Clarke, J. A.

Paper	Title	Page
MOPPH067	Issues in High Harmonic Seeding of the 4GLS XUV-FEL	198
	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
	Using High Harmonics (HH) as a seed for free electron lasers is currently under consideration in a number of proposed facilities. An HH seed source is independent of machine dynamics, and allows for extensive manipulation of the seed pulse using well-established techniques of ultrafast laser physics. These allow for rapid tuning, and may enable the extension of chirped pulse amplification and even pulse shaping for coherent control to short wavelengths. In addition, there are advantages in terms of noise and synchronization. There are a number of issues involved in the implementation of HH seeding: energy, tunability, coherence, temporal structure, etc. We discuss these issues and their application in the 4GLS XUV-FEL
TUAAU02	Future Light Sources: Integration of Lasers, FELs and Accelerators at 4GLS	257
	J. A. Clarke CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
	4GLS is a novel next generation proposal for a UK national light source to be sited at Daresbury Laboratory, based on a superconducting energy recovery linac (ERL) with both high average current photon sources (undulators and bending magnets) and three high peak current free electron lasers. Key features are a high gain, seeded FEL amplifier to generate XUV radiation and the prospect of advanced research arising from unique combinations of sources with femtosecond pulse structure. The conceptual design is now completed and a CDR recently published. The 4GLS concept will be summarised, highlighting how the significant design challenges have been addressed, and the project status and plans explained.
	Slides
	Talk
TUPPH057	First Tolerance Studies for the 4GLS FEL Sources	462
	D. J. Dunning, J. A. Clarke, D. J. Scott, N. Thompson CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire B. W.J. McNeil USTRAT/SUPA, Glasgow
	The Conceptual Design Report for the 4th Generation Light Source (4GLS) at Daresbury Laboratory in the UK was published in Spring 2006. 4GLS features three distinct FEL designs, each operating in a different wavelength range: an externally seeded amplifier operating in the photon energy range 8-100eV (XUV-FEL); a low-Q cavity (regenerative amplifier) FEL operating over 3-10eV (VUV-FEL); a high-Q cavity FEL operating from 2.5-200μm (IR-FEL). Preliminary results of tolerance studies for the FELs designs are presented. In particular, the effects of the relative timing offset between the seed pulse of the XUV-FEL and the electron bunch, as well as the effects of electron bunch timing jitter in the VUV-FEL, are presented.