Electromagnetic design of the low beta cavities for the JAEA ADS

Yee-Rendon, B. ; Kondo, Yasuhiro   ; Maekawa, Fujio  ; Meigo, Shinichiro   ; Tamura, Jun  

The Japan Atomic Energy Agency (JAEA) is designing a superconducting CW H linear accelerator for the ADS project. The superconducting region will use five types of radio frequency cavities. In the region from 10 to 180 MeV the acceleration will be done using Half Wave Resonator (HWR) and Spokes cavities. HWR cavities will accelerate the beam from 2 to 10 MeV with a geometrical beta of 0.08 and the Spoke ones will do from 10 to 180 MeV using two cavity families with geometrical betas of 0.16 and 0.43. The results of electromagnetic model design are presented and the comparison with similar cavities from other projects are included.