Positron energy distributions from a hybrid positron source based on channeling radiation. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms Volume 309, 2013, Pages 56-58

14 сентября 2018
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Контактные данные автора публикации Azadegan, B.a, Mahdipour, A.a, Dabagov, S.B.bc, Wagner, W.d a Hakim Sabzevari University, P.O. Box 397, Sabzevar, Iran b INFN LNF, Via E. Fermi 40, 00044 Frascati (RM), Italy c RAS P.N. Lebedev Physical Institute and NRNU MEPhI,
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Аннотация

A hybrid positron source which is based on the generation of channeling radiation by relativistic electrons channeled along different crystallographic planes and axes of a tungsten single crystal and subsequent conversion of radiation into e e--pairs in an amorphous tungsten target is described. The photon spectra of channeling radiation are calculated using the Doyle-Turner approximation for the continuum potentials and classical equations of motion for channeled particles to obtain their trajectories, velocities and accelerations. The spectral-angular distributions of channeling radiation are found applying classical electrodynamics. Finally, the conversion of radiation into e e--pairs and the energy distributions of positrons are simulated using the GEANT4 package. © 2013 Elsevier B.V. All rights reserved.
Author keywords
Channeling radiation; Positron; Positron source
Indexed keywords
Channeling radiation; Classical electrodynamics; Classical equation; Crystallographic plane; Energy distributions; Positron sources; Relativistic electron; Spectral-angular distribution
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