Speaker
Description
We investigate an efficient mechanism for gamma-ray generation based on
relativistic two-wave resonance driven by ultra-intense
counter-propagating laser pulses in a strongly magnetized plasma. In the
presence of a sufficiently strong external magnetic field, electrons can
simultaneously resonate with both laser fields, enabling sustained and
coherent energy transfer from the electromagnetic waves to relativistic
particles. This dual-resonance configuration leads to rapid electron
energization and enhanced high-frequency radiation.
Using a combination of analytical modeling and particle-in-cell
simulations that incorporate radiation reaction effects, we identify the
parameter regime in which relativistic two-wave resonance is established
and maintained. When the resonance condition is satisfied, electron
trajectories become strongly phase-correlated with the laser fields and
exhibit pronounced transverse oscillations. These dynamics significantly
enhance synchrotron emission, resulting in efficient gamma-ray
production. The energy conversion occurs on timescales comparable to the
laser period, demonstrating a rapid channel for transferring laser
energy into high-energy photons.
Our simulations show that a substantial fraction of the incident laser
energy can be converted into gamma-ray radiation under optimized
conditions. The resulting photon spectra depend sensitively on key
plasma and laser parameters, including plasma density, magnetic field
strength, and laser intensity, indicating that the emission
characteristics can be tuned in a controllable manner.
The mechanism explored here is closely related to resonant wave–particle
interactions in extreme astrophysical environments, where relativistic
particles interact with intense electromagnetic and Alfvénic
fluctuations. Relativistic two-wave resonance thus provides a
laboratory-accessible analogue of these high-energy processes.
These results establish relativistic two-wave resonance as a robust and
controllable pathway for laser-driven gamma-ray generation, bridging
laboratory high-energy-density plasma physics and astrophysical
gamma-ray emission mechanisms, and opening new prospects for compact,
high-brilliance gamma-ray sources.