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A Slow Positron Facility at Hebrew University
Dan Cohen[1] , Aidan Kelleher[1] , Michael Paul[1] , Ruty Weiss-Babai[3] , Sharon Beck[4] , Erez Cohen[2] , Or Chen[2,4] , Iris Sabo[3] , Eli Piasetzky[2] , Guy Ron[1]
[1] The Hebrew University of Jerusalem
[2] Tel Aviv University
[3] Nuclear Research Center - Soreq
[4] Nuclear Research Center Negev
Slow positrons have become a unique probe for research into both surface and bulk material properties. When positrons interact with electrons, they either annihilate or form positronium which then decays. In both cases they produce gamma rays that can be detected. Spectroscopy of the annihilation gamma rays (positron annihilation spectroscopy) is a non-destructive technique to study voids, defects and Fermi surfaces in solid matter physics. SPOT is a room-sized positron annihilation facility currently under construction at Hebrew University, expected to begin operation in early 2014. The facility will consist of a high activity source, a novel positron moderator, an electrostatic accelerator, a magnetic guided beam, and a precision detector. The design has benefited from simulation work performed at Hebrew University and Tel Aviv University. When complete, the facility will provide a high intensity beam with energies ranging from 30eV to 50keV, with a resolution of a few (1-3) eV. This project is a collaboration between Tel-Aviv University, Hebrew University, Nuclear Research Center - Soreq, and Nuclear Research Center Negev, supported by the department of industry under the KAMIN program.