Monte Carlo simulations of cascade defect distributions in thin foil and bulk irradiations using the trim code

A. Horsewell

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The TRIM code has been used to simulate cascade damage due to 20 ke V, 200 keV and 2 Me V self-ions in isolated thin foils, stacked thin foils, and bulk specimens of Al, Cu and Au. Foil thickness and geometry dependant variations in the partitioning between energy loss processes were recorded. In stacked thin foils, separated by vacuum, secondary recoils were seen to be emitted in divergent trajectories across the gap into the second foil. As a result, many sub-cascades produced in thin foil irradiations do not occur in sub-cascade groups. Also, energy transfer from primary to secondary recoils occurs over shorter distances with increasing atomic number of the target; therefore, the number of interstitials ejected from foil surfaces increases correspondingly. The differences between the size, density and distribution of residual cascade defects observed in thin foil and bulk irradiations are discussed in terms of differences in sub-cascade interactions and the loss of interstitials to surfaces.
    Original languageEnglish
    JournalRadiation Effects and Defects in Solids
    Volume117
    Issue number4
    Pages (from-to)273-284
    ISSN1042-0150
    DOIs
    Publication statusPublished - 1991

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