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TY - CONF AU - Wang, P. AU - Chou, M.C. AU - Hwang, J.-Y. AU - Lau, W.K. AU - Lee, A.P. AU - Lee, C.T. AU - Leou, K.C. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Generation of Tunable Femtosecond X-Rays from High-Period-Number Resonant Transition Radiation Emitters J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - Femtosecond resonant transition radiation (RTR) in x-ray region can be generated from alternatively stacked multilayer structures when they are driven by relativistic ultrashort electron beams. These structures can be fabricated by coating layer pairs of high and low density materials. By increasing the number of these layer pairs, narrow-band x-ray can be generated. In this report, we present our efforts on the development of a 12 keV femtosecond narrow-band x-ray source by driving high-period-number RTR emitters with the NSRRC photoinjector linac system. Radiation wavelength is tunable by varying the incident angle of the beam. A few tens MeV, ultrashort beam has been available from the photoinjector system via velocity bunching in the rf linac. A 100-period (200 layers) Mo/Si multi-layer emitters with thin substrate have been fabricated. For a 100 pC drive beam, the expected photon yield from such emitter is about 4x104. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4339 EP - 4341 KW - radiation KW - electron KW - linac KW - photon KW - bunching DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPMK019 UR - http://jacow.org/ipac2018/papers/thpmk019.pdf ER -