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Free keywords:
Physics, Atomic Physics, physics.atom-ph
MPINP:
Research group K. Z. Hatsagortsyan – Division C. H. Keitel
Abstract:
The feasibility of generation of bright ultrashort gamma-ray pulses is
demonstrated in the interaction of a relativistic electron bunch with a
counterpropagating tightly-focused superstrong laser beam in the radiation
dominated regime. The Compton scattering spectra of gamma-radiation are
investigated using a semiclassical description for the electron dynamics in the
laser field and a quantum electrodynamical description for the photon emission.
We demonstrate the feasibility of ultrashort gamma-ray bursts of hundreds of
attoseconds and of dozens of megaelectronvolt photon energies in the
near-backwards direction of the initial electron motion. The tightly focused
laser field structure and radiation reaction are shown to be responsible for
such short gamma-ray bursts which are independent of the durations of the
electron bunch and of the laser pulse. The results are measurable with the
laser technology available in a near-future.
