"Diffraction-free" optical beams in inverse free electron laser accelerators

S. Y. Cai, A. Bhattacharjee, T. C. Marshall

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

"Diffraction-free" optical beams correspond to exact solutions of the wave equation in free space with the remarkable property that they propagate with negligible transverse spreading for distances much larger than the Rayleigh range. The requirement for this to occur is a large aperture. Using a 2D computer code, we find that these optical beams will also propagate with negligible diffraction even when perturbed by the electron beam in an IFEL; indeed they match well the FEL requirement for the accelerator. The numerical simulations are performed for the proposed facility at Brookhaven in which λs = 10 μm, B = 1.5 T (linearly tapered lw = 1.31-6.28 cm) and the optical beam power is either 8 × 1011 W or 2.3 × 1010 W. Approximately 70% of the electrons constituting a beam of current 5 mA or 15 A, radius 0.14 mm and initial energy of 50 MeV is accelerated at 50 MeV/m.

Original languageEnglish (US)
Pages (from-to)481-484
Number of pages4
JournalNuclear Inst. and Methods in Physics Research, A
Volume272
Issue number1-2
DOIs
StatePublished - Oct 1988
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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