The equivalent photon approximation for coherent processes at colliders
R. Engel, A. Schiller, V. G. Serbo
Abstract
We consider coherent electromagnetic processes for colliders with short bunches, in particular the coherent bremsstrahlung (CBS). CBS is the radiation of one bunch particles in the collective field of the oncoming bunch. It can be a potential tool for optimizing collisions and for measuring beam parameters. A new simple and transparent method to calculate CBS is presented based on the equivalent photon approximation for this collective field. The results are applied to the ϕ--factory DAΦNE. For this collider about 5 · 1014 d Eγ/ Eγ photons per second are expected in the photon energy Eγ range from the visible light up to 25 eV.
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