Speaker
Description
Echo-enabled harmonic generation (EEHG) has been proposed as a seeding method for free-electron lasers but can also be employed to generate ultrashort radiation pulses at electron storage rings. With the interaction of electrons with femtosecond laser pulses in two undulators (”modulators”), each followed by a magnetic chicane, a longitudinal phase space structure with high harmonic content is produced, which gives rise to coherent emission of radiation at harmonics of the laser wavelength. The duration of the coherently emitted pulses in a third undulator (”radiator”) is given by the laser pulse durations. Thus, EEHG pulses can be three orders of magnitude shorter but still more intense than conventional synchrotron light pulses. After reviewing proposals of EEHG at different storage rings, the latest results of a first demonstration experiment at the 1.5-GeV synchrotron light source DELTA at TU Dortmund University are presented.
Funding Agency
Work supported by DFG (contract INST212/236-1), BMFTR (contracts 05K22PE1, 05K22PE4) and by the Federal State NRW
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