Enhanced betatron x-ray emission in a laser wakefield accelerator and wiggler due to collective oscillations of electrons

Mishra, S. R.; Rao, Balaji M.; Moorti, A.; Chakera, J. A.

doi:10.1103/physrevaccelbeams.25.090703

Phys. Rev. Accel. Beams

2022

DOI: 10.1103/physrevaccelbeams.25.090703

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Enhanced betatron x-ray emission in a laser wakefield accelerator and wiggler due to collective oscillations of electrons

S. R. Mishra

Balaji M. Rao²,

A. Moorti³

et al.

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Cited by 3 publications

References 31 publications

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A 90° retro-reflecting mirror based autocorrelator for temporal duration and pulse front tilt measurements of ultra-short laser pulse

Daiya,

Patidar,

Moorti

et al. 2023

Appl. Phys. B

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A 90° retro-reflecting mirror based autocorrelator for temporal duration and pulse front tilt measurements of ultra-short laser pulse

Daiya,

Patidar,

Moorti

et al. 2023

Appl. Phys. B

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High brightness betatron x-ray source driven by chirped laser pulses

Mishra,

Rao,

Moorti

et al. 2024

Physics of Plasmas

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We demonstrate high brightness betatron x-ray generation from a chirped laser pulses driven plasma accelerator. It is shown that positively chirped laser pulse leads to the initiation and enhancement of collective oscillations of electrons inside plasma bubbles, due to associated pulse front tilt (PFT). The PFT causes transverse drift of the bubbles with respect to the laser axis, which results in high brightness x-ray generation. At an optimum chirp, enhanced x-ray emission of >108 photons/pulse/sr in 0.1% BW with a critical energy of ∼18 keV was observed by a factor >2 in comparison to the case of no chirp. The role of collective oscillation in enhancing x-ray emission is also validated in the Geant4 simulations.

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Laser-driven betatron x rays for high-throughput imaging of additively manufactured materials

Senthilkumaran,

Beier,

Fourmaux

et al. 2024

Review of Scientific Instruments

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Betatron x rays from a laser wakefield accelerator provide a new avenue for high-resolution, high-throughput radiography of solid materials. Here, we demonstrate the optimization of betatron x rays for three-dimensional tomography of defects in additively manufactured (AM) alloys at a repetition rate of 2.5 Hz. Using the Advanced Laser Light Source in Varennes, Qc, we characterized the x-ray energy spectrum, spatial resolution, beam stability, and emission length from three different gas targets {He, N2, and He–N2 [He (99.5%) + N2 (0.5%)] mixture} to determine the conditions for optimized imaging resolution with minimized acquisition time. Mixed He–N2 produced the highest x-ray critical energy (19 ± 5) keV and average brightness (∼3.3×1010 photons/s/mm2/mrad2/0.1% BW) vs pure N2 gas (12 ± 4 keV and ∼1.6×1010 photons/s/mm2/mrad2/0.1% BW). The mixed gas demonstrated the best beam stability and pointing compared to pure He gas. The optimization of betatron sources at 2.5 Hz for high-resolution imaging of micrometer-scale defects in AM alloys will enable high-throughput data collection, accelerating the characterization of complex mechanical deformation processes in these materials.

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Enhanced betatron x-ray emission in a laser wakefield accelerator and wiggler due to collective oscillations of electrons

Cited by 3 publications

References 31 publications

A 90° retro-reflecting mirror based autocorrelator for temporal duration and pulse front tilt measurements of ultra-short laser pulse

A 90° retro-reflecting mirror based autocorrelator for temporal duration and pulse front tilt measurements of ultra-short laser pulse

High brightness betatron x-ray source driven by chirped laser pulses

Laser-driven betatron x rays for high-throughput imaging of additively manufactured materials

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