Speaker
Description
Japan Atomic Energy Agency (JAEA) has been proposing an accelerator-driven nuclear transmutation system (ADS) to efficiently reduce high-level radioactive waste generated in nuclear power plants. As a first step toward the practical design of the JAEA-ADS linac, we are currently prototyping a low-$\beta$ ($\approx$0.2) single-spoke cavity. The fabrication process for the prototype spoke cavity was investigated in fiscal year 2019, and the actual cavity fabrication started in 2020. Most of the cavity parts were shaped in fiscal year 2020 using press-forming and machining. We started joining the shaped cavity parts together by electron-beam welding in 2021, and the cavity fabrication was finally completed in fiscal year 2024. We are now proceeding with surface preparation of the fabricated cavity. In this presentation, progress of the cavity processing such as chemical polishing and heat treatment will be presented.
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