STUDY AND REALIZATION OF THE FIRST SUPERCONDUCTING HALF WAVE RESONATOR FOR THE SRF LINAC OF THE IFMIF PROJECT

In the framework of the International Fusion Materials Irradiation Facility (IFMIF), which consists of two high power CW accelerator drivers, each delivering a 125 mA deuteron beam at 40 MeV, an accelerator prototype (EVEDA) is presently under design for the first phase of the project [1]. A superconducting option has been chosen for the 9 MeV RF Linac, based on a cryomodule composed of 8 low-beta Half-Wave Resonators (HWR), 8 Solenoid Packages and 8 RF couplers. This paper will focus on the HWR sub-system: the RF, thermo mechanical design, and the realization of the first prototype of HWR will be presented. The resonator tuning frequency is controlled by an innovating tuning system, located in the central region of the cavity. The different options for tuning will be discussed and the final thermo mechanical design will be detailed. A dedicated testbench for the tuning system under development is presented.