Relativistic Doppler-boosted γ-rays in High Fields

Capdessus, R.; King, M.; Sorbo, Dario Del; Duff, M. J.; Ridgers, C. P.; McKenna, P.

doi:10.1038/s41598-018-27122-9

Cited by 15 publications

(11 citation statements)

References 49 publications

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“…As theoretically foreseen, an irradiation of plasma targets by multi-petawatt laser radiation can result in high efficiency of the laser energy conversion to the energy of gamma-ray flash [18][19][20][21][22][23][24][25][26][27][28]. Below, we present the results of multi-parametric studies of laser-target interaction for generation of bright γ-flare, aiming on parameters of ≈ 10 PW, kJ-scale laser, which will be available in the coming years.…”

Section: Introductionmentioning

confidence: 99%

High power gamma flare generation in multi-petawatt laser interaction with tailored targets

et al. 2018

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Using quantum electrodynamics particle-in-cell simulations, we optimize the gamma flare (γ-flare) generation scheme from interaction of high power petawatt-class laser pulse with tailored cryogenic hydrogen target having extended preplasma corona. We show that it is possible to generate an energetic flare of photons with energies in the GeV range and total flare energy being on a kilojoule level with an efficient conversion of the laser pulse energy to γ-photons. We discuss how the target engineering and laser pulse parameters influence the γ-flare generation efficiency. This type of experimental setup for laser-based γ source would be feasible for the upcoming high power laser facilities. Applications of high intensity γ ray beams are also discussed.1/3 rad > 1. Here the parameter ε rad = 4πr e /3λ characterizes the radiation friction effects; r e = e 2 /m e c 2 ≈ 2.8 × 10 −13 cm is the classical electron radius and λ is the laser pulse wavelength (see [14,30] and references cited therein). The normalized field amplitude a 0 = ε −1/3 rad arXiv:1809.09594v1 [physics.plasm-ph]

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Section: Introductionmentioning

confidence: 99%

High power gamma flare generation in multi-petawatt laser interaction with tailored targets

et al. 2018

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“…The largest difference would be expected for a single laser illuminating the target from one side. By comparing the results from a recent paper considering this case [25] we see that the regimes are broadly similar but that the cascade occurs at much lower intensity in the counter-propagating laser case considered here -for single-sided illumination the target is accelerated to relativistic speeds by the laser's radiation pressure, reducing the intensity in its rest-frame [25,59] (although Doppler boosting can increase the degree of collimation of the emitted gamma-ray photons [60] and perhaps also the produced pairs, which may be advantageous for some applications). Comparison to this work suggests that if dense pair plasma production is the desired outcome of an experiment then two-sided illumination of a near-critical density plasma is the ideal choice.…”

Section: Discussionmentioning

confidence: 63%

Identifying the electron–positron cascade regimes in high-intensity laser-matter interactions

2019

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Strong-field quantum electrodynamics predicts electron-seeded electron-positron pair cascades when the electric field in the rest-frame of the seed electron approaches the Sauter-Schwinger field, i.e. h =Ẽ E 1 S RF . Electrons in the focus of next generation multi-PW lasers are expected to reach this threshold. We identify three distinct cascading regimes in the interaction of counter-propagating, circularly-polarised laser pulses with a thin foil by performing a comprehensive scan over the laser intensity (from 10 23 to 5×10 24 W cm −2 ) and initial foil target density (from 10 26 to 10 31 m −3 ). For low densities and intensities the number of pairs grows exponentially. If the intensity and target density are high enough the number density of created pairs reaches the relativistically-corrected critical density, the pair plasma efficiently absorbs the laser energy (through radiation reaction) and the cascade saturates. If the initial density is too high, such that the initial target is overdense, the cascade is suppressed by the skin effect. We derive a semi-analytical model which predicts that dense pair plasmas are endemic features of these interactions for intensities above 10 24 W cm −2 provided the target's relativistic skin-depth is longer than the laser wavelength. Further, it shows that pair production is maximised in near-critical-density targets, providing a guide for near-term experiments.S RF . We can reach η∼1 for laser fields much weaker than E S as the fields themselves can rapidly accelerate electrons to high Lorentz factor, resulting in a strong Lorentz boost to E RF . Pair production by the multi-photon Breit-Wheeler process can occur if the photons emitted during Compton scattering satisfy a similar condition on their quantum efficiency parameter (defined below) χ∼1. An electromagnetic cascade can ensue if many generations of electrons and positrons can be generated by the fields. Usually this occurs via a two-step process whereby the electrons and positrons produced by the Breit-Wheeler process radiate photons by nonlinear Compton scattering which subsequently decay to further pairs and so on.Upcoming facilities, like several of those comprising the extreme light infrastructure (ELI) [1,2], are expected to reach laser intensities of > -

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“…2a and 2b respectively. From these figures we see that both the beams are highly divergent, although it has recently been shown that the γ-ray divergence can be substantially reduced by lowering the target mass [22]. These electrons and photons then propagate into the bulk of the target.…”

Section: Resultsmentioning

confidence: 93%

A channel for very high density matter-antimatter pair-jet production by intense laser-pulses

Del Sorbo,

Antonelli,

Davies

et al. 2019

Preprint

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Relativistic Doppler-boosted γ-rays in High Fields

Cited by 15 publications

References 49 publications

High power gamma flare generation in multi-petawatt laser interaction with tailored targets

High power gamma flare generation in multi-petawatt laser interaction with tailored targets

Identifying the electron–positron cascade regimes in high-intensity laser-matter interactions

A channel for very high density matter-antimatter pair-jet production by intense laser-pulses

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