Presentation Information
[2E02【論文賞】]Liquid Lithium Flow Demonstration and Vacuum Characteristics Study for Design of a LINAC Based Neutron Source with Free Surface Liquid Li Target System
*Takashi Ebisawa1, Kai Masuda1, Makoto Oyaizu1, Noriyosu Hayashizaki2, Shota Ikeda2 (1. QST Rokkasho (Japan), 2. Science Tokyo (Japan))
High intensity accelerator-driven neutron sources with a free surface liquid lithium (Li) target system are widely designed and developed due to the effective heat dissipation under high beam power load. However, contamination and vacuum degradation by liquid Li are a concern. Therefore, experimental verification of the outgas rate, residual gas type and Li vapor behavior are required for different conditions of operational temperature and flow velocity of the liquid Li. For this study, we designed and constructed the dedicated experimental setup to demonstrate the interface between the accelerator and the liquid Li target system with some instruments to detect the vacuum characteristics. The high outgassing rate and peak of 28 were concluded under differential pumping. Although Li deposition rate increased with increasing operational temperature, it showed an inverse correlation to the flow velocity.
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