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A field-assisted moderator for low-energy positron beams

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Abstract

A new positron field-assisted (FA) moderator based on the drift of positrons across a cooled silicon crystal is proposed. Using estimates for both theβ + implantation profile and attainable drift velocities, the efficiency of drift to a slow e+ emitting surface is calculated using a diffusion equation which incorporates terms describing positron drift and annihilation. It is conjectured that efficiencies of up to 10% can be achieved. The use of epitaxially grown metallic suicide contacts to facilitate the application of the electric field is described and the consequences of using such contacts are fully discussed. Applications of the FA transmission mode moderator described here to produce timed brightness enhanced beams are briefly discussed.

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Authors and Affiliations

  1. Department of Physics and Astronomy, University College, Gower Street, WC1E 6BT, London, UK

    C. D. Beling, R. I. Simpson, M. Charlton, F. M. Jacobsen & T. C. Griffith

  2. Department of Physical Sciences, Galway Regional Technical College, Dublin Road, Galway, Ireland

    P. Moriarty

  3. Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong

    S. Fung

Authors
  1. C. D. Beling
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  2. R. I. Simpson
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  3. M. Charlton
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  4. F. M. Jacobsen
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  5. T. C. Griffith
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  6. P. Moriarty
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  7. S. Fung
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Beling, C.D., Simpson, R.I., Charlton, M. et al. A field-assisted moderator for low-energy positron beams. Appl. Phys. A 42, 111–116 (1987). https://doi.org/10.1007/BF00616719

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  • DOI: https://doi.org/10.1007/BF00616719

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