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SCATTER ING AND PAR AME TRIC X-R AY RADIATION OF 255 MEV ELECTRONS AT (220) C HANNE LING IN DIAMOND CRYSTAL K.B. Ko rotchenko1, Yu.L. Pi vo varo v1, Y. Takab ayashi2, T. A. Tukhfatullin1 1 To msk Polytechnic Uni versity, To msk, Russia 2 SAGA Light Source, Tosu, Japan The properties of both angular and spatial distribution of 255 MeV electrons at <100> axial channeling in thin silicon crystal have been in vestigated experi mentall y at SAGA Light Source /1 -2/ and by compu ter simulations /3/. Both experimental data and simulations show the brilliant effect of so-called "doughnut scattering" (DS) that can be used for the diagnostics of the incident beam an gular di ve rgence. The parametric X-ray radiation (PXR) angular distribution was also measured /2/. A cone-like structure typical of PXR was clearly observed, which was well reproduced b y calculations. Here, we report on a new experi ment on 255 MeV electron scattering at (220) planar channeling in 50 µm diamond crystal carried out at SAGA LS. In this work we studied (both experimentally and b y means of co mputer si mulations) the spatial and angular distributions of electrons penetrating through the crystal at (220) ali gn ment and PXR angular distribution. The co mpa rison of results obtained earlier using a thin silicon crystal is pres ented. REFERENCES 1. 2. Tak abayashi Y., Y. Takab ayashi, Research B 315 3. O. V.Bogdano v, Kaneyasu T., and Iwasaki Y., Nuo vo Ci mento C 34 (4) (2011) 221. K.B. Korotchenko, Yu.L. Pi vo varo v, T. A. Tukhfatullin, Nuclear Instru ments and Methods in Physics (2013) 105. Yu. L. Pi vo varo v, Y. Takabayashi, T. A. Tukhfatullin, J. of Phys.: Conf. Ser. 357 (2012) 012 030.

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