Production of x-rays by the interaction of charged particle beams with periodic structures and crystalline materials
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We describe our recent experimental study of the production of x-rays by an electron beam interacting with a crystal lattice, i.e. parametric x-ray (PX) generation. In this radiation process the virtual photon field associated with a relativistic electron traveling in a crystal is diffracted by the crystal lattice in the same way that real x-rays are diffracted by crystals. The radiation produced satisfies the Bragg condition associated with the diffraction of the virtual photons which are nearly parallel to the velocity of the electrons. This phenomenon is associated with a more general class of radiation production mechanisms which include transition radiation (TR), diffraction radiation (DR), and Smith-Purcell radiation. In each case, radiation is produced when the particle's fields are altered by interacting with a material whose dielectric constant varies along or near the particle's trajectory. The usual acceleration mechanism for the production of radiation is not involved in these phenomena. In the case of a crystal, the periodic electric susceptibility interacting with the particle's field produces parametric x-rays. We will also present a theoretical overview of this phenomenon which can be used to generate monochromatic, linearly polarized, directional x-rays. Accelerators with energies ranging from a few MeV to hundreds of MeV may be used as drivers for novel parametric x-ray generators for various applications requiring the unique properties of these sources.
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Maruyama, X.K.; DiNova, K.; Snyder, D.; Piestrup, M.A.; Li, Qiang; Fiorito, R.B.; Rule, D.W. (1993);Parametric x-radiation can be described as the diffraction of virtual photons associated with the electric field of a relativistic charged particle passing through a crystal. In analogy with Bragg reflection of x-rays, ...
Modeling and investigation of heavy oxide and alkali-halide scintillators for potential use in neutron and gamma detection systems Cadiente, Jeremy S. (Monterey, California: Naval Postgraduate School, 2015-06);Heavy inorganic oxide and alkali-halide crystals, which previous experimental research has indicated to have fast neutron detection efficiencies well over 40%, were investigated for potential use as highly efficient ...
Experimental considerations of higher order parametric x-rays from silicon crystals of varying thicknesses Evertson, Scott Richard (Monterey, California. Naval Postgraduate School, 1992-06);Generation of parametric X-radiation (PXR) may be described as the Bragg scattering of virtual photons to 2dsin0(B), where 0(B) is the angle between the electronic beam and the crystal plane. Enhanced higher order parametric ...