Title : ( Numerical and Monte Carlo study of positron production in a hybrid scheme based on 〈1 0 0〉 axial channeling radiation in a Si single crystal )
Authors: Seyed Ali Mahdipour , Behnam Azadegan , Ali Asghar Mowlavi , M. Shafeei , Wolfgang Wagner ,
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Abstract
The non-conventional (hybrid) scheme of a positron source using GeV electron beams is investigated by means of our Mathematica and GEANT4 simulation codes. Axial channeling radiation (CR) is generated in a Si single crystal (radiator) and subsequently converted into e+–e− pairs in an amorphous tungsten (W) target (converter). We will present numerical calculations of axial CR spectra from relativistic electrons of different energies channeled in a Si single crystal. Applying both the dipole and non-dipole approach, comparison reveals a striking difference between obtained energy distributions of axial CR. Positron spectra obtained by pair production and captured by an adiabatic matching device (AMD) are simulated using GEANT4 toolkit. The AMD provides an axial magnetic field of upstream decreasing strength between the converter and the aperture of some pre-accelerating structure (linac). We also present Monte-Carlo simulation results of positron-beam emittance and transverse beam-density distribution behind the W converter and behind the AMD.
Keywords
Axial channeling radiationPositron productionPositron source
@article{paperid:1087518,
author = {Seyed Ali Mahdipour and Behnam Azadegan and Mowlavi, Ali Asghar and M. Shafeei and Wolfgang Wagner},
title = {Numerical and Monte Carlo study of positron production in a hybrid scheme based on 〈1 0 0〉 axial channeling radiation in a Si single crystal},
journal = {Nuclear Instruments and Methods in Physics Research B},
year = {2019},
volume = {458},
month = {November},
issn = {0168-583X},
pages = {72--76},
numpages = {4},
keywords = {Axial channeling radiationPositron productionPositron source},
}
%0 Journal Article
%T Numerical and Monte Carlo study of positron production in a hybrid scheme based on 〈1 0 0〉 axial channeling radiation in a Si single crystal
%A Seyed Ali Mahdipour
%A Behnam Azadegan
%A Mowlavi, Ali Asghar
%A M. Shafeei
%A Wolfgang Wagner
%J Nuclear Instruments and Methods in Physics Research B
%@ 0168-583X
%D 2019
