Abstract

To develop the possibilities of resonant transition radiation (RTR) as an intense quasi-monochromatic X-ray source, we have measured energy spectra and angular distributions of the RTR X rays emitted from Kapton- and silicon-foil stacks by varying the number of foils, foil thickness, and spacing between adjacent foils. The intensity of RTR X rays increases nonlinearly with the number of foils in case of 12.5-μm thick Kapton- and silicon-foil stacks. The energy of the RTR X rays can be tuned by changing only the thickness of the foil and will be defined well when the X rays are sliced at a fixed emission angle. The obtained brilliance of 1.4×1012 photons/(s⋅mrad2⋅mm2⋅0.1%b.w.⋅mA) for the peak energy of 6.7-keV X rays is comparable to those of synchrotron radiation (SR) emitted by using bending magnets in GeV-electron facilities.

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