Abstract
An improved theoretical model to calculate the focal spot properties of coherent synchrotron radiation (SR) soft X-ray beams by combining and aligning two microchannel plates (MCPs) is presented. The diffraction patterns of the radiation behind the MCP system are simulated in the framework of the electrodynamical model of the radiation emission from two-dimensional finite antenna arrays. Simulations show that this particular optical device focuses the soft X-ray radiation in a circular central spot with a radius of ∼4 µm. The study points out that such MCP-based devices may achieve micrometre and sub-micrometre spot sizes as required by many applications in the soft X-ray range. Finally, based on experimental and theoretical results of the radiation transmission by this MCP-based device, a new method to characterize the spatial properties of brilliant SR sources is discussed.
Highlights
Third-generation synchrotron radiation facilities and freeelectron lasers (FELs) are brilliant sources of coherent X-rays open to a interdisciplinary scientific community that allow many new experiments to be performed
Based on experimental and theoretical results of the radiation transmission by this microchannel plates (MCPs)-based device, a new method to characterize the spatial properties of brilliant synchrotron radiation (SR) sources is discussed
In addition to undulator devices installed at third-generation synchrotron radiation (SR) facilities, FELs are unique radiation sources that deliver narrow-band coherent radiation beams
Summary
Third-generation synchrotron radiation facilities and freeelectron lasers (FELs) are brilliant sources of coherent X-rays open to a interdisciplinary scientific community that allow many new experiments to be performed. The main characteristics of polycapillary spectroscopic devices are size and divergence of the transmitted beam The radiation propagation through MCPs is typically described within classical (ray) optics as multiple reflections from their channel’s internal walls This approach, neglects the wave nature of the radiation and, in particular, the phase evolution of the propagating wave. The approach allows interference and focusing of X-ray beams behind different multichannel MCP configurations
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