CEA, Gif-sur-Yvette
GANIL, Caen
LPSC, Grenoble
The iRFU institute of CEA Saclay is in charge of the 12 low beta cryomodules that will be installed on the first section of the SPIRAL2 superconducting LINAC. Each cryomodule houses a single QWR cavity at 88MHz cooled with liquid helium at 4.5K. The RF full power tests were performed on the qualifying cryomodule at the end of 2008 and the beginning of 2009, and the two first cavities of the series cavity were tested in vertical cryostat before the summer 2009. A summary of these tests and the present status of this project are reported.
IPN, Orsay
CEA, Gif-sur-Yvette
LPSC, Grenoble
The SPIRAL2 superconducting linac will be composed of 19 cryomodules of 2 different types: 12 cryomodules type A housing one QWR each (beta 0.07, 88 MHz,) followed by 7 cryomodules type B housing a couple of QWRs each (beta 0.12, 88 MHz). Two prototypes (one type A and one type B) have been constructed and successfully tested in 2009. The test results will be presented, as well as, the status on cavities and cryomodules production.
FZJ, Jülich
CEA, Gif-sur-Yvette
The driver of the International Fusion Material Irradiation Facility (IFMIF) consists of two 125 mA, 40 MeV cw deuteron accelerators [1-2]. A superconducting option for the 5 to 40 MeV linac based on Half-Wave Resonators (HWR) has been chosen. The first cryomodule houses 8 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 with resonant frequency of 175 MHz and geometric beta=v/c=0.094. This paper describes the RF design of half-wave length resonator together with structural analyses. Detailed simulations of resonance multipactor discharge in HWR are presented. Due to the required high coupling, the power coupler is located in mid-plane of the cavity. Several cavity tuning options were investigated: the capacitive tuner located in mid-plane and opposite to the power coupler port offers a large tuning range and will be tested first.
CEA, Gif-sur-Yvette
IFMIF is the future neutrons irradiation facility that aims to qualify advanced materials for the fusion reactors successor to ITER. The required neutrons flux is created from the irradiation of a lithium target by two high intensity deuteron ion beams (125 mA @ 40 MeV CW) produced by two parallel superconducting accelerators. The niobium cavities are Half Wave Resonators (HWR) at 175 MHz operating at 4.5K. All cavities are equipped with the same power coupler designed to transfer a maximum power of 200 kW in CW. The present phase of the project, IFMIF-EVEDA, is aimed to validate the technical options for IFMIF, by the construction of an accelerator prototype: 1 cryomodule with 8 HWRs and 8 couplers providing RF power up to 70 kW. Nevertheless, these couplers are designed to be able to operate at 200 kW, and they will be tested and conditioned at this power. This paper describes the overall operating requirements of these high power couplers, presents the main choices that have been made up to now and the RF design of the coupler components.
CEA, Gif-sur-Yvette
The development of the IFMIF accelerator prototype is in progress within the framework of the EVEDA phase (Engineering Validation and Engineering Design Activities). This prototype will be installed at Rokkasho (Japan) and will allow testing the key systems. The first warm section composed of the deuteron source, beam lines and RFQ will prepare the beam for the cryomodule (CW 125mA at 5 MeV). The 8 HWR superconducting cavities equipped with a 200kW power coupler will accelerate the beam up to the maximum energy of 9 MeV. The design of the IFMIF/EVEDA accelerator prototype is briefly presented, and the general layout of the cryomodule is detailed.