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Report No.
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Development of {QWR}s for the Future Upgrade of {JAEA} Tandem Superconducting Booster

Kondo, Yasuhiro   ; Harada, Hiroyuki  ; Kabumoto, Hiroshi  ; Kamiya, Junichiro   ; Matsuda, Makoto  ; Moriya, Katsuhiro  ; Tamura, Jun  ; Kako, Eiji*; Domae, Takeshi*; Sakai, Hiroshi*; Umemori, Kensei*

The Japan Atomic Energy Agency (JAEA) tandem booster is one of the pioneering superconducting heavy ion linac in the world. It consists of 40 QWRs with an operation frequency of 130 MHz and $$beta_{opt} = 0.1$$, and has potential to accelerate various ions up to Au to 10 MeV/u. The user operation was started in 1994, however, it has been suspended since the Great East Japan Earthquake in 2011. Recently, in addition to the efforts to restart the tandem booster, activities to develop new lower-beta cavities to improve the acceleration efficiency of heavier ions such as Uranium has been launched. In this work, the current status of the design study of the QWRS for the JAEA tandem facility is presented. Electro-magnetic design using simulation code was performed and acceleration gradient of 5.7 MV/m and 6.6 MV/m was obtained for 130-MHz and 65-MHz QWRs, respectively.

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