Electron-photon interactions in high energy beam production and cooling
Abstract
In this review we consider three important applications of lasers in high energy physics: gamma gamma, gamma electron colliders, laser cooling, positron production. These topics are actual now due to plans of construction linear e+e-, e-e-, gamma-gamma, gamma-e colliders with energies 0.3--1 TeV. High energy photons for gamma-gamma, gamma-e collisions can be obtained using laser backscattering. These types of collisions considerably increase physics potential of linear colliders. Very low emittance of electron beams required for achieving ultimate gamma-gamma luminosity can be obtained using a laser cooling of electron beams. Combining a laser-electron Compton scattering with subsequent conversion of these photons to e+e- pairs on the target (it can be a laser target) one can get a nice source of polarized positron. In this paper, we briefly consider these subjects with emphasis on underlying physics of photon-electron interactions.
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