High Efficiency Cyclotron Trap Assisted Positron Moderator

Instruments

Saverio Braccini¹  TommasoStefano Carzaniga¹  Ulli Köster²  André Rubbia³  Paolo Crivelli³  Lars Gerchow³  Max Döbeli³  David Cooke³  Klaus Kirch³  Arnold Müller³  Christiaan Vermeulen⁴  NicholasP. van der Meulen⁵ 

[1] Albert Einstein Center for Fundamental Physics (AEC), Laboratory for High Energy Physics (LHEP), University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland;Institut Laue Langevin, 6 rue Jules Horowitz, F-38042 Grenoble CEDEX 9, France;Institute for Particle Physics, ETH Zurich, Otto-Stern Weg 5, CH-8093 Zurich, Switzerland;Los Alamos National Laboratory, Los Alamos, NM 87545, USA;Paul Scherrer Institute, CH-5232 Villigen, Switzerland;

关键词: positron;    moderation;    moderation efficiency;    moderator;    cyclotron trap;    magnetic bottle;    thin film source;   

DOI  :  10.3390/instruments2030010

来源: DOAJ

【 摘 要 】

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+ 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 48V 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.

【 授权许可】

Unknown