Beam compression in wide-angle incident x-ray waveguides and resonance in multiplate x-ray cavities

• Main Authors: Po-Wei Wu, 武柏瑋
• Other Authors: Shih-Lin Chang
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/09704881581098912252

碩士 === 國立清華大學 === 物理學系 === 94 === This thesis dealt with two research topics, one relating to x-ray waveguides, the other to multiplate x-ray cavities. For the former a given incident x-ray beam is usually coupled into a waveguide from the side or from the front at grazing or normal incidence condition. In contrast, here we propose to use surface diffraction beam of (1 1 3) reflection to guide x-rays in a wide angle incidence geometry. Waveguides of 150 μm in height, 2 cm in length and the width ranging from 5 to 100 μm were prepared from a 4-inch Si(001) crystal wafer by using the microelectronic lithography process, then plated with gold by thermal evaporation.Much more beams were collected in the waveguide because of total reflection. Second part is concerned with simulation of resonance in multiplate x-ray cavities. We have experimentally observed cavity resonance fringes in the Fabry-Perot resonators for hard x-rays, but at the same time try to simulate energy scans of cavities with different numbers of plates according to the x-ray dynamical theory, while energy spread of the incident beam is notionally gaussian distribution. We attempted to find out the meaning of Fourier transform, comparison between different numbers of plates, and effects on changing gap width of multiplate cavities.