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TY - CONF AU - Khan, S. AU - Bahnsen, F.H. AU - Bolsinger, M. AU - Götz, F. AU - Hilbrich, S. AU - Jebramcik, M.A. AU - Lockmann, N.M. AU - Mai, C. AU - Meyer auf der Heide, A. AU - Niemczyk, R. AU - Shayeganrad, G. AU - Ungelenk, P. AU - Zimmermann, D. ED - Schaa, Volker RW ED - Petit-Jean-Genaz, Christine ED - Ko, In Soo ED - Kim, Dong Eon ED - Kim, Kyung Sook TI - Spectral Studies of Ultrashort and Coherent Radiation Pulses at the DELTA Storage Ring J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - At the 1.5-GeV synchrotron light source DELTA operated by the TU Dortmund University, ultrashort and coherent radiation pulses in the VUV and THz regime are routinely generated by the interaction of electron bunches with 45-fs laser pulses. A laser-induced modulation of the electron energy is converted into a density modulation (microbunching) by a magnetic chicane, giving rise to coherent emission at harmonics of the initial laser wavelength (coherent harmonic generation, CHG). As a first step towards active control of the shape and spectrum of CHG pulses, spectral studies were performed under variation of the chicane strength and the laser properties. The spectral phase of the laser pulses was controlled by tuning the compressor of the laser amplifier and was monitored using FROG (frequency-resolved optical gating). In this paper, monochromator scans as well as single-shot spectrograms of the CHG radiation are presented and compared to simulations of the laser-electron interaction and microbunching process. In addition, other results from the short-pulse facility as well as a future upgrade employing the echo-enabled harmonic generation (EEHG) scheme will be outlined. PB - JACoW CP - Geneva, Switzerland SP - 2851 EP - 2854 KW - laser KW - radiation KW - electron KW - undulator KW - bunching DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-WEPOW014 UR - http://jacow.org/ipac2016/papers/wepow014.pdf ER -