We have demonstrated the principle of operation and the application of a new type of high repetition rate X-ray source. Most probably the conversion efficiency can be improved by optimization of the laser pulse and target irradiation conditions. Moreover other target materials will provide a broad spectral range of x-ray emission, either from plasma continuum emission, or from the characteristic K_α and K_β emission lines. These sources are also very attractive for dynamic EXASF studies of chemical bonds changes. Recently we also demonstrated the generation of X-ray continuum up to 5 keV using 10 W, 10 kHz repetition rate regenerative amplifier.
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