Abstract
This paper describes a proposal for a compact x-ray source based on parametric x-ray radiation (PXR). The PXR, which is produced when a single crystal is bombarded with relativistic electrons, has good monochromaticity and spatial coherence, and is expected to be well suited for imaging of low-Z materials and medical application. The proposed system employs a pair of copper accelerating structures which are operated at a cryogenic temperature of 20 K and arranged to form a resonant ring configuration. The electron beam is once accelerated up to 75 MeV in one of the structures, being decelerated down to lower than 7 MeV in the other structure after generating PXR at a single crystal, and then dumped. The expected x-ray yield is $1{0}^{9}\text{ }\text{ }\mathrm{photons}/\mathrm{s}$ at a center energy of 15 keV or higher.
Highlights
X-rays have been utilized in a wide range of scientific fields as one of the essential tools for analysis and imaging including medical diagnosis since its discovery in 1895
This paper describes a proposal for a compact x-ray source based on parametric x-ray radiation (PXR)
In this paper we discussed a proposal of a small size (4 m × 8 m) and high intensity PXR source based on a linear accelerator resembling an energy recovery linac, and have presented a complete, workable design of a PXR test facility
Summary
X-rays have been utilized in a wide range of scientific fields as one of the essential tools for analysis and imaging including medical diagnosis since its discovery in 1895. Construction of a SR facility usually requires a large site footprint and high construction cost From these considerations, a compact x-ray source facility producing quasi-monochromatic x-rays with a wide wavelength tunability is desired [4]. Estimation of the PXR generation using single crystals of Si and diamond in terms of the x-ray energy and yield suggests that an average beam power of 1.8 kW is required at an electron energy of 75 MeV. When electrons with this high power are dumped, a large and thick radiation shield must be constructed to ensure radiation safety.
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