Multipacting studies for the JAEA-ADS five-cell elliptical superconducting RF cavities

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

The Five-cell Elliptical Superconducting Radio-Frequency Cavities (SRFC) provide the final acceleration in the JAEA-ADS linac (from 600 MeV to 1.5 GeV); thus, their performance is essential for the success of the JAEA-ADS project. After their optimization of the cavity geometry to achieve a high-acceleration gradient with lower electromagnetic peaks, the next step in the R&D strategy is the accurate estimation of beam-cavity effects which can affect the performance of the cavities. To this end, multipacting studies were developed to investigate its effect in the cavity operation regimen and find countermeasures. The results of this study will help in the development of the SRFC models and in the consolidation of the JAEA-ADS project.