Pilot Experiments and New Developments at the DELTA Short-Pulse Facility

Khan, S., Büsing, B., Götz, F., Jebramcik, M., Lockmann, N. M., Mai, C., Auf der Heide, A. Meyer, Niemczyk, R., Riemann, B., Shayeganrad, G., Suski, M., Ungelenk, P., Zimmermann, D., Plötzing, M., Döring, S., Gehlmann, M., Cramm, S., Plucinski, L., Schneider, C. M., Xiao, S., Eschenlohr, Andrea, Ligges, Manuel and Bovensiepen, U. (2017) Pilot Experiments and New Developments at the DELTA Short-Pulse Facility. In IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference. Joint Accelerator Conferences Website. pp. 2578-2581 .

Abstract

At the 1.5-GeV synchrotron light source DELTA operated by the TU Dortmund University, ultrashort radiation pulses in the vacuum ultraviolet (VUV) and terahertz (THz) regime are routinely generated by the interaction of electron bunches with femtosecond laser pulses. A laser-induced energy modulation is converted into a density modulation (microbunching) by a magnetic chicane, leading to coherent emission at harmonics of the initial laser wavelength (coherent harmonic generation, CHG). Path length differences of the energy-modulated electrons along the magnetic lattice lead to a dip in the longitudinal charge distribution, which gives rise to the coherent emission of THz radiation. In first pump-probe photoemission experiments, the spatial and temporal overlap of laser pump and CHG probe pulse on the sample was demonstrated. Furthermore, the effect of two temporally separated seed pulses was studied in the VUV and (sub-)THz regime.

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Contributors

Author: G. Shayeganrad

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