung emission in ultra-intense laser interactions with foil targets

Vyskočil

Klimo

Weber

2018

Plasma Phys. Control. Fusion

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Bremsstrahlung emission from interactions of short ultra-intense laser pulses with solid foils is studied using particle-in-cell (PIC) simulations. A module for simulating bremsstrahlung has been implemented in the PIC loop to self-consistently account for the dynamics of the laser-plasma interaction, plasma expansion, and the emission of gamma ray photons. This module made it possible to study emission from thin targets, where refluxing of hot electrons plays an important role. It is shown that the angular distribution of the emitted photons exhibits a four-directional structure with the angle of emission decreasing with the increase of the width of the target. Additionally, a collimated forward flash consisting of high energy photons has been identified in thin targets. The conversion efficiency of the energy of the laser pulse to the energy of the gamma rays rises with both the driving pulse intensity, and the thickness of the target. The amount of gamma rays also increases with the atomic number of the target material, despite a lower absorption of the driving laser pulse. The angular spectrum of the emitted gamma rays is directly related to the increase of hot electron divergence during their refluxing and its measurement can be used in experiments to study this process.

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“…When an intense laser beam irradiates a solid target, relativistic electrons can be produced in front of the target through the direct-laser-heating/acceleration mechanism. These energetic electrons can propagate through the bulk solid and trigger abundant plasma-atomic processes, which typically include resistive return current, resistive electric and magnetic fields [21], bulk heating and ionization dynamics [22], Bremsstrahlung X-ray generation [23][24][25] and also ion accelerations [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Particle-in-cell simulations of laser–plasma interactions at solid densities and relativistic intensities: the role of atomic processes

et al. 2018

High Pow Laser Sci Eng

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Direct studies of intense laser-solid interactions is still of great challenges, because of the many coupled physical mechanisms, such as direct laser heating, ionization dynamics, collision among charged particles, and electrostatic or electromagnetic instabilities, to name just a few. Here, we present a full particle-in-cell simulation (PIC) framework, which enables us to calculate laser-solid interactions in a "first principle" way, covering almost "all" the coupled physical mechanisms. Apart from the mechanisms above, the numerical self-heating of PIC simulations, which usually appears in solid-density plasmas, is also well controlled by the proposed "layered-density" method. This method can be easily implemented into the state-of-the-art PIC codes. Especially, the electron heating/acceleration at relativistically intense laser-solid interactions in the presence of large scale pre-formed plasmas is re-investigated by this PIC code. Results indicate that collisional damping (even though it is very week) can significantly influence the electron heating/acceleration in front of the target. Furthermore the Bremsstrahlung radiation will be enhanced by 2 ∼ 3 times when the solid is dramatically heated and ionized. For the considered case, where laser is of intensity 10 20 W/cm 2 and pre-plasma in front of the solid target is of scale-length 10 µm, collision damping coupled with ionization dynamics and Bremsstrahlung radiations is shown to lower the "cut-off" electron energy by 25%. In addition, the resistive electromagnetic fields due to Ohmic-heating also play a non-ignorable role and must be included in realistic laser-solid interactions.

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Numerical study of positron production with short-pulse high-intensity lasers

Cited by 6 publications

References 14 publications

Photon emission by bremsstrahlung and nonlinear Compton scattering in the interaction of ultraintense laser with plasmas

Photon emission by bremsstrahlung and nonlinear Compton scattering in the interaction of ultraintense laser with plasmas

Simulations of bremsstrahlung emission in ultra-intense laser interactions with foil targets

Particle-in-cell simulations of laser–plasma interactions at solid densities and relativistic intensities: the role of atomic processes

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