Probability of radiation of twisted photons by axially symmetric bunches of particles

  • O. V. BogdanovEmail author
  • P. O. Kazinski
Regular Article


In most cases, the twisted photons generated directly by charged particles in undulators and laser waves are produced by bunches of particles and not by one charged particle. However, up to now, the theoretical studies of such a radiation were mainly based on description of radiation produced by one charged particle. In the present paper, we investigate the effect of a finite width of a particle bunch on radiation of twisted photons. The general formulas connecting the radiation probability distribution of twisted photons produced by bunches of identical particles with the radiation probability distribution of twisted photons generated by one particle are obtained for axially symmetric bunches. The bunch is called axially symmetric if it is axially symmetric with respect to the detector axis at some instant of time and all the particles in the bunch move along parallel trajectories. The general sum rules for the probability of radiation of twisted photons by axially symmetric bunches are established. In particular, we prove that the projection of the average total angular momentum of radiated twisted photons per particle in the bunch does not depend on the radial profile of the bunch. The uniform, Gaussian, and exponential radial bunch profiles are considered in detail. The radiation of axially symmetric bunches in ordinary and crystalline undulators is investigated. The selection rules for radiation of twisted photons by one particle in undulators are violated when the finite width of the particle bunch is taken into account. We find the condition when this violation is marginal. The form of the radiation probability distribution of twisted photons becomes universal for wide incoherent axially symmetric particle bunches. We completely describe these universal distributions.


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© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Physics FacultyTomsk State UniversityTomskRussia
  2. 2.Division for Mathematics and Computer SciencesTomsk Polytechnic UniversityTomskRussia

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