2001•University of North Texas Digital Library (University of North Texas)Open access

Tapered undulator for SASE FELs

W.M. Fawley, Zhirong Huang, Kwang-Je Kim, Н.А. Винокуров

Abstract

We discuss the use of tapered undulators to enhance the performance of free-electron lasers (FELs) based upon self-amplified spontaneous emission (SASE), where the radiation tends to have a relatively broad bandwidth, limited temporal phase coherence, and large amplitude fluctuations. Using the polychromatic FEL simulation code GINGER, we numerically demonstrate the effectiveness of a tapered undulator for parameters corresponding to the existing Argonne low-energy undulator test line (LEUTL) FEL. We also study possible tapering options for proposed x-ray FELs such as the Linac Coherent Light Source (LCLS).

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Key concepts: Undulator, Tapering, Physics, Optics, Linear particle accelerator, Spontaneous emission, Coherence (philosophical gambling strategy), Bandwidth (computing)