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On the Importance of Electron Beam Brightness in High Gain Free Electron Lasers

Elettra–Sincrotrone Trieste S.C.p.A., S.S. 14 km 163,5 in Area Science Park, 34149 Basovizza, Trieste, Italy
Photonics 2015, 2(2), 317-341;
Received: 4 March 2015 / Revised: 23 March 2015 / Accepted: 24 March 2015 / Published: 27 March 2015
(This article belongs to the Special Issue Extreme UV Lasers: Technologies and Applications)
Linear accelerators delivering high brightness electron beams are essential for driving short wavelength, high gain free-electron lasers (FELs). The FEL radiation output efficiency is often parametrized through the power gain length that relates FEL performance to electron beam quality at the undulator. In this review article we illustrate some approaches to the preliminary design of FEL linac-drivers, and analyze the relationship between the output FEL wavelength, exponential gain length and electron beam brightness. We extend the discussion to include FEL three-dimensional effects and electron beam projected emittances. Although mostly concentrating on FELs based upon self-amplified spontaneous emission (SASE), our findings are in some cases highly relevant to externally seeded FELs. View Full-Text
Keywords: free electron laser; gain length; electron beam brightness free electron laser; gain length; electron beam brightness
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Di Mitri, S. On the Importance of Electron Beam Brightness in High Gain Free Electron Lasers. Photonics 2015, 2, 317-341.

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