Polarized γ-photon beams produced by collision of two ultrarelativistic electron beams
arxiv(2024)
摘要
Many studies have shown that high-energy γ-photon beams can be
efficiently generated via nonlinear Compton scattering driven by laser pulses
with intensities > 10^22W/cm^2 recently available in laboratories.
Here, we propose a laserless scheme to efficiently generate high-energy
polarized γ-photon beams by collision of two ultrarelativistic electron
beams. The self-generated field of a dense driving electron beam provides the
strong deflection field for the other ultrarelativistic seeding electron beam.
A QED Monte Carlo code based on the locally constant field approximation is
employed to simulate the collision process, and the polarization properties of
produced γ photons are investigated. The simulation results and
theoretical analysis indicate that the photon polarization, including both
linear and circular polarizations, can be tuned by changing the initial
polarization of the seeding beam. If an unpolarized seeding beam is used,
linearly polarized photons with an average polarization of 55% can be
obtained. If the seeding beam is transversely (longitudinally) polarized, the
linear (circular) polarization of photons above 3 GeV can reach 90% (67%),
which is favorable for highly polarized, high-energy γ photon sources.
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