Generation of Resonant Transition Radiation as an Femto-second Hard X-ray Source
王璞1*, 李昭德3, 李安平2, 周明昌2, 黃景一2, 柳克強1, 劉偉強2
1Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan
2National Synchrotron Radiation Research Center, Hsinchu, Taiwan
3Instrument Technology Research Center, Hsinchu, Taiwan
* Presenter:王璞,
Femtosecond resonant transition radiation (RTR) in x-ray region can be generated from alternatingly stacked multilayer structures when they are driven by relativistic ultrashort electron beams. In contrast to large-scale facility like x-ray free electron lasers (XFELs), compact x-ray sources of moderate peak brightness can be developed by using this method for some ultrafast scientific research. These structures can be fabricated by coating layer pairs of high and low density materials. Narrow-bandwidth x-rays can be generated by increasing the number of periods (i.e. the number of layer pairs). Thanks to the high transmittance of hard x-ray in most materials, the radiation bandwidth is not limited by x-ray absorption up to dozens or even hundreds of layers. In this report, we present our efforts on the development of a femtosecond narrow-band 12 keV x-ray source by driving high-period-number RTR emitters with the NSRRC photoinjector linac system which is operating in short bunch mode.

Keywords: accelerator, transition radiation, x-ray source