Abstract
We present the design of a photon-photon collider based on conventional Compton gamma sources for the observation of elastic $\ensuremath{\gamma}\ensuremath{\gamma}$ scattering. Two symmetric electron beams, generated by photocathodes and accelerated in linacs, produce two primary gamma rays through Compton backscattering with two high energy lasers. The elastic photon-photon scattering is analyzed by start-to-end simulations from the photocathodes to the detector. A new Monte Carlo code has been developed ad hoc for the counting of the QED events. Realistic numbers of the secondary gamma yield, obtained by using the parameters of existing or approved Compton devices, a discussion of the feasibility of the experiment and of the nature of the background are presented.
Highlights
Two symmetric electron beams, generated by photocathodes and accelerated in linacs, produce two primary gamma rays through Compton backscattering with two high energy lasers
The scattering of light by light, a phenomenon which is precluded in classical electrodynamics in vacuo, is one of the most elusive effects foreseen by quantum electrodynamics (QED)
The proposed γγ collider is feasible with the present technology and opens the way to new important tests of QED
Summary
The scattering of light by light (γγ → γγ), a phenomenon which is precluded in classical electrodynamics in vacuo, is one of the most elusive effects foreseen by quantum electrodynamics (QED). The unpolarized cross section grows as the sixth power of the center of mass (CM) energy and reaches a peak value of about 1.6 μb at a CM energy around 1.6 MeV. Two symmetric electron beams, generated by photocathodes and accelerated in linacs, produce two primary gamma rays through Compton backscattering with two high energy lasers. The angular distributions show that for energies slightly lower or around the peak, the γγ differential cross section is quite flat, maximizing the emission in the transverse direction
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