PRODUCTION OF HIGH-BRILLIANT COHERENT X-RAYS BY THE MULTIPLE INTERFERENCE OF TRANSITION RADIATION

present research program is to establish a compact monochromatic high brilliant X-rayproduction method. For the pose，我们已经studied the properties of resonant transition radiation (RTR) which is emitted when arelativistic charged particle crosses periodical boundaries of two different dielectric media. Thefollowing results are obtained:(1)我们系统地measured energy spectra and emmision-angleX rays produced from Kapton- and single crystalline silicon-foils stacks at electron130 MeV和1gev . the experimental results agree with ones calculated including X-rayabsorption by the foils in an X-ray energy region of 2 to 20 keV.(2)这是关于关于的fact that the RTR source can produce monoenergetic X rays with a brilliance of the order of 10（s·mrad^ 0.1%b.w.·mA） in the energy range from several to tens keV.(3) X rays produced from thesource has discrete energy spectra and their energies can be tuned easy by changing the thicknessand spacing of the foil-stacks. Therefore，我们可以提供RTR X ray directly from the source without using an X-ray monochrometor. themonochrometor is generally poor in the反射效果X-rays and easily damaged especiallyby soft X rays. The RTR X-ray source is specially effective for The pulse mode operation of a widthof ps to fs，because a peak current of electrons can be increased keeping an average beam current to a低价值可以容忍for the foil stack.The RTR X-ray sources will be applied in various研究fields such as lithography， EXAFS,fluorescence X-ray analysis, angiography，because of the expected specifications of a brilliance of the order of 10^<12> photons/mm^2，a size of the beam of 1mm in diameter and an energy resolution of 1%。

The aim of the present research program is to establish a compact monochromatic high brilliant X-ray production method. For the purpose, we have studied the properties of resonant transition radiation (RTR) which is emitted when a relativistic charged particle crosses periodical boundaries of two different dielectric media. The following results are obtained :(1) We systematically measured energy spectra and emmision-angle dependence of X rays produced from Kapton- and single crystalline silicon-foils stacks at electron energies of 130 MeV and 1 GeV.The experimental results agree with ones calculated including X-ray absorption by the foils in an X-ray energy region of 2 to 20 keV.(2) It is concluded from the above fact that the RTR source can produce monoenergetic X rays with a brilliance of the order of 10^<12>/ (s・mrad^2・0.1%b.w.・mA) in the energy range from several to tens keV.(3) X rays produced from the source has discrete energy spectra and their energies can be tuned easily by changing the thickness and spacing of the foil-stacks. Therefore, we can supply RTR X rays directly from the source without using an X-ray monochrometor. The monochrometor is generally poor in the reflection efficiency of X-rays and easily damaged especially by soft X rays. The RTR X-ray source is specially effective for the pulse mode operation of a width of ps to fs, because a peak current of electrons can be increased keeping an average beam current to a low value which can be tolerable for the foil stack.The RTR X-ray sources will be applied in various research fields such as lithography, EXAFS,fluorescence X-ray analysis, angiography, because of the expected specifications of a brilliance of the order of 10^<12> photons/mm^2, a size of the beam of 1mm in diameter and an energy resolution of 1%.