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Attosecond betatron radiation pulse train.

Vojtěch Horný1,2, Miroslav Krůs3, Wenchao Yan4,5

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Researchers enhanced X-ray pulse resolution using laser-plasma accelerators. Spatial modulation of electron bunches generates sub-femtosecond X-ray pulses, improving temporal resolution by tenfold for advanced diagnostics.

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Area of Science:

  • Physics
  • Laser-driven particle acceleration
  • X-ray science

Background:

  • High-intensity X-ray sources are crucial for science, technology, and medicine.
  • Betatron radiation from laser-plasma accelerators produces femtosecond X-ray pulses from micrometer sources.
  • Current sources offer limited temporal resolution for ultrafast phenomena.

Purpose of the Study:

  • To demonstrate enhanced temporal resolution of X-ray sources.
  • To achieve sub-femtosecond X-ray pulse generation.
  • To explore applications in ultrafast process sampling.

Main Methods:

  • Particle-in-cell simulations were employed.
  • Spatial modulation of relativistic electron bunches was simulated.
  • Interaction with a co-propagating laser beam induced modulation.

Main Results:

  • Temporal resolution was enhanced by an order of magnitude.
  • Generation of a train of equidistant sub-femtosecond X-ray pulses was achieved.
  • Pulse train spacing is tunable via modulation laser wavelength.

Conclusions:

  • The proposed method significantly improves X-ray source temporal resolution.
  • The technique is achievable with current experimental technologies.
  • Potential for stroboscopic sampling of fundamental ultrafast processes exists.