Design study of an HHG-seeded harmonic cascade free-electron laser

D J Dunning, N R Thompson, B W J McNeil

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The UK New Light Source (NLS) project identified a strong scientific case for a next-generation light source to deliver continuous coverage of the photon energy range 50–1000 eV with variable polarisation, 20 fs pulse widths, a high degree of temporal coherence and 1 kHz repetition rate. Three separate seeded free-electron lasers (FELs) were proposed which in combination satisfy these requirements. It was proposed to use a high harmonic generation (HHG) seed source tuneable from 50–100 eV to give direct seeding at the fundamental FEL photon energy up to 100 eV, with one or two stages of harmonic up-conversion within the FEL to reach the higher photon energies. This paper focuses on the optimisation of a two-stage harmonic cascade FEL design operating at the highest (fundamental) photon energy of 1000 eV. Topics investigated include the configuration of the modulator undulators, the required seed power and the effects of the temporal structure of the unfiltered HHG seed on the FEL output. FEL simulations using realistic electron beam distributions tracked from the gun to the FEL are presented, illustrating the predicted coherence properties of the FEL output.
Original languageEnglish
Pages (from-to)1362-1373
Number of pages12
JournalJournal of Modern Optics
Volume58
Issue number16
Early online date9 Jun 2011
DOIs
Publication statusPublished - 9 Jun 2011

Fingerprint

free electron lasers
harmonic generations
cascades
harmonics
seeds
photons
laser outputs
light sources
energy
inoculation
modulators
repetition
pulse duration
electron beams
requirements
optimization
polarization
configurations

Keywords

  • free-electron laser
  • HHG
  • filtering
  • new light source
  • harmonic cascade

Cite this

Dunning, D J ; Thompson, N R ; McNeil, B W J. / Design study of an HHG-seeded harmonic cascade free-electron laser. In: Journal of Modern Optics. 2011 ; Vol. 58, No. 16. pp. 1362-1373.
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Design study of an HHG-seeded harmonic cascade free-electron laser. / Dunning, D J; Thompson, N R; McNeil, B W J.

In: Journal of Modern Optics, Vol. 58, No. 16, 09.06.2011, p. 1362-1373.

Research output: Contribution to journalArticle

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