Collimated electron sheet driven by an intense Laguerre–Gaussian pulse

Jiang, Ching-Long; Wang, W. P.; Dong, H.; Leng, Yuxin; Li, R. X.; Xu, Zhizhan

doi:10.1063/5.0055240

Cited by 4 publications

(1 citation statement)

References 49 publications

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“…In this scheme, the radial ponderomotive force confines electrons near the laser axis, and the oscillatory longitudinal electric field of the laser pulse directly accelerates them. DLA using Laguerre-Gaussian (LG) laser beams has been studied using test particle simulations and PIC simulations for targets such as underdense plasmas, wires, and plasma mirrors (PMs) [26][27][28][29][30][31]. In these works, the role of the ponderomotive force and the direct laser field interaction with electrons were studied.…”

Section: Introductionmentioning

confidence: 99%

Direct laser acceleration of electrons from a plasma mirror by an intense few-cycle Laguerre–Gaussian laser and its dependence on the carrier-envelope phase

Pae¹,

Kim²,

Pathak³

et al. 2022

Plasma Phys. Control. Fusion

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A direct acceleration scheme to generate high-energy, high-charge electron beams with an intense, few-cycle Laguerre-Gaussian laser pulse was investigated using three dimensional particle-in-cell simulations. In this scheme, an intense Laguerre-Gaussian laser pulse was irradiated onto a solid density plasma slab. When the laser pulse is reﬂected, electrons on the target front surface are injected into the longitudinal electric ﬁeld of the laser and accelerated further. We found that the carrier-envelope phase of the few-cycle laser pulse plays a key role in the electron injection and acceleration process. Using a three-cycle Laguerre-Gaussian laser pulse with a0= 2 and an appropriate carrier-envelope phase, about 60 pC electron beam could be obtained at a maximum energy of 16 MeV. In comparison, when a laser pulse with mismatched carrier-envelope phase was used, a total of 4 pC electron beam with a maximum energy of 3.5 MeV was obtained. A linear scaling of electron energy to the laser strength was shown up to a0 = 100 at which a quasimonoenergetic electron beam of 850 MeV energy with a charge amounting to 600 pC could be obtained. These results demonstrate that high-energy electron beams can be stably generated through direct laser acceleration using a carrier-envelope phase-controlled intense few-cycle Laguerre-Gaussian laser pulse.

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Section: Introductionmentioning

confidence: 99%

Direct laser acceleration of electrons from a plasma mirror by an intense few-cycle Laguerre–Gaussian laser and its dependence on the carrier-envelope phase

Pae¹,

Kim²,

Pathak³

et al. 2022

Plasma Phys. Control. Fusion

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Self-generated magnetic collimation mechanism driven by ultra-intense LG laser

Dong,

Wang,

et al. 2023

Physics of Plasmas

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Collimation control of energetic plasma beams is crucial in the laser–plasma field. In this paper, we report on a self-collimated acceleration scheme for a plasma beam using an ultra-intense Laguerre–Gaussian (LG) laser irradiating a solid target. Three-dimensional (3D) particle-in-cell simulations show that a plasma beam with a high current density is stably formed by the radiation pressure of the hollow LG laser. The initial interaction of LG laser with solid target can be approximately researched by a deformable mirror model. Under the effect of the ponderomotive force of the LG laser, the plasma converges in the center axis to form a narrow beam. An elongated strong-magnetic tunnel (B ∼ 2 kT) is self-generated around the plasma beam, capable of trapping some electrons in a region with a radius of less than 500 nm (r < 500 nm). Compared with the case driven by the conventional Gaussian laser, the beam radius size is dramatically reduced from the microscale to hundreds on the nanoscale. The beam density is increased by at least ten times. Such an interesting scheme can provide a feasible and efficient way to achieve and enhance the collimation of energetic particle beams, which may benefit the general applications of fast ignition in inertial fusion, radiotherapy, realization of high-energy density states, and so on.

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Proton acceleration with multi-peak energy spectra tailored by vortex laser

He,

Wang,

Dong

et al. 2023

Physics of Plasmas

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A novel flying cascaded acceleration mechanism is proposed to generate energetic proton beams with multi-peak energy spectra using a circularly polarized (CP) Laguerre–Gaussian (LG) laser pulse in three-dimensional particle-in-cell simulations. Simulations show that the protons are initially accelerated and compressed into the beam center via the radiation pressure of the CP LG (σz = −1) laser pulse. Then, they are tailored by flying dipolar electric fields in this LG laser, resulting in a multi-peak energy spectrum. Each shaped proton peak exhibits a narrow energy spread of ∼5% and high flux of ∼2 × 108 protons/MeV at giga-electron volts energy. Such a flying cascaded acceleration mechanism extends the energy spectra of proton beams from monoenergetic to multi-peak structure, thereby potentially enhancing the generation efficiency of monoenergetic proton beams for various applications, such as proton-induced spallation reactions, proton radiography, and proton therapy.

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Collimated electron sheet driven by an intense Laguerre–Gaussian pulse

Cited by 4 publications

References 49 publications

Direct laser acceleration of electrons from a plasma mirror by an intense few-cycle Laguerre–Gaussian laser and its dependence on the carrier-envelope phase

Direct laser acceleration of electrons from a plasma mirror by an intense few-cycle Laguerre–Gaussian laser and its dependence on the carrier-envelope phase

Self-generated magnetic collimation mechanism driven by ultra-intense LG laser

Proton acceleration with multi-peak energy spectra tailored by vortex laser

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