超短パルスレーザー駆動X線管を用いた時間分解蛍光X線分光システムの開発 [in Japanese] Development of Time-Resolved X-ray Fluorescence Spectroscopy System using an X-ray Tube Driven by Ultrafast Pulsed Laser [in Japanese]
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A femtosecond-laser-driven X-ray source and an X-ray focusing system have been developed for the time-resolved X-ray fluorescence spectroscopy. The X-ray source, in which a plasma cathode induced by a 10<sup>13</sup>-W/cm<sup>2</sup> laser pulse serves as an electron source of an X-ray tube, provides 10<sup>9</sup> Cu K<sub>α</sub> photons in 4πsr per pulse. The X-ray pulse duration is measured to be about two hundred nanoseconds. Emission analysis of the plasma cathode indicates that the temporal characteristics of the X-ray pulse are determined by the dynamics of the plasma particles under the electrostatic shielding against the applied voltage in the X-ray tube. As for the X-ray focusing system, a focal spot size by a polycapillary lens is measured and the enhancement of X-ray fluorescence intensity due to the lens is demonstrated.
- J. Surf. Sci. Soc. Jpn.
J. Surf. Sci. Soc. Jpn. 29(7), 413-417, 2008-07-10
The Surface Science Society of Japan