References (1) NR Thompson and BWJ MCNEIL, Mode-Locking in a Free Electron Laser Amplifier, Phys. Rev. Lett., 100, 203901, 2008 (2) B Sheehy, JA Clarke, NR Thompson, BWJ MCNEIL and A Gordon, Noise and coherence properties of HHG for FEL seeding, Nucl. Instr. Meth. Phys. Res., A593, 21, 2008 (3) DJ Dunning, BWJ MCNEIL and NR Thompson, Short wavelength regenerative amplifier free electron lasers, Nucl. Instr. Meth. Phys. Res., A593, 116, 2008 (4) BWJ MCNEIL, NR Thompson, DJ Dunning and B Sheehy, High harmonic attosecond pulse train amplification in a free electron laser, J. Phys. B: At. Mol. Opt. Phys. 44, 065404, 2011 (5) DJ Dunning, NR Thompson and BWJ MCNEIL, Design study of an HHG-seeded harmonic cascade free-electron laser, Journal of Modern Optics, 58, 1362, 2011 (6) E Kur, DJ Dunning, BWJ MCNEIL, J Wurtele and AA Zholents, A wide bandwidth free-electron laser with mode locking using current modulation, New Journal of Physics, 13, 063012, 2011 (7) DJ Dunning, BWJ MCNEIL, NR Thompson and PH Williams, Start-to-end modelling of a mode-locked optical klystron free electron laser amplifier, Physics of Plasmas 18, 073104, 2011 (8) BWJ MCNEIL and NR Thompson, Cavity resonator free electron lasers as a source of stable attosecond pulses, Europhysics Letters, 96, 54004, 2011 & 98, 29901, 2012 (9) LT Campbell and BWJ MCNEIL, Puffin: A three dimensional, unaveraged free electron laser simulation code, Phys. Plasmas, 19, 093119, 2012 (10) JR Henderson and BWJ MCNEIL, Echo enabled harmonic generation free electron laser in a mode-locked configuration, Europhysics Letters, 100, 64001, 2012 (11) DJ Dunning, BWJ MCNEIL and NR Thompson, Few-Cycle Pulse Generation in an X-Ray Free-Electron Laser, Phys. Rev. Lett., 110, 104801, 2013 (12) BWJ MCNEIL, NR Thompson and DJ Dunning, Transform-Limited X-Ray Pulse Generation from a High Brightness Self-Amplified Spontaneous Emission Free-Electron Laser, Phys. Rev. Lett., 110, 134802, 2013