학술논문
Positron production using a 9 MeV electron linac for the GBAR experiment
Document Type
Author
Charlton, M.; Choi, J. J.; Chung, M.; Cladé, P.; Comini, P.; Crépin, P.-P.; Crivelli, P.; Dalkarov, O.; Debu, P.; Dodd, L.; Douillet, A.; Guellati-Khélifa, S.; Hervieux, P.-A.; Hilico, L.; Husson, A.; Indelicato, P.; Janka, G.; Jonsell, Svante; Karr, J.-P.; Kim, B. H.; Kim, E.-S.; Kim, S. K.; Ko, Y.; Kosinski, T.; Kuroda, N.; Latacz, B.; Lee, H.; Lee, J.; Leite, A. M. M.; Lévêque, K.; Lim, E.; Liszkay, L.; Lotrus, P.; Louvradoux, T.; Lunney, D.; Manfredi, G.; Mansoulié, B.; Matusiak, M.; Mornacchi, G.; Nesvizhevsky, V. V.; Nez, F.; Niang, S.; Nishi, R.; Nourbaksh, S.; Park, K. H.; Paul, N.; Pérez, P.; Procureur, S.; Radics, B.; Regenfus, C.; Rey, J.-M.; Reymond, J.-M.; Reynaud, S.; Roussé, J.-Y.; Rousselle, O.; Rubbia, A.; Rzadkiewicz, J.; Sacquin, Y.; Schmidt-Kaler, F.; Staszczak, M.; Tuchming, B.; Vallage, B.; Voronin, A.; Welker, A.; van der Werf, D. P.; Wolf, S.; Won, D.; Wronka, S.; Yamazaki, Y.; Yoo, K.-H.
Source
Nuclear Instruments and Methods in Physics Research Section A. 985
Subject
Language
English
ISSN
0168-9002
1872-9576
1872-9576
Abstract
For the GBAR (Gravitational Behaviour of Antihydrogen at Rest) experiment at CERN's Antiproton Decelerator (AD) facility we have constructed a source of slow positrons, which uses a low-energy electron linear accelerator (linac). The driver linac produces electrons of 9 MeV kinetic energy that create positrons from bremsstrahlung-induced pair production. Staying below 10 MeV ensures no persistent radioactive activation in the target zone and that the radiation level outside the biological shield is safe for public access. An annealed tungsten-mesh assembly placed directly behind the target acts as a positron moderator. The system produces 5 x 10(7) slow positrons per second, a performance demonstrating that a low-energy electron linac is a superior choice over positron-emitting radioactive sources for high positron flux.