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Radioactive Isotope Induced by Beam Loss in Particle Accelerator for Heavy-Ion Inertial Fusion

Suzuka FUJITA, Hideki TENZO¹⁾, Kazumasa TAKAHASHI, Toru SASAKI and Takashi KIKUCHI

Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan

1)

National Institute of Technology (KOSEN), Kagawa College, Mitoyo, Kagawa 769-1192, Japan

(Received 30 November 2020 / Accepted 14 January 2021 / Published 26 February 2021)

Abstract

We investigated radiation distributions, fluences, generation rates, and radioactive isotopes induced by heavy-ion impact into a vacuum vessel wall for a particle accelerator in the heavy-ion inertial fusion (HIF). Numerical results showed that the radiation management should be considered for neutrons and photons during the HIF system operation. Compared to the detailed numerical simulation, estimations in total reaction cross-sections and threshold kinetic energy for interaction in the Coulomb barrier were expected to provide criteria as a safer side for radiation management in the HIF accelerator. The activation and the isotopes generated by the interaction between the heavy-ion and the wall material were obtained from the calculation results, which showed that the generation rate and the variation of the generated isotope increased with the incident kinetic energy of the heavy-ion beam. The calculation results also indicated that the management of radioactive materials is important for the HIF accelerator system's safe operation.

Copyright (c) 2021 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

heavy-ion inertial fusion, particle accelerator, activation, radiation distribution, radioactive isotope, beam loss, heavy-ion beam

DOI: 10.1585/pfr.16.2404022

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