P. CASTRO (DESY)
The radiation characteristics of Free Electron Lasers (FEL) based on the Self-Amplified Spontaneous Emission (SASE) principle are very high brilliance and full transverse coherence. These properties, together with the possibility to tune it to low wavelengths, make of SASE FELs a unique synchrotron radiation source type. Linac driven SASE FELs require high peak current electron pulses with very small transverse emittance. Photocathode RF guns and bunch compressors are indispensable linac components in order to achieve the high beam quality required. A very precise long magnetic undulator structure is also mandatory to provide the interaction between the photon field and the electron bunch. Other aspects of great importance for the achievement of SASE are beam orbit correction techniques and stability. After a short introduction of the SASE principle and beam requirements, recent results of SASE experiments world wide will be given, focusing on the TESLA Test Facility results around 100 nm.
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