TY - JOUR
T1 - Breaking the power law
T2 - Multiscale simulations of self-ion irradiated tungsten
AU - Jin, Miaomiao
AU - Permann, Cody
AU - Short, Michael P.
N1 - Funding Information:
All authors gratefully acknowledge funding by the Idaho National Laboratory (INL) Nuclear University Consortium (NUC) ( LDRD 10-112583 ), under the Laboratory Directed Research and Development (LDRD) Grant No. 10-112583 . The authors also acknowledge many useful conversations with Sidney Yip of MIT, Stanislav Golubov of the Oak Ridge National Laboratory (ORNL), and the entire MOOSE development team at INL, particularly Daniel Schwen, Derek Gaston, and Richard Martineau.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/6
Y1 - 2018/6
N2 - The initial stage of radiation defect creation has often been shown to follow a power law distribution at short time scales, recently so with tungsten, following many self-organizing patterns found in nature. The evolution of this damage, however, is dominated by interactions between defect clusters, as the coalescence of smaller defects into clusters depends on the balance between transport, absorption, and emission to/from existing clusters. The long-time evolution of radiation-induced defects in tungsten is studied with cluster dynamics parameterized with lower length scale simulations, and is shown to deviate from a power law size distribution. The effects of parameters such as dose rate and total dose, as parameters affecting the strength of the driving force for defect evolution, are also analyzed. Excellent agreement is achieved with regards to an experimentally measured defect size distribution at 30 K. This study provides another satisfactory explanation for experimental observations in addition to that of primary radiation damage, which should be reconciled with additional validation data.
AB - The initial stage of radiation defect creation has often been shown to follow a power law distribution at short time scales, recently so with tungsten, following many self-organizing patterns found in nature. The evolution of this damage, however, is dominated by interactions between defect clusters, as the coalescence of smaller defects into clusters depends on the balance between transport, absorption, and emission to/from existing clusters. The long-time evolution of radiation-induced defects in tungsten is studied with cluster dynamics parameterized with lower length scale simulations, and is shown to deviate from a power law size distribution. The effects of parameters such as dose rate and total dose, as parameters affecting the strength of the driving force for defect evolution, are also analyzed. Excellent agreement is achieved with regards to an experimentally measured defect size distribution at 30 K. This study provides another satisfactory explanation for experimental observations in addition to that of primary radiation damage, which should be reconciled with additional validation data.
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U2 - 10.1016/j.jnucmat.2018.03.018
DO - 10.1016/j.jnucmat.2018.03.018
M3 - Article
AN - SCOPUS:85044073882
VL - 504
SP - 33
EP - 40
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
ER -