Speaker
Description
A Free Electron Laser (FEL) with high brightness, ultrafast laser pulses in the vacuum ultraviolet (VUV) wavelength region is an ideal light source for the excitation of valence electrons and the ionization of molecular systems with very high efficiency. It is quite helpful for studies of important dynamic processes in physical, chemical and biological systems. Dalian Coherent Light Source (DCLS) delivers optical beam in the 50-180 nm region in picoseconds or 100 femtoseconds for such research. High gain harmonic generation (HGHG) is the perfect choice in FEL for narrow bandwidth, stable power and low cost due to fewer undulators. After eight months of installation and machine commissioning, a 300-MeV electron beam was achieved with peak current of more than 300A, and the emittance was less than 1.5 mm.mrad. The VUV-FEL power for individual pulse at 133 nm approached more than 200 microJoules with 266 nm seed laser in January, 2017. The gain curve and spectrum of HGHG & SASE FEL was measured, and tapering undulator helps increase the power by almost 100% when the FEL output saturated. The user experiment started in June, 2017. It is open for good proposals from the whole world. In this talk, I will present the commission, main specifications, and the first experiment of Dalian Coherent Light Source.
