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TY - UNPB AU - Jing, C.-J. ED - Chin, Yong Ho ED - Zhao, Zhentang ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker RW TI - A Beam-Driven Short Wavelength Undulator for FEL J2 - Proc. of FLS2018, Shanghai, China, 5-9 March 2018 C1 - Shanghai, China T2 - ICFA Advanced Beam Dynamics Workshop T3 - 60 LA - english AB - The idea of the beam-driven accelerators where intense electron beams are used directly to drive electromagnetic fields that accelerate probe or 'witness' electron beams has been known as the wakefield acceleraion for decades. This technology presents significant possibilities to accelerate electron beams in a multiGeV scale in a compact footprint. Here we unveil the next logical step in the application of wakefields, using intense electron beams to create fields that directly guide and periodically deflect 'witness" electrons, causing them to radiate photons. This is a new application of wakefield principles that may be used in the near future to develop compact undulators. The combination of a compact accelerator and a compact undulator could lead to a very compact x-ray free-electron laser in the future. PB - JACoW Publishing CP - Geneva, Switzerland ER -