13th June 2022
Gianluca Geloni, European XFEL, Schenefeld
X-Ray Free Electron Lasers: from Self-Amplified Spontaneous Emission
to Advanced Modes of Operation
In this tutorial I will first review the mechanism of the FEL amplification process in general terms. I will then summarize different modes of operation currently used at X-ray FEL facilities, with special emphasis on Self-Amplified Spontaneous Emission (SASE). While SASE remains the main mode of operation at hard X-ray facilities, during the last years a variety of complementary, advanced FEL techniques were investigated. In the last part of the tutorial I will focus on these special modes of operation, including self-seeding, the production of short pulses and multiple colours
at X-ray FELs, and in particular at the European XFEL.