FEL options for the proposed UK fourth generation light source (4GLS)

Poole, M.W. and McNeil, B.W.J. (2003) FEL options for the proposed UK fourth generation light source (4GLS). Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 507 (1-2). pp. 489-493. ISSN 0168-9002

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Abstract

4GLS is a novel low-energy light source proposed as a complementary facility to the DIAMOND X-ray project for the UK, and could probably replace the present SRS at Daresbury in about 6 years time. This facility will use a combination of three separate FELs, undulators and bending magnets to provide a unique source of high-brightness continuous and pulsed radiation from the IR to XUV (~100 eV). Here, we give a brief description of the proposed FELs in the IR and VUV followed by a pre-design parameter study of the more technically challenging XUV high-gain FEL. The electron beam source for this FEL is a 600MeV superconducting energy recovery linac with peak currents of a few kA, normalised rms emittance ~3 pi mm-mrad and rms energy spread ∼5×10-4. Computer simulations using the 3-D FEL code GENESIS 1.3 are used to investigate a feasible undulator and beam focussing scheme, allowing estimates for achievable radiation power and saturation length to be made.