Abstract
At the first wall of a D-T fusion reactor very energetic displacement cascades will be produced. These cascades are initiated by 14 MeV neutron recoils of energies near 100 keV and above. Such cascades can also be produced by selfion bombardment. TEM has served in the past as a valuable tool in investigations of cascade defect structures; also quantitative correlations between cascades produced by energetic self ions and 14 MeV neutrons have been established.1 Qualitatively Figs. 1 and 2 show strong similarities between 200 keV self ion cascades and cascades produced by 14 MeV neutron bombardment of Au. Most clusters visible in Fig. 1 and 2 are thought to result from the collapse of depleted zones. The presence of multiple defect clusters is indicative of subcascade formation.The intersection of an energetic cascade with a surface will lead to the ejection of atoms or clusters of atoms. This problem of surface erosion has recently found considerable attention.
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