JJAP Conference Proceedings

JJAP Conf. Proc. 7, 011304 (2018) doi:10.7567/JJAPCP.7.011304

Development of a high-brightness, energy-tunable positronium beam for surface scattering experiments

Koji Michishio1,2, Luca Chiari1, Fumi Tanaka1, Nagayasu Oshima2, Yasuyuki Nagashima1

  1. 1Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan
  2. 2National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
  • Received November 13, 2017
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Abstract

We have developed an apparatus, which can output a high-quality, energy-tunable positronium (Ps) beam, for fundamental studies on Ps interactions with surfaces. The beam was produced through a two-step process, in which Ps negative ions were efficiently generated by the impact of slow positrons onto a Na-coated W thin-film and were then photodetached by an infrared laser beam. An experimental system for surface scattering experiments was also constructed and tested. The Ps beam was incident on a LiF (100) crystal surface in a grazing-angle geometry and the scattered components were projected onto a position sensitive detector. We show the current status of the Ps beam apparatus and some of the test results of the surface scattering experiment.

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