Results from the optical replica experiment at Flash
2008 (English)In: 30th International Free Electron laser Conference in Gyeongju, Agust 24-29, 2008, 2008Conference paper (Other scientific)
Experimental results from the optical replica synthesizer (ORS) at FLASH (DESY, Hamburg) are presented.The ORS is a novel method to determine the longitudinal structure of sub-ps electron bunches by creating a coherent optical pulse at 775 nm wavelength that has th same shape as the electron bunch and can be analyzed using a FROG (frequency-resolved optical gating) device. The ORS hardware was installed in 2007, comprising a Ti:Sapphire laser system, two undulators and optical equipment. During first experimetns, the spatial and temporal overlap of an uncompressed electron bunch and a 200 fs laser pulse in an undulator was achieved, modulating the electron energy and density. Coherent transition radiation from micro-bunched electrosn was observed varying the timing between electrons and laser pulse and producing two-dimensional images of slices within the electron bunch. In a second experiment, alser pulses were overlapped with compressed electron bunches in the undulator and coherent radiation from a second undulator was observed and analyzed using the FROG device.
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IdentifiersURN: urn:nbn:se:uu:diva-17765OAI: oai:DiVA.org:uu-17765DiVA: diva2:45536