Channeling 2016

Total Yield and Spectra of Positrons Produced by Channeling Radiation from 0.1 – 1.5 GeV Electrons

27 Sept 2016, 18:40

Poster PS2: Poster Session

Speaker

Mr Sergei Abdrashitov (National Research Tomsk Polytechnic University)

Description

As is known, the channeling radiation (CR) of high-energy electrons in a crystalline target (radiator) and subsequent electron-positron pair production in downstream amorphous target (convertor), so called a “hybrid” solution [1, 2], is the effective positron source. The Mathematica™ code BCM-1 [3] developed by the authors enables calculating the trajectories and radiation spectra of electrons and positrons at channeling in crystals. This code combined with the approach sugested in [4] was used to perform the comparison of the positron yield in a thin amorphous W converter produced by bremsstrahlung, by axial 〈100〉 and planar (110) channeling radiation in a W crystal [5]. Here we investigate the dependence of total positron yield from incident electron beam energy. The hybrid scheme of positron source using the radiation from 0.1 – 1.5 GeV axially channeled electrons for the case of using W crystalline radiator and thick Si, Ge and W amorphous converters is considered. Computer simulation is carried out taking into account positron stopping in the convertor. References 1. R. Chehab et al. Physics Letters B 525 (2002) 41. 2. X. Artru, R. Chehab, M. Chevallier, V.M. Strakhovenko, A. Variola, A. Vivoli, Nucl. Instr. Meth. B 266 (2008) 3868. G.Alexander, J.Barley, Y.Batygin, et al. Phys. Rev. Lett. 100 (2008) P.210801. 3. O.V. Bogdanov, E.I. Fiks, K.B. Korotchenko, Yu.L. Pivovarov, T.A.Tukhfatullin, J. of Phys.: Conf. Ser. 236 (2010) 1; doi:10.1088/1742-6596/236/1/012029. 4. V.A. Dolgikh, Yu.P. Kunashenko, Yu.L. Pivovarov, Nucl. Instr. Meth. B 201 (2003) 253. 5. S. V. Abdrashitov, O. V. Bogdanov, S. B. Dabagov, Yu. L. Pivovarov, T. A. Tukhfatullin, Nucl. Instr. Meth. B 355 (2015) 65-68; DOI 10.1016/j.nimb.2015.03.091