Speaker
Description
Japan Atomic Energy Agency (JAEA) has been proposing an accelerator-driven nuclear transmutation system (ADS). As a first step toward the practical design of the JAEA-ADS linac, we have been prototyping a low-beta (~0.2) single-spoke cavity. Fabrication of the prototype spoke cavity was finally completed in FY2024. We are currently working on surface preparation for a high-field cavity testing at liquid helium temperature. In FY2025, we performed chemical polishing on the inner surface of the fabricated cavity, and subsequently proceeded to vacuum heat treatment. Although a uniform removal of the surface layer could not be achieved as initially anticipated, there were no defects observed on the inner surface. Hydrogen content of the chemically polished cavity was reduced through the furnace baking at J-PARC.
Funding Agency
This work was supported by JSPS KAKENHI Grant Number JP24H00235.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted. |
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