• H. Jenhani, P. Bosland, P. Bredy, M. Desmons, G. Devanz, G. Disset, N. Grouas, P. Hardy, V.M. Hennion, J. Migne, A. Mohamed, F. Orsini, J. Plouin, J. Relland
  CEA, Gif-sur-Yvette
• B. Branas Lasala, I. Podadera Aliseda, S. Sanz, F. Toral
  CIEMAT, Madrid
• F.M. Mirapeix, C. Palacios
  TTI, Santander
• E.N. Zaplatin
  FZJ, Jülich

The driver of the International Fusion Material Irradiation Facility (IFMIF) consists of two 125 mA, 40 MeV CW deuteron accelerators. A superconducting option for the 5 to 40 MeV linac based on Half-Wave Resonators (HWR) has been chosen. The first cryomodule houses 8 HWR's supplied by high power RF couplers; each of them should be able to operate at 200 kW in CW. This paper will give an overview of the RF design of the 175 MHz CW power coupler. The detailled mechanical studies and the realization will be performed by the Industry. Global approach of the contract with the Industry and the organization of the intermediate validation tests will be discussed. In a second part, the choices and the last advances concerning the couplers RF power test stand will be described.

• G. Devanz, D. Braud, P. Carbonnier, J.-P. Charrier, S. Chel, M. Desmons, A. Hamdi, H. Jenhani, D. Roudier, P. Sahuquet
  CEA, Gif-sur-Yvette

Coaxial power couplers capable of handling 1MW peak power have been developped for high intensity superconducting proton linacs. They have been conditioned in travelling wave up to the maximum power available on the Saclay test bench, 1.2 MW forward peak power, up to 10% duty cycle. One coupler has been assembled on a 5-cell medium beta cavity in the class 10 area of the clean room, and installed in our horizontal test cryostat CryHoLab. This paper focusses on the RF operation of the coupler in this cryogenic environment and thermal aspects.