RECENT DEVELOPMENTS ON SUPERCONDUCTING β035 AND β015 SPOKE CAVITIES AT IPN FOR LOW AND MEDIUM ENERGY SECTIONS OF PROTON LINEAR ACCELERATORS

Spoke cavities studies leaded by IPN-Orsay, for both PDS/XADS and EURISOL projects, are fully integrated within the 5 th and 6 th European Framework Programs. During 2003, first tests performed on the β035, 2-gap spoke cavity have demonstrated the great potential of this type of cavity in terms of RF performances (Eacc max=12.5 MV/m at T=4.2 K) and mechanical behavior (very low sensitivity to errors fabrication, good stiffness, accelerating field flatness…). In 2004, we have been able to test the cavity into super-fluid Helium thanks to the upgrade of our cryogenic facility. Last results at 4.2 K and 2 K are presented. In parallel, the fabrication of the new spoke cavity (2gap, 352 MHz, β015) has begun in January. While keeping the same geometry than the β035 cavity, we carried out significant changes on coupler port localization and stiffening system designs. Finally, we will present the preliminary thought on modular spoke-type cryomodule which are based on the “short” cryomodule concept used for the Quarter Wave Resonators in the SPIRAL-2 project.