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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Beschleunigerphysik XIII (Synchrotronstrahlung/THz)

HK 72.9: Vortrag

Donnerstag, 7. März 2013, 16:00–16:15, WIL-C207

sFLASH: Seeding at 38nm — •Christoph Lechner — University of Hamburg, Hamburg, Germany

Many free-electron lasers (FEL) producing light in the UV and extreme ultraviolet (XUV) wavelength ranges start up from noise, operating in the self-amplified spontaneous emission (SASE) mode and therefore have poor longitudinal coherence. It has recently been demonstrated that using so-called 'seeding' techniques, it is possible to generate almost fully coherent photon pulses.

The sFLASH experiment at DESY has been built to study seeding using a source based on a high-harmonic generation (HHG) process. In contrast to SASE, the seeded FEL is operated as an amplifier of the HHG seed. Critical for successful seeding is the precise 6D overlap between the electron bunch and the HHG radiation in the undulator. As a result, one expects greatly improved longitudinal coherence and higher shot-to-shot stability of the pulse spectra and energy. In addition, the output of the seeded FEL is intrinsically synchronized to the HHG drive laser, thus enabling pump-probe experiments with a resolution in the order of 10 fs. In this contribution, the sFLASH layout as well as recent experimental results are presented.