Echo-enabled Harmonic Generation Free Electron Laser

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In this paper, we systematically study the echo-enabled harmonic generation (EEHG) free electron laser (FEL). The EEHG FEL uses two modulators in combination with two dispersion sections that allow to generate in the beam a high harmonic density modulation starting with a relatively small initial energy modulation of the beam. After presenting analytical theory of the phenomenon, we address several practically important issues, such as the effect of incoherent synchrotron radiation in the dispersion sections, and the beam transverse size effect in the modulator. Using a representative realistic set of beam parameters, we show how the EEHG scheme enhances the ... continued below

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21 pages

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Xiang, D. & Stupakov, G. December 18, 2008.

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Description

In this paper, we systematically study the echo-enabled harmonic generation (EEHG) free electron laser (FEL). The EEHG FEL uses two modulators in combination with two dispersion sections that allow to generate in the beam a high harmonic density modulation starting with a relatively small initial energy modulation of the beam. After presenting analytical theory of the phenomenon, we address several practically important issues, such as the effect of incoherent synchrotron radiation in the dispersion sections, and the beam transverse size effect in the modulator. Using a representative realistic set of beam parameters, we show how the EEHG scheme enhances the FEL performance and allows to generate a fully (both longitudinally and transversely) coherent radiation. As an example, we demonstrate that 5 nm coherent soft x-rays with GW peak power can be generated directly from the 240 nm seeding laser using the proposed EEHG scheme.

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21 pages

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  • Journal Name: Physical Review Special Topics - Accelerators and Beams

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  • Report No.: SLAC-PUB-13474
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevSTAB.11.024001 | External Link
  • Office of Scientific & Technical Information Report Number: 944556
  • Archival Resource Key: ark:/67531/metadc898357

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Office of Scientific & Technical Information Technical Reports

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  • December 18, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 26, 2017, 3:40 p.m.

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Xiang, D. & Stupakov, G. Echo-enabled Harmonic Generation Free Electron Laser, article, December 18, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc898357/: accessed August 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.