Volume 122, Number 6, June 2018
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||19 July 2018|
Experimental observation of the number of visible defects produced in individual primary damage cascades in irradiated tungsten
1 CCFE, UK Atomic Energy Authority, Culham Science Centre - Abingdon, Oxfordshire OX14 3DB, UK
2 School of Materials Science and Engineering, University of Science and Technology Beijing 100083, Beijing, China
3 Department of Physics, University of Helsinki - P.O. Box 43, FI-00014, Helsinki, Finland
Received: 5 March 2018
Accepted: 27 June 2018
We present a new analysis of nanoscale lattice defects observed after low-dose in situ self-ion irradiation of tungsten foils at cryogenic temperature. For decades, defect counts and size-frequency histograms have been the standard form of presenting a quantitative analysis of the nanoscale “black-dot” damage typical of such irradiations. Here we demonstrate a new statistical technique for generating a probability distribution for the number of defects produced in a single cascade. We show that while an average of fewer than one defect is observed per incident ion, the number of cascades with two or more visible defects produced is significant.
PACS: 61.72.J- – Point defects and defect clusters / 61.80.Az – Theory and models of radiation effects / 68.37.Lp – Transmission electron microscopy (TEM)
© EPLA, 2018
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