AI Article Synopsis
- Researchers are using inverse Compton scattering between ultra-relativistic electrons and intense laser fields to create compact, high-energy gamma rays, which have potential applications in various fields.
- A new approach involves a cascaded laser wakefield accelerator where electrons collide with a driving laser via a reflective plasma mirror, achieving tunable quasi-monochromatic MeV gamma rays.
- The produced gamma-ray source reaches a peak brilliance of ~3 × 10²² photons/s/mm²/mrad² at 1 MeV, outperforming prior sources by an order of magnitude, which could benefit fields like nuclear resonance fluorescence and x-ray radiology.
Article Abstract
Inverse Compton scattering between ultra-relativistic electrons and an intense laser field has been proposed as a major route to generate compact high-brightness and high-energy γ-rays. Attributed to the inherent synchronization mechanism, an all-optical Compton scattering γ-ray source, using one laser to both accelerate electrons and scatter via the reflection of a plasma mirror, has been demonstrated in proof-of-principle experiments to produce a x-ray source near 100 keV. Here, by designing a cascaded laser wakefield accelerator to generate high-quality monoenergetic e-beams, which are bound to head-on collide with the intense driving laser pulse via the reflection of a 20-um-thick Ti foil, we produce tunable quasi-monochromatic MeV γ-rays (33% full-width at half-maximum) with a peak brilliance of ~3 × 10(22) photons s(-1) mm(-2) mrad(-2) 0.1% BW at 1 MeV. To the best of our knowledge, it is one order of magnitude higher than ever reported value of its kinds in MeV regime. This compact ultrahigh brilliance γ-ray source may provide applications in nuclear resonance fluorescence, x-ray radiology and ultrafast pump-probe nondestructive inspection.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4942800 | PMC |
| http://dx.doi.org/10.1038/srep29518 | DOI Listing |
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