Fluctuations in collision cascades with a realistic scattering model |
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| Affiliation: | 1. Dipartimento di Ingegneria Industriale, Università di Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Italy;2. Dipartimento di Fisica E.R. Caianiello, Università di Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Italy;3. Dipartimento di Strutture per l’Ingegneria e l’Architettura, Università di Napoli Federico II, via Claudio, 21, 80125 Napoli, Italy;4. Dipartimento di Ingegneria, Università di Napoli Parthenope, Centro Direzionale, Isola C4 80143 Napoli, Italy;1. Institute for Materials Simulation, Department of Materials Science, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Dr.-Mack-Str. 77, 90762 Fürth, Germany;2. Chair of Micromechanical Materials Modelling, Institute of Mechanics and Fluid Dynamics, Technische Universität Bergakademie Freiberg (TUBAF), Lampadiusstr. 4, 09596 Freiberg, Germany;3. Physics Department and Research Center OPTIMAS, University Kaiserslautern, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany;1. MBLEM, Department of Engineering Science, University of Oxford, Oxford, UK;2. School of Engineering, University of Aberdeen, Aberdeen, UK;1. School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230027, China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;3. Science and Technology Information Center, China Academy of Engineering Physics, Mianyang 621900, China;4. China Academy of Engineering Physics, Mianyang 621900, China;1. Dipartimento Ingegneria, Università di Palermo, Viale delle Scienze, 90128, Palermo, Italy;2. EUROfusion Consortium, Boltzmannstr.2, Garching, 85748, Germany;3. ENEA Brasimone I, Camugnano, BO 40032, Italy;4. Karlsruhe Institute for Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany |
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| Abstract: | Stochastic quantities of a collision cascade are calculated, such as variance of the sputtering yield and the defect number, as well as two-point correlation functions (in the depth variable). All calculations were made by a binary collision Monte Carlo algorithm. A realistic scattering model is used, i.e. a power law scattering function with an energy dependent exponent, and electronic stopping is also accounted for. Both infinite media (defects only) and half spaces (defects and sputtering) are considered. It is found that the variance of the defects is over-Poisson and the reason is the energy degradation process whereas the effect of the free surface is negligible. Quantitative values of various parameters, both mean values, average depth distributions, variances and two-point correlation functions are given and discussed. |
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