Speaker
Description
First SASE lasing at DESY's FLASH Free-electron laser (FEL) - that time called as TESLA Test Facility FEL - was in February 2000. It was the first FEL worldwide producing SASE radiation at VUV wavelengths. Since then, over more than two decades, FLASH has provided high peak and average brilliance XUV and soft X-ray FEL radiation for photon science experiments.
In order to operate FLASH as a state-of-the-art FEL, it has been continuously refurbished and upgraded. The most recent upgrade FLASH2020+ increased the electron beam energy of the superconducting linac to 1.35 GeV and reconstructed the FLASH1 undulator beamline. The new external seeded FLASH1 will provide fully coherent radiation at up to MHz bunch repetition rate (burst). Moreover, thanks to the new APPLE-III type undulators, a full polarization control is possible. As before, FLASH1 hosts also a THz source. FLASH2 continues in SASE operation.
This paper provides an overview of FLASH's evolution from a test facility for superconducting accelerator technology to a trailblazing and innovative FEL user facility, very successfully operated for the photon science community.
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