25–30 Sept 2016
Europe/Rome timezone
deadline for abstracts has expired

Parametric X-ray radiation in the backward geometry under interaction of relativistic electrons with crystals

26 Sept 2016, 17:50
15m

Speaker

Dr Alexander Kubankin (Belgorod National Research University)

Description

Parametric X-ray radiation (PXR) appears during coherent scattering of the charged particle Coulomb field on the atomic structures. PXR was studied theoretically and experimentally in different geometries, in a wide range of charged particles energies and several crystalline targets (crystalline, polycrystalline and multilayer mirrors). Nevertheless, the backward geometry for the PXR observation represents a lacuna where both theoretical and experimental works need to be performed. The presented study is devoted to the PXR research in the backward geometry. The PXR is generated under interaction of a 7 MeV electron beam with highly oriented pyrolytic graphite (HOPG) crystals and a textured tungsten foil. HOPG crystals have mosaic angles 0.4°, 0.8° and 1.7°; the angular size of texture spread for the tungsten target is 5.4°. The PXR spectral peaks for four diffraction orders are observed and the corresponding orientation dependencies are measured for the HOPG crystals. Diffracted photons related to parametric X-ray radiation produced by relativistic electrons are detected below the low energy threshold for the X-ray diffraction mechanism in crystalline structures for the first time for the HOPG crystals and textured tungsten foil. The model developed for the studied process and its comparison with the experiments are presented in the work also. The developed experimental approach can be applied to separate the contributions of real and virtual photons to the total diffracted radiation generated during the interaction of relativistic charged particles with crystalline targets. The work was supported by a Program of the Ministry of Education and Science of the Russian Federation for higher education establishments, Project No. 3.2009.2014/K.

Primary author

Dr Alexander Kubankin (Belgorod National Research University)

Co-authors

Dr Alexander Eliseyev (P.N. Lebedev Physical Institute RAS) Dr Esteban Irribarra (Escuela Politécnica Nacional) Mr Ivan Kishin (P.N. Lebedev Physical Institute RAS) Mr Mohammad Al-Omari (Belgorod National Research University) Dr Ramazan Nazhmudinov (P.N. Lebedev Physical Institute RAS) Dr Vladimir Alexeyev (P.N. Lebedev Physical Institute RAS) Dr Vladislav Karpov (P.N. Lebedev Physical Institute RAS)

Presentation materials