Dunning, D. J.

Paper	Title	Page
WG333	High Harmonic Seeding and the 4GLS XUV-FEL	36
	B. Sheehy Sheehy Scientific Consulting, Wading River, New York J. A. Clarke, D. J. Dunning, N. Thompson CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire B. W.J. McNeil USTRAT/SUPA, Glasgow
	The Fourth Generation Light Source (4GLS) project, proposed by the CCLRC in the U. K., will include free electron lasers in the XUV, VUV, and IR. It is proposed that the XUV-FEL, operating between 8–100 eV, be seeded by a high harmonic (HH) source, driven by an ultrafast laser system. This offers advantages in longitudinal coherence, synchronization, and the potential for chirped pulse amplification and pulse shaping. In this talk we discuss the issues of HH generation relevant to its use as a seed (energy, spectrum, tunability, synchronization and time structure) and the current planned implementation in the 4GLS XUV-FEL.
	Slides
WG344	The 4GLS VUV-FEL: A Regenerative Amplifier FEL Design
	N. Thompson, D. J. Dunning CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire J. G. Karssenberg, I. Volokhine, P. J.M. van der Slot Twente University, Laser Physics and Non-Linear Optics Group, Enschede B. W.J. McNeil USTRAT/SUPA, Glasgow B. Sheehy Sheehy Scientific Consulting, Wading River, New York
	A VUV-FEL operating over the photon energy range 3–10 eV is a component of the 4th Generation Light Source (4GLS) proposal by Daresbury Laboratory in the United Kingdom. This presentation gives an overview of the design of the 4GLS VUV-FEL, which is based on the concept of the Regenerative Amplifier FEL (RAFEL). A 3D optical propagation code which allows FEL codes such as Genesis 1.3 to be used in combination with full wavefront propagation through cavity elements has been developed at the University of Twente. This code has been used for initial transverse cavity mode analysis of the VUV-FEL and simulation results are presented in this contribution.
	Slides