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TY - UNPB AU - Feng, C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Slippage Boosted Spectral Cleaning in a Seeded Free-Electron Laser J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The realization of fully coherent X-ray radiation pulse has been a long-standing challenge for free-electron lasers. A promising way for producing stable transform-limited pulses is based on the harmonic up-conversion techniques with a conventional laser as the seed. However, it is found that the insignificant phase error in the seed laser will be eventually multiplied by the harmonic number, leading to a degradation of the output temporal coherence at short wavelength. Here, we report the demonstration of a slippage boosted spectral cleaning technique to mitigate the impact of seed laser induced phase errors and to improve the temporal coherence of a seeded FEL. Experimental results show that fully coherent radiation pulses can be generated in a seeded FEL with the help of the proposed technique. PB - JACoW Publishing CP - Geneva, Switzerland ER -