[1L15-20] Fusion Reactor Materials 2

5:30 PM - 5:45 PM JST(8:30 AM - 8:45 AM UTC)

[1L20] Investigation of Heat Transport in a High-Speed Liquid Lithium Target under Ion Beam Irradiation for Fusion Neutron Sources.

*Masakazu Kooka¹, Eiji Hoashi¹, Takafumi Okita¹, Daiki Fukunaga¹ (1. OSAKA UNIVERSITY)

Keywords:

Fusion Neutron Sources,Liquid Li,Thermal-hydraulic LES

In developing fusion neutron sources (FNS) such as A-FNS (Japan) and IFMIF-DONES (EU), evaluating the thermal margin of liquid lithium targets irradiated by deuteron beams is essential. This study conducts thermal-fluid simulations for a 25 mm-thick liquid Li target. Large eddy simulation (LES) of single-phase Li flow was performed, and the obtained velocity field fixed for subsequent thermal analysis to reduce computational cost. Beam-induced heat sources were modeled using the Bethe–Bloch formula. Flow velocities of 10, 15, and 20 m/s and beam energies of 39, 40, and 41 MeV were examined. Results showed that vortex structures at low velocities promoted thermal mixing, enhancing thermal margin. Under low-speed and higher beam energy, heat transport toward the rear wall was observed.