Abstract
We consider the radiator-converter approach at 200 MeV channeled electrons (the SPARC_LAB LNF facility energies) for the case of using W crystalline radiator and W amorphous converter. A comparison of the positron production by the axial channeling radiation and the bremsstrahlung is performed. The positron stopping in the convertor is studied by means of computer simulations. It is shown that for the maximum yield of positrons the thickness of the W amorphous converter should be taken 0.35 cm in the case of using the axial channeling radiation resulting to total yield of positrons 5 10-3 e+/e- and 0.71 cm in the case of using the bremsstrahlung resulting to total yield of positrons 3.3 10-3 e+/e-.
Highlights
The problem of the positron beam generation remains of interest during last decade, in connection with the physics of slow positrons [1], relativistic positronium atom beams [2,3,4], modern research of electron-positron plasma [5] and with the search for the effective positron source for the electron– positron colliders [6,7,8,9]
The initial high energy electron beam is used for the photon beam generation in several different ways: bremsstrahlung (BS) [10], channeling radiation (CR) [11,12] or coherent bremsstrahlung (CB) [10, 13,14], the Compton scattering [15], and even undulator radiation [16]
The second stage is to take into account the created positrons energy loss in a downstream amorphous W convertor, in order to determine the final energy spectrum of positrons leaving a convertor
Summary
The problem of the positron beam generation remains of interest during last decade, in connection with the physics of slow positrons [1], relativistic positronium atom beams [2,3,4], modern research of electron-positron plasma [5] and with the search for the effective positron source for the electron– positron colliders [6,7,8,9]. The faster way to simulate the CR intensity spectra (energy radiated during penetration through a crystal per unit crystal length) in the case of axial CR (figure 2a) from 200 MeV electrons in W is to apply the BCM-1.0 code [23]. This code was recently applied to simulate the orientation dependence of the CR total yield [18, 24]. The spectrum of positrons generated by CR from electrons in thin converter can be determined in the following way: dNP dEP n LC
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