An electrostatic positron beam for atomic and molecular collision experiments

29th International Conference on Photonic, Electronic, and Atomic Collisions

Fayer, S.E.^1 ; Loreti, A.^1 ; Kövér, A.^2 ; Andersen, S.L.^3 ; Laricchia, G.^1

Department of Physics and Astronomy, University College London, Gower Street, London

WC1E 6BT, United Kingdom^1

Institute for Nuclear Research, Hungarian Academy of Science, P.O. Box 51, Debrecen

H-4001, Hungary^2

Department of Physics and Astronomy, Aarhus University, Aarhus C

DK-8000, Denmark^3

关键词: Atomic and molecular collision;    Beam energies;    Energy ranges;    Position-Sensitive Detectors;    Positron beams;    Positron scattering;    Signal-to-background ratio;    Time of flight;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/5/052070/pdf
DOI  :  10.1088/1742-6596/635/5/052070

来源: IOP

【 摘 要 】

A new electrostatic positron beam at UCL is described. The beam incorporates a re-moderator to achieve brightness enhancement, time of flight facility for beam energy determination and improved signal to background ratio and a position sensitive detector for 2-D imaging of the beam spot. The apparatus is being employed for measuring the total cross section of positron scattering from krypton and helium in the energy range of (10 - 200) eV. Results will be presented at the conference.