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

Pae, Ki Hong; Kim, Chul Min; Pathak, Vishwa Bandhu; Ryu, Chang‐Mo; Nam, Chang Hee

doi:10.1088/1361-6587/ac5a0a

Cited by 4 publications

(1 citation statement)

References 40 publications

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“…In an attempt to improve electron acceleration, several studies also considered radially polarized laser beams [37] and higher-order Gaussian beams [38] . Recently, there has been an increased interest in utilizing ultra-high-intensity laser beams with helical wave-fronts for electron acceleration in various setups, including vacuum acceleration [39][40][41][42] , laser wakefield acceleration [43,44] and microstructural target electron acceleration [45] .…”

Section: Introductionmentioning

confidence: 99%

Electron pulse train accelerated by a linearly polarized Laguerre–Gaussian laser beam

Shi

Blackman

Zhu

et al. 2022

High Pow Laser Sci Eng

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A linearly polarized Laguerre-Gaussian (LP-LG) laser beam with a twist index l = −1 has field structure that fundamentally differs from the field structure of a conventional linearly polarized Gaussian beam. Close to the axis of the LP-LG beam, the longitudinal electric and magnetic fields dominate over the transverse components. This structure offers an attractive opportunity to accelerate electrons in vacuum. It is shown, using three dimensional particle-incell simulations, that this scenario can be realized by reflecting an LP-LG laser off a plasma with a sharp density gradient. The simulations indicate that a 600 TW LP-LG laser beam effectively injects electrons into the beam during the reflection. The electrons that are injected close to the laser axis experience a prolonged longitudinal acceleration by the longitudinal laser electric field. The electrons form distinct monoenergetic bunches with a small divergence angle. The energy in the most energetic bunch is 0.29 GeV. The bunch charge is 6 pC and its duration is ∼ 270 as. The divergence angle is just 0.57 • (10 mrad). By using a linearly polarized rather than a circularly polarized Laguerre-Gausian beam, our scheme makes it easier to demonstrate the electron acceleration experimentally at a high-power laser facility.

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Section: Introductionmentioning

confidence: 99%

Electron pulse train accelerated by a linearly polarized Laguerre–Gaussian laser beam

Shi

Blackman

Zhu

et al. 2022

High Pow Laser Sci Eng

View full text Add to dashboard Cite

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Role of field ionization in laser pulse evolution during interaction of long laser pulse with gaseous hydrogen atoms

Khalilzadeh,

Chakhmachi,

Dehghani

2024

Contrib. Plasma Phys

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In this paper, the laser pulse evolution arising from the field ionization during the interaction of a long laser pulse with gaseous hydrogen atoms is investigated using the kinetic 1D‐3 V Particle‐In‐Cell (PIC) Smilei simulation code. After performing various simulations, it is shown that the field ionization of hydrogen atoms has a non‐negligible effect on the evolution of the laser pulse compared to the pre‐ionized plasma case. The results of our simulations show that the amount of these evolutions is strongly dependent on the parameters of the laser and initial ionization assumed. In this regard, two main mechanisms are responsible for the changes in the generated radiations and then the evolution of the laser pulse. When the average degree of ionization is weak, the backscattered Raman radiations can provide the necessary conditions for the chaotic behavior to occur and the laser pulse to evolve. When the laser and plasma pulse parameters (such as the laser pulse amplitude, hydrogen atoms density, and the rise time of pulse) are selected so that a strong space charge field is formed, the wave breaking (which happened faster due to density changes during the field ionization) is the main factor for evolutions in the laser pulse.

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Electron injection and acceleration in a twisted laser driven by the light fan

Tang,

Hao,

Shi

2024

High Pow Laser Sci Eng

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The longitudinal fields of a tightly focused Laguerre–Gaussian (LG) laser can be used to accelerate electron pulse trains when it is reflected from a solid plasma. However, the normal transverse mode of laser beams in high-power laser systems is approximately Gaussian. A routine and reliable way to obtain high-intensity LG lasers in experiments remains a major challenge. One approach involves utilizing a solid plasma with a ‘light fan’ structure to reflect the Gaussian laser and obtain a relativistic intense LG laser. In this work, we propose a way to combine the mode transformation of a relativistic laser and the process of electron injection and acceleration. It demonstrates that by integrating a nanowire structure at the center of the ‘light fan’, electrons can be efficiently injected and accelerated during the twisted laser generation process. Using three-dimensional particle-in-cell simulations, it is shown that a circularly polarized Gaussian beam with ${a}_0=20$ can efficiently inject electrons into the laser beam in interaction with the solid plasma. The electrons injected close to the laser axis are driven by a longitudinal electric field to gain longitudinal momentum, forming bunches with a low energy spread and a small divergence angle. The most energetic bunch exhibits an energy of 310 MeV, with a spread of 6%. The bunch charge is 57 pC, the duration is 400 as and the divergence angle is less than 50 mrad. By employing Gaussian beams, our proposed approach has the potential to reduce experimental complexity in the demonstrations of twisted laser-driven electron acceleration.

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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

Cited by 4 publications

References 40 publications

Electron pulse train accelerated by a linearly polarized Laguerre–Gaussian laser beam

Electron pulse train accelerated by a linearly polarized Laguerre–Gaussian laser beam

Role of field ionization in laser pulse evolution during interaction of long laser pulse with gaseous hydrogen atoms

Electron injection and acceleration in a twisted laser driven by the light fan

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