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Proton microbeams, their production and use

  • Microtechniques
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Abstract

Well focused beams of protons and other ions provide a very powerful means of determining how the elemental composition of a sample varies over its surface. Observation of the X-rays from proton bombardment can provide great sensitivity in most cases, while detection of nuclear effects has special applicability for elements of low atomic weight. A focusing system using high precision magnetic quadrupoles was designed and built for use with the IBIS 3 MeV Van de Graaff generator. Measurements of the first order focusing and aberrations agreed satisfactorily with theoretical predictions. The focused beam of 3 MeV protons was measured to have a diameter of less than 4 μm. The target chamber, deflection system and display system are described and examples given of use of the system. Backgrounds in X-ray detection are discussed and limits of detection are given.

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Authors and Affiliations

  1. Nuclear Physics Division, AERE, Harwell, Nr. Didcot, Berks, England

    J. A. Cookson, A. T. G. Ferguson & F. D. Pilling

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  1. J. A. Cookson
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  2. A. T. G. Ferguson
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  3. F. D. Pilling
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Cookson, J.A., Ferguson, A.T.G. & Pilling, F.D. Proton microbeams, their production and use. J. Radioanal. Chem. 12, 39–52 (1972). https://doi.org/10.1007/BF02520973

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