The sources of super-high energetic electron at relativistic circularly-polarized laser-solid interactions in the presence of large scale pre-plasmas

Wu, Dong; Krasheninnikov, S. I.; Luan, Song; Yu, Wei

doi:10.1063/1.4972539

Cited by 7 publications

(11 citation statements)

References 13 publications

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“…After the penetration of the laser beam, the remaining OAM is close to zero. This kind of behaviour can be well described by equation (5),…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Generation of spatial uniform, temporal stable and extremely strong magnetostatic fields would be of great importance to plasma, beam physics and astrophysics [1][2][3][4][5][6][7][8][9][10][11][12]. Among many of great applications, such as the magnetically-assisted fast ignition approach [8], the axial magnetic field would collimate the relativistic electron beam to increase the coupling efficiency between the laser and the core.…”

Section: Introductionmentioning

confidence: 99%

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Magetostatic amplifier with tunable maximum by twisted-light plasma interactions

Wang

2017

Plasma Phys. Control. Fusion

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Laser beams with Laguerre-Gaussian (LG) mode carry orbital angular momentum (OAM), however when interacting with plasmas, the net OAM acquired by plasmas is basically zero after interaction. Here, we find when there exist a small magetostatic seed along laser propagation direction, the barrier would be broken, giving rise to dramatic OAM transfer from LG lasers to plasmas. Hence, the net OAM remained in plasmas system would continuously enhance the magetostatic field, until the corresponding Larmor frequency of electrons is comparable to the laser frequency in vacuum. Three-dimensional particle-in-cell (3D-PIC) simulations are performed to confirm our theory, producing space-uniform, time-stable and extremely intense magetostatic fields.

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“…After the penetration of the laser beam, the remaining OAM is close to zero. This kind of behaviour can be well described by equation (5),…”

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magetostatic amplifier with tunable maximum by twisted-light plasma interactions

Wang

2017

Plasma Phys. Control. Fusion

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“…In this part, the electron heating/acceleration at relativistically intense laser-solid interactions in the presence of large scale pre-formed plasmas [34,35] is reinvestigated by LAPINE code (Appendix B), which could include almost "all" the coupled physical mechanisms. Thanks to the "layered density" method and the coupled high-order numerical scheme and current smoothing technique, the simulation grid size can be significantly larger than the plasma Debye length.…”

Section: Applicationsmentioning

confidence: 99%

“…One has to take into account the synergetic effects of both self-generated charge separation electric fields and laser fields, in order to understand the generation of energetic electrons [30][31][32][33]. In a recent work [34,35], a two-stage electron acceleration model was proposed for relativistically intense laser-solid interactions in the presence of large scale pre-plasmas. The dependence of the electron heating efficiency on both the pre-plasma scale-length and the laser intensity was figured out.…”

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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“…State-of-the-art laser facilities are able to well produce pulses at focused intensity of I=10 20 -10 21 W cm −2 [2][3][4][5][6][7]. When such an intense laser irradiates a solid target, large amount of bound electrons will be ionized by the laser field, and the electrons are rapidly accelerated forward into the target through various possible acceleration mechanisms [8][9][10][11][12][13][14][15][16][17][18][19]. When the plasma scale length is small, the energy of electron is found to scale with the pondermotive energy = + -E m c a 1 1…”

Section: Introductionmentioning

confidence: 99%

Effects of resistive magnetic instability and electron refluxing on fast electron dynamics and bremsstrahlung radiation characteristics in relativistic laser-solid interaction

Ren¹,

Wu²,

Hoffmann³

et al. 2019

Plasma Phys. Control. Fusion

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Fast electron transport as well as bremsstrahlung emissions induced by relativistic intense laser solid interactions are investigated with a newly developed particle-in-cell (PIC) simulation code. This PIC code is capable of simulating intense laser-solid interactions by taking into account many coupled physical processes, like laser-plasma interaction, ionization dynamics, collisional dynamics, electron transport and photon emission. The target effects can be distinguished according to their intrinsic atomic properties. In this work, aluminium, copper, and gold targets with different thickness are considered. It is shown that with the fixed laser intensity of 10 20 W cm −2 , the angular distribution of bremsstrahlung emission, significantly depends on target material and target thickness. For low Z material, the electrons and the emitted photons tend to be collimated along the laser propagation direction. For high Z material, the angular distribution is broader, which is attributed to the self-generated resistive magnetic field-induced electron momentum divergence. Moreover, the simulation result shows that for Al target, the total emission energy increases with decreasing target thickness, because electron refluxing induces considerable backward emission. Comparatively, for Au target, the electron refluxing effect on the total emission energy can be ignored, because the backward emission is somewhat buried within the broad distribution.

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The sources of super-high energetic electron at relativistic circularly-polarized laser-solid interactions in the presence of large scale pre-plasmas

Cited by 7 publications

References 13 publications

Magetostatic amplifier with tunable maximum by twisted-light plasma interactions

Magetostatic amplifier with tunable maximum by twisted-light plasma interactions

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

Effects of resistive magnetic instability and electron refluxing on fast electron dynamics and bremsstrahlung radiation characteristics in relativistic laser-solid interaction

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