A model for defect formation in materials exposed to radiation

Davis Sergio; González-Cataldo Felipe; Gutiérrez Gonzalo; Avaria Gonzalo; Bora Biswajit; Jain Jalaj; Moreno José; Pavez Cristian; Soto Leopoldo

doi:10.1063/5.0030158

Volume 6 Issue 1

Jan. 2021

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Davis Sergio, González-Cataldo Felipe, Gutiérrez Gonzalo, Avaria Gonzalo, Bora Biswajit, Jain Jalaj, Moreno José, Pavez Cristian, Soto Leopoldo. A model for defect formation in materials exposed to radiation[J]. Matter and Radiation at Extremes, 2021, 6(1): 015902. doi: 10.1063/5.0030158

Citation:

Davis Sergio, González-Cataldo Felipe, Gutiérrez Gonzalo, Avaria Gonzalo, Bora Biswajit, Jain Jalaj, Moreno José, Pavez Cristian, Soto Leopoldo. A model for defect formation in materials exposed to radiation[J]. Matter and Radiation at Extremes, 2021, 6(1): 015902. doi: 10.1063/5.0030158

Citation:

Davis Sergio, González-Cataldo Felipe, Gutiérrez Gonzalo, Avaria Gonzalo, Bora Biswajit, Jain Jalaj, Moreno José, Pavez Cristian, Soto Leopoldo. A model for defect formation in materials exposed to radiation[J]. Matter and Radiation at Extremes, 2021, 6(1): 015902. doi: 10.1063/5.0030158

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A model for defect formation in materials exposed to radiation

doi: 10.1063/5.0030158

Davis Sergio^{1, 2
,
,
,},
González-Cataldo Felipe^{3, 4
,
,},
Gutiérrez Gonzalo^{4
,
,},
Avaria Gonzalo^{1, 2
,},
Bora Biswajit^{1, 2
,},
Jain Jalaj^1
,,
Moreno José^{1, 2},
Pavez Cristian^{1, 2},
Soto Leopoldo^{1, 2
,
,}

1.
Comisión Chilena de Energía Nuclear, Casilla 188-D, Santiago, Chile
2.
Departamento de Física, Facultad de Ciencias Exactas, Universidad Andres Bello, Sazié 2212, piso 7, Santiago 8370136, Chile
3.
Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA
4.
Grupo de Nanomateriales, Departamento de Física, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile

More Information

Corresponding author: a)Author to whom correspondence should be addressed: sergio.davis@cchen.cl
Received Date: 2020-09-22
Accepted Date: 2020-11-29

Available Online: 2021-01-01

Publish Date: 2021-01-15

Abstract

Abstract

A simple model for the stochastic evolution of defects in a material under irradiation is presented. Using the master-equation formalism, we derive an expression for the average number of defects in terms of the power flux and the exposure time. The model reproduces the qualitative behavior of self-healing due to defect recombination, reaching a steady-state concentration of defects that depends on the power flux of the incident radiation and the material temperature, while also suggesting a particular time scale on which the incident energy is most efficient for producing defects, in good agreement with experimental results. Given this model, we discuss the integral damage factor, a descriptor that combines the power flux and the square of the irradiation time. In recent years, the scientific community involved in plasma-facing materials for nuclear fusion reactors has used this parameter to measure the equivalent material damage produced in experiments of various types with different types of radiation and wide ranges of power flux and irradiation time. The integral damage factor is useful in practice but lacks formal theoretical justification. In this simple model, we find that it is directly proportional to the maximum concentration of defects.

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References(66)

References

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