Mechanical and cryogenic system design of the first cryomodule for the IFMIF project

The IFMIF-EVEDA project aims to demonstrate the feasibility of a high intensity material irradiation facility and one of its main components is a prototype of a high intensity deuteron accelerator. This prototype will be built in Rokkasho in Japan. It includes a cryomodule composed of 8 superconducting cavities (HWR) powered by 200 kW couplers to accelerate the deuteron beam from 5 MeV to 9 MeV. The beam is focused inside the cryomodule by 8 superconducting solenoids. The cryomodule design has to respect some severe beam dynamics requirements, in particular a restricted space for the component interfaces and an accurate alignment to be kept during cooling down. A double cryogenic supply has been designed as it is necessary to control the cavity cooling independently from the solenoid one. The cryomodule design should also be compatible with its environment in the Rokkasho building. This paper gives a general overview of the cryomodule current design and its interfaces. It presents the concept chosen for the cryogenic systems. It also summarizes the method foreseen for the assembly and alignment and describes the integration scenario in Rokkasho.