放射線損傷計算モデル

Study

Radiation damage calculation model

We are developing a calculation model to derive the index amount of damage caused by irradiation of accelerator equipment using the PHITS code. Here, the calculation model is verified by measuring the data related to the cross-sectional area of the metal ejected by proton irradiation and the primary knock-on (PKA) atom. There are few examples of such experiments in the world, and we are developing new irradiation devices and detectors.
In the research so far, we have developed an irradiation device that can cool the metal without refrigerant, and succeeded in obtaining the increase in electrical resistance due to the metal defect related to the ejection cross-sectional area. In addition, this experiment revealed that the calculated values of the latest model (arc) reproduce the experimental values better than the calculated values of the conventional irradiation damage model (NRT).

Proton irradiation device

Comparison of experimental and calculated displacement cross sections of copper to proton energy

References
Experiments
[1] Y. Iwamoto et.al., Measurement of the displacement cross-section of copper irradiated with 125 MeV protons at 12 K, J. Nucl. Materials, 458, 369-375 (2015).
DOI:https://doi.org/10.1016/j.jnucmat.2014.12.125

[2] Y. Iwamoto et.al., Measurement of displacement cross sections of aluminum and copper at 5K by using 200 MeV protons, J. Nucl. Materials, 508, 195-202 (2018).
DOI:https://doi.org/10.1016/j.jnucmat.2018.05.038

[3] Y. Iwamoto et.al., Measurements of Displacement Cross Section of Tungsten under 389-MeV Proton Irradiation and Thermal Damage Recovery, Materials Science Forum, 1024, 95-101 (2021).
DOI:https://doi.org/10.4028/www.scientific.net/msf.1024.95

Calculations
[1] Y. Iwamoto et.al., Improvement of radiation damage calculation in PHITS and tests for copper and tungsten irradiated with protons and heavy-ions over a wide energy range, Nucl. Instr. Meth. B, 274, 57-64 (2012).
DOI:https://doi.org/10.1016/j.nimb.2011.11.038

[2] Y. Iwamoto et.al., Calculation of displacement cross-sections for structural materials in accelerators using PHITS event generator and its applications to radiation damage, J. Nucl. Sci. Eng., 51, 98-107 (2014).
DOI: https://doi.org/10.1080/00223131.2013.851042

[3] Y. Iwamoto, Implementing displacement damage calculations for electrons and gamma rays in the Particle and Heavy-Ion Transport code System, Nucl. Instr. Meth. B, 419, 32-37 (2018).
DOI: https://doi.org/10.1016/j.nimb.2018.01.028

[4] Y. Iwamoto et.al., Estimation of reliable displacements-per-atom based on athermal-recombination-corrected model in radiation environments at nuclear fission, fusion, and accelerator facilities , J. Nucl. Materials, 538, 152261 (2020).
DOI: https://doi.org/10.1016/j.jnucmat.2020.152261

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