Positron energy distributions from a hybrid positron source based on channeling radiation

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• 作者：B. Azadegan ; A. Mahdipour ; S.B. Dabagov ; W. Wagner
• 关键词：Positron ; Positron source ; Channeling radiation
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2013
• 出版时间：15 August, 2013
• 年：2013
• 卷：309
• 期：Complete
• 页码：56-58
• 全文大小：609 K

文摘

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.