Polarization characteristics of radiation in both ‘light’ and conventional undulators

A. P. Potylitsyn, A. M. Kolchuzhkin, S. A. Strokov

Research output: Contribution to journalArticlepeer-review


As a rule, an intensity spectrum of undulator radiation (UR) is calculated by using the classical approach, even for electron energy higher than 10 GeV. Such a spectrum is determined by an electron trajectory in an undulator while neglecting radiation loss. Using Planck's law, the UR photon spectrum can be calculated from the obtained intensity spectrum, for both linear and nonlinear regimes. The electron radiation process in a field of strong electromagnetic waves is considered within the quantum electrodynamics framework, using the Compton scattering process or radiation in a ‘light’ undulator. A comparison was made of the results from using these two approaches, for UR spectra generated by 250-GeV electrons in an undulator with a 11.5-mm period; this comparison shows that they coincide with high accuracy. The characteristics of the collimated UR beam (i.e. spectrum and circular polarization) were simulated while taking into account the discrete process of photon emission along an electron trajectory in both undulator types. Both spectral photon distributions and polarization dependence on photon energy are ‘smoothed’, in comparison to that expected for a long undulator—the latter of which considers the ILC positron source (ILC Technical Design Report).

Original languageEnglish
Pages (from-to)380-383
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Publication statusPublished - 1 Jul 2017


  • ILC
  • Positron source
  • Quantum approach
  • Undulator radiation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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