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Area of Science:

  • High-energy physics
  • Plasma physics
  • Laser-driven acceleration

Background:

  • Compact ultrashort X/gamma-ray sources are advancing, rivaling synchrotron brilliance.
  • Current sources have low efficiency and limited photon output (10^7-8 photons/shot).

Purpose of the Study:

  • To present a novel scheme for efficient production of collimated, ultrabright gamma-ray beams.
  • To achieve tunable photon energies up to GeV with high efficiency.

Main Methods:

  • Focusing a multi-petawatt laser pulse into a two-stage wakefield accelerator.
  • Utilizing a high-intensity laser to generate a multi-GeV electron beam in the first stage.
  • Directing laser and electron beams into a higher-density plasma region in the second stage.

Main Results:

  • Generation of over 10^12 gamma-ray photons/shot with energy conversion efficiency >10% for photons >1 MeV.
  • Achieved peak brilliance exceeding 10^26 photons s^-1 mm^-2 mrad^-2 (0.1% bandwidth at 1 MeV).
  • Tunable GeV photon energies demonstrated.

Conclusions:

  • The novel two-stage accelerator efficiently produces ultrabright, tunable GeV gamma-ray beams.
  • This advancement offers significant opportunities for fundamental and applied research.
  • The high photon yield and brilliance surpass current limitations of laser-driven sources.