Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Volume 409, Issue -, Pages 251-254Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nimb.2017.05.026
Keywords
Ion irradiation; Beam contamination; Carbon
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Funding
- U.S. Department of Energy, NEUP program [DE-NE0008297]
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Self-ion irradiation is widely used as a method to simulate neutron damage in reactor structural' materials. Accelerator-based simulation of void swelling, however, introduces a number of neutron-atypical features which require careful data extraction and, in some cases, introduction of innovative irradiation techniques to alleviate these issues. We briefly summarize three such atypical features: defect imbalance effects, pulsed beam effects, and carbon contamination. The latter issue has just been recently recognized as being relevant to simulation of void swelling and is discussed here in greater detail. It is shown that carbon ions are entrained in the ion beam by Coulomb force drag and accelerated toward the target surface. Beam-contaminant interactions are modeled using molecular dynamics simulation. By applying a multiple beam deflection technique, carbon and other contaminants can be effectively filtered out, as demonstrated in an irradiation of HT-9 alloy by 3.5 MeV Fe ions. (C) 2017 Elsevier B.V. All rights reserved.
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