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High Efficiency Cyclotron Trap Assisted Positron Moderator

We report on the realisation of a cyclotron trap assisted positron tungsten moderator for the conversion of positrons with a broad keV–few MeV energy spectrum to a mono-energetic eV beam with an efficiency of 1.8(2)% defined as the ratio of the slow positrons divided by the β+ β+ activity of the rad...

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Published in:Instruments (Basel) 2018-09, Vol.2 (3), p.10
Main Authors: Gerchow, Lars, Braccini, Saverio, Carzaniga, Tommaso, Cooke, David, Döbeli, Max, Kirch, Klaus, Köster, Ulli, Müller, Arnold, van der Meulen, Nicholas, Vermeulen, Christiaan, Rubbia, André, Crivelli, Paolo
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creator Gerchow, Lars
Braccini, Saverio
Carzaniga, Tommaso
Cooke, David
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Kirch, Klaus
Köster, Ulli
Müller, Arnold
van der Meulen, Nicholas
Vermeulen, Christiaan
Rubbia, André
Crivelli, Paolo
description We report on the realisation of a cyclotron trap assisted positron tungsten moderator for the conversion of positrons with a broad keV–few MeV energy spectrum to a mono-energetic eV beam with an efficiency of 1.8(2)% defined as the ratio of the slow positrons divided by the β+ β+ activity of the radioactive source. This is an improvement of almost two orders of magnitude compared to the state of the art of tungsten moderators. The simulation validated with this measurement suggests that, using an optimised setup, even higher efficiencies are achievable. A novel method for the production of 48 48 V high-activity thin foil positron sources based on a solid target station at a medical cyclotron was developed. This is an improvement of more than one order of magnitude with respect to standard methods.
doi_str_mv 10.3390/instruments2030010
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subjects Charged particles
cyclotron trap
Cyclotrons
Efficiency
Energy
Energy conversion efficiency
Energy spectra
Foils
International conferences
Laboratories
magnetic bottle
moderation
moderation efficiency
moderator
Moderators
Physics
positron
Positrons
thin film source
Titanium
Tungsten
title High Efficiency Cyclotron Trap Assisted Positron Moderator
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