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Report No.
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Progress of the spoke cavity prototyping for the JAEA-ADS linac

Tamura, Jun  ; Kondo, Yasuhiro   ; Yee-Rendon, B.; Meigo, Shinichiro   ; Maekawa, Fujio  ; Kako, Eiji*; Umemori, Kensei*; Sakai, Hiroshi*; Domae, Takeshi*

The Japan Atomic Energy Agency (JAEA) has been proposing an accelerator-driven nuclear transmutation system (ADS) as a future nuclear power system. Toward the actual design of the CW proton linac for the JAEA-ADS, we are currently prototyping a low-$$beta$$ ($$approx$$ 0.2) single-spoke cavity. The cavity fabrication began in 2020. Most of the cavity parts were shaped in fiscal year 2020 by press-forming and machining. In 2021, we started welding the shaped cavity parts together. Each cavity part was joined together by preliminarily examining the optimum welding conditions using mock-up test pieces. We have fabricated the body and two lid sections, and have confirmed that there were no significant problems with the cavity fabrication according to the frequency measurement of the temporarily assembled spoke cavity.

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