Abstract
Helical magnetic wigglers for free electron lasers can produce non-helical electron trajectories if a uniform axial guide magnetic field is imposed. Friedland's necessary criterion for the existence of helical orbits is reviewed and shown to apply for non-relativistic electron energies. An experiment designed to test this criterion is described and results are compared with theory.
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I. B. Bernstein and J. L. Hirshfield, Phys. Rev. A20, 1661 (1979).
See, for example, C. A. Brau, Laser Focus17, 48 (1981).
See, for example, E. D. Shaw and C. K. N. Patel, Workshop on Free-Electron Generators of Coherent Radiation, Telluride, Colorado, Aug. 1979.
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L. Friedland and J. L. Hirshfield, Phys. Rev. Lett.44, 1456 (1980).
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Of course, these considerations also to apply to other applications for wigglers in axial fields, such as in tailoring solid electron beams for gyrotrons.
S. Y. Park, J. M. Baird, R. A. Smith, and J. L. Hirshfield, to be published.
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This research was ponsored by the U.S. Office of Naval Research, and by the U.S.-Israel Binational Science Foundation.
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Avivi, P., Dothan, F., Fruchtman, A. et al. Orbit stability in free electron lasers. Int J Infrared Milli Waves 2, 1071–1080 (1981). https://doi.org/10.1007/BF01006948
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DOI: https://doi.org/10.1007/BF01006948