| 摘要 |
PURPOSE:To readily obtain ultrashort pulse X-ray or high-frequency X-ray pulses by having such construction that photoelectrons generated through the process of applying ultraviolet rays to a photoelectric film, an electron- multiplying element or the like are accelerated to be struck against a metal target so as to generate X-rays. CONSTITUTION:An electron multiplying element (MCP) 4 is arranged in a vacuum vessel 1. A photoelectric film (a photocathode) 3 in opposition to the electron-multiplying element 4 is provided to a wall body at the frontal part of the vacuum vessel 1. When output light from an ultraviolet ray source 2 is first applied to the photoelectric film 3 via a lens 8, the photoelectric film may have its photoelectric effect to generate photoelectrons. The generated photoelectrons are respectively directed to the electron-multiplying element 4 to be amplified here by a potential difference resulting from a power source 5. The amplified photoelectrons are respectively accelerated to form the corresponding focused electron beams so as to be struck against a target T by both an electric field formed by a power source 7 and an electron lens l. Thus X-rays are generated in a radial form, and they are applied through a window 1a to the outside of the vacuum vessel 1. |
