A bremsstrahlung gamma-ray source based on stable ionization injection of electrons into a laser wakefield accelerator

Döpp, A.; Guillaume, E.; Thaury, C.; Lifschitz, Agustín; Sylla, F.; Goddet, J. P.; Tafzi, Amar; Iaquanello, G.; Lefrou, T.; Rousseau, P.; Conejero, Emilio Asensi; Ruiz, Camilo; Phuoc, K. Ta; Malka, Victor

doi:10.1016/j.nima.2016.01.086

Cited by 33 publications

(27 citation statements)

References 36 publications

(36 reference statements)

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“…The structure of the electric field inside the wakefield resembles the one found in a conventional radio-frequency particle accelerator, yet, it is at least three orders higher in magnitude (electric fields of the order of 100 GV/m). The possibility of obtaining compact ultra-short 6,7 and ultra-bright electron bunches [8][9][10] and radiation sources [11][12][13][14][15] explains why the scientific community is so excited about the prospects of LWFA.…”

Section: Introductionmentioning

confidence: 99%

Electron energy increase in a laser wakefield accelerator using up-ramp plasma density profiles

Aniculaesei

Pathak

Kim

et al. 2019

Sci Rep

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The phase velocity of the wakefield of a laser wakefield accelerator can, theoretically, be manipulated by shaping the longitudinal plasma density profile, thus controlling the parameters of the generated electron beam. We present an experimental method where using a series of shaped longitudinal plasma density profiles we increased the mean electron peak energy more than 50%, from 175 ± 1 MeV to 262 ± 10 MeV and the maximum peak energy from 182 MeV to 363 MeV. The divergence follows closely the change of mean energy and decreases from 58.9 ± 0.45 mrad to 12.6 ± 1.2 mrad along the horizontal axis and from 35 ± 0.3 mrad to 8.3 ± 0.69 mrad along the vertical axis. Particle-in-cell simulations show that a ramp in a plasma density profile can affect the evolution of the wakefield, thus qualitatively confirming the experimental results. The presented method can increase the electron energy for a fixed laser power and at the same time offer an energy tunable source of electrons.

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Section: Introductionmentioning

confidence: 99%

Electron energy increase in a laser wakefield accelerator using up-ramp plasma density profiles

Aniculaesei

Pathak

Kim

et al. 2019

Sci Rep

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“…Both methods yielded a dose estimation of 30 µGy/shot@1 m. The dose per minute was still a big difference relative to a conventional industrial CT system, and was mainly limited by the 0.8 J laser pulse energy and 0.05 Hz system repetition. High beam charge acceleration could generate an electron bunch with the charge of nC per J laser energy 24 , 35 , which would increase the radiation dose of single laser pulse by an order of magnitude. With the further development in laser technology, high peak power and high repetition rate laser systems will become more industrial and commercial 36 .…”

Section: Discussionmentioning

confidence: 99%

“…To improve the photon yield, in 2016, Döpp et al . 24 used argon or nitrogen gas in the LWFA, which supported a maximum charge of almost 1 nC per shot with a 1.1 J laser pulse. The bremsstrahlung photons were expected to have of ~10 −4 J per shot, while the spot size was below 100 μm.…”

Section: Introductionmentioning

confidence: 99%

Towards high-energy, high-resolution computed tomography via a laser driven micro-spot gamma-ray source

Wu¹,

Zhu²,

Li³

et al. 2018

Sci Rep

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Computed Tomography (CT) is a powerful method for non-destructive testing (NDT) and metrology awakes with expanding application fields. To improve the spatial resolution of high energy CT, a micro-spot gamma-ray source based on bremsstrahlung from a laser wakefield accelerator was developed. A high energy CT using the source was performed, which shows that the resolution of reconstruction can reach 100 μm at 10% contrast. Our proof-of-principle demonstration indicates that laser driven micro-spot gamma-ray sources provide a prospective way to increase the spatial resolution and toward to high energy micro CT. Due to the advantage in spatial resolution, laser based high energy CT represents a large potential for many NDT applications.

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“…Email: j.benlliure@usc.es ous mechanisms [4] such as betatron, synchrotron, Thomson scattering, Compton scattering or from interactions in a secondary solid target converter [5] .…”

Section: Introductionmentioning

confidence: 99%

Improved stability of a compact vacuum-free laser-plasma X-ray source

Martín

Benlliure

Cortina-Gil

et al. 2020

High Pow Laser Sci Eng

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We report the development of a stable high-average power X-ray source generated by the interaction of ultrashort laser pulses (35 fs, 1 mJ, 1 kHz) with a solid target in air. The achieved source stability, which is essential for the applications foreseen for these laser-driven plasma accelerators, is due to the combination of precise positioning of the target on focus and the development of a fast rotating target system able to ensure the refreshment of the material at every shot while minimizing positioning errors with respect to the focal spot. This vacuum-free laser-plasma X-ray source provides an average dose rate of 1.5 Sv/h at 30 cm and a repeatability better than 93% during more than 36 min of continuous operation per target.

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A bremsstrahlung gamma-ray source based on stable ionization injection of electrons into a laser wakefield accelerator

Abstract: International audienc

Cited by 33 publications

References 36 publications

Electron energy increase in a laser wakefield accelerator using up-ramp plasma density profiles

Electron energy increase in a laser wakefield accelerator using up-ramp plasma density profiles

Towards high-energy, high-resolution computed tomography via a laser driven micro-spot gamma-ray source

Improved stability of a compact vacuum-free laser-plasma X-ray source

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