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- W3101833319 abstract "Presently, large efforts are conducted toward the development of highly brilliant γ beams via Compton back scattering of photons from a high-brilliance electron beam, either on the basis of a normal-conducting electron linac or a (super-conducting) Energy Recovery Linac (ERL). Particularly, ERLs provide an extremely brilliant electron beam, thus enabling the generation of highest-quality γ beams. A 2.5 MeV γ beam with an envisaged intensity of 1015 photons s−1, as ultimately envisaged for an ERL-based γ-beam facility, narrow band width (10−3), and extremely low emittance (10−4 mm2 mrad2) offers the possibility to produce a high-intensity bright polarized positron beam. Pair production in a face-on irradiated W converter foil (200 μm thick, 10 mm long) would lead to the emission of 2×1013 (fast) positrons per second, which is four orders of magnitude higher compared to strong radioactive 22Na sources conventionally used in the laboratory. Using a stack of converter foils and subsequent positron moderation, a high-intensity low-energy beam of moderated positrons can be produced. Two different source setups are presented: a high-brightness positron beam with a diameter as low as 0.2 mm, and a high-intensity beam of 3×1011 moderated positrons per second. Hence, profiting from an improved moderation efficiency, the envisaged positron intensity would exceed that of present high-intensity positron sources by a factor of 100." @default.
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- W3101833319 date "2011-06-04" @default.
- W3101833319 modified "2023-09-27" @default.
- W3101833319 title "High-intensity and high-brightness source of moderated positrons using a brilliant γ beam" @default.
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- W3101833319 doi "https://doi.org/10.1007/s00340-011-4594-0" @default.
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