Dynamic focusing of laser driven positron jets by self-generated fields

Kim, J; Link, A.; Canning, D.; Fitzsimmons, P.; Fooks, J. A.; Kerr, S.; Ma, T.; Manuel, M. J.-E.; Mariscal, D.; Wallace, R. J.; Williams, G. J.; Willingale, L.; Beg, F. N.; Chen, H

doi:10.1088/1367-2630/abcc1f

Cited by 3 publications

(4 citation statements)

References 23 publications

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“…Laser-driven positron sources have attracted widespread attention for their diverse applications in various areas, such as electron-positron collider [1,2], positron annihilation spectroscopy (PAS) [3,4], laboratory astrophysics [5,6], and injection into plasma-based positron accelerators [7,8]. In these applications, high-quality positron pulses with high energy, high density, short duration and low divergence angle are highly desired.…”

Section: Introductionmentioning

confidence: 99%

“…If positrons are used as injectors for plasma accelerators, small beam size and short pulse duration are also demanded to match millimeter-scale acceleration length in the wakefield [7]. Moreover, to enable stable wakefield acceleration, the positron properties such as energy, emittance, and charge also should be carefully optimized [7,8,11,12].…”

Section: Introductionmentioning

confidence: 99%

“…However, only a small amount of expanding positrons within a narrow band of energies can be focused and collimated when applying external magnetic fields. Kim et al [8] experimentally demonstrated that laser-driven relativistic positron beams could be focused and accelerated by self-generated target sheath electric fields from curved target rear sides. Further simulations showed that the beam density and peak energy were effectively manipulated by the radius of target curvature.…”

Section: Introductionmentioning

confidence: 99%

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Collimation, compression and acceleration of isotropic hot positrons by an intense vortex laser

Cao,

Hu,

Zou

et al. 2023

New J. Phys.

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Laser-driven positron sources, characterized by short pulse width, small focal spot and high energy, are promising for potential applications, e.g. electron–positron collider and positron annihilation spectroscopy. However, the broad divergence angle and wide pulse width during the laser-driven positron transport are extremely unfavorable for achieving high spatiotemporal resolution. In this paper, we propose a novel method to manipulate the positrons by using a left-hand circularly-polarized Laguerre–Gaussian (LG) laser pulse. Using the LG laser with a intensity of 1.2 × 10 21 W c m − 2 and a duration of a few cycles, three-dimensional particle-in-cell simulations reveal that isotropic hot positrons can be effectively captured, collimated, compressed, and accelerated due to the unique field structure of the LG laser. A high-quality positron bunch is obtained with a peak divergence angle of 1∘, an average pulse duration of 0.5 fs, a maximum energy of 450 MeV, and a density of 70 times that of the initial electron source. A damping vibration model is also formulated to explain qualitatively the quality improvement of the positrons.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Collimation, compression and acceleration of isotropic hot positrons by an intense vortex laser

Cao,

Hu,

Zou

et al. 2023

New J. Phys.

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“…This can be achieved by using low-density pre-formed plasma at the target surface, since this ablated pre-plasma can significantly improve both the laser absorption and fast electron generation [20][21][22]. Other methods, such as using either a Helmholtz coil or curved targets [23,24], have also been proposed to increase the positron density due to the focusing of the positron by an external magnetic field or self-generated fields.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of electron refluxing in laser-gas interactions for enhanced positron generation

Zhang¹,

Wu²,

Zhang³

et al. 2022

Plasma Phys. Control. Fusion

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We report an experimental investigation of a laser-gas-converter approach for generating high-yield ultrashort MeV positrons. We observe that MeV electrons with a high charge of several tens of nC can be well generated by a ∼ 6 J , ∼ 40 f s laser interacting with a high-density gas jet. However, it is shown that the propagation of the highly charged electron beam is significantly inhibited because the electrons are reflected by the sheath potential in the density decreasing region of the gas target, thus leading to a low positron yield. Consequently, by using an integrated nozzle-converter design to eliminate the density falling ramp of the gas target such that the electron refluxing is inhibited, we observe a significant enhancement of positron yield (up to a factor of 15), finally reaching a positron yield of 5 × 10 8 s r − 1 . This high-yield ultrashort MeV positron may have great potential toward the simulation of astrophysical pair plasma.

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Bright X/$$\gamma$$-ray emission and lepton pair production by strong laser fields: a review

Yu,

Liu,

Zhao

et al. 2024

Rev. Mod. Plasma Phys.

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The advent of high-power ultra-short laser pulses opens up new frontiers of relativistic non-linear optics, high energy density physics and laboratory astrophysics. As the laser electric field in the particle rest frame approaches the Schwinger field $$E_{cr} = 1.3 \times 10^{18}\,\textrm{V} \textrm{m}^{-1}$$ E cr = 1.3 × 10 18 V m - 1 , the laser interaction with matter enters into the quantum electrodynamics (QED) dominated regime, where extremely rich non-linear phenomena take place, such as a violent acceleration of charged particles, copious lepton pair production, and ultra-brilliant X/$$\gamma$$ γ -ray emission. Among them, X/$$\gamma$$ γ -ray emission based on the laser-plasma is generally characterized by large photon flux, high brilliance, small source size, and high photon energy, which can even annihilate into lepton pairs by colliding with photons. Though various schemes have been proposed for bright high-energy photon emission and lepton generation and acceleration, many predictions remain to be confirmed and thoroughly tested in experiments. In this review, we introduce recent advances in bright X/$$\gamma$$ γ -ray radiation and lepton pair generation in the QED regime by the interaction of relativistic intense lasers with various plasma targets. The characteristics of the radiation and secondary particles generated via these schemes are summarized, and the experimental progresses are elaborated.

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Dynamic focusing of laser driven positron jets by self-generated fields

Cited by 3 publications

References 23 publications

Collimation, compression and acceleration of isotropic hot positrons by an intense vortex laser

Collimation, compression and acceleration of isotropic hot positrons by an intense vortex laser

Inhibition of electron refluxing in laser-gas interactions for enhanced positron generation

Bright X/$$\gamma$$-ray emission and lepton pair production by strong laser fields: a review

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