Abstract
We consider a new type of radiation at colliders with short bunches — coherent bremsstrahlung (CBS). CBS can be treated as radiation of the first bunch particles caused by the collective electromagnetic field of the short second bunch. A general method for the calculation of this CBS is presented. The number of CBS photons per single collision is d N γ ≈ N 0 dE γ / E γ in the energy range E γ<E c=4γ 1 2 h ̵ c/l . Here γ 1= E 1/ m 1 c 2, l is the length of the second bunch and N 0∝ N 1 N 2 2 where N j is the jth bunch population. For the colliders VEPP-4M, BEPC, CESR, TRISTAN the quantity N 0≈10 8 and E c ≈1–100 keV. Unusual properties of CBS and the possibility of using CBS for measuring the beam parameters are discussed.
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