IFMIFとA-FNS計画の現状と展望

The International Fusion Materials Irradiation Facility (IFMIF) is an accelerator-based D-Li neutron source, in which 40-MeV CW deuteron beam with total current of 250-mA produced by two accelerators impact on a liquid Li stream flowing at 15 m/s (Li target). In the IFMIF/EVEDA project under the Broader Approach (BA) agreement, the Li target was continuously operated with the cold trap and satisfied the stability requirement throughout the continuous operation. The linear IFMIF prototype accelerator (LIPAc) is currently under development in Rokkasho, Japan, to demonstrate the 9 MeV/125 mA D-beam acceleration. Recently, the first proton beam was injected into the RFQ with more than 90 % transmission, followed by the achievement of a major project milestone in July 2019: 125 mA Deuteron beam accelerated at 5 MeV. The superconducting RF linac necessary for the 9-MeV D+ beam is nearing completion of the manufacturing phase and will be assembled in Rokkasho. Based on the results from the IFMIF/EVEDA project, a conceptual design of the Advanced Fusion Neutron Source (A-FNS) for its construction in Rokkasho is underway in order to obtain material irradiation data necessary for a fusion DEMO reactor. The A-FNS is composed of an accelerator with a 40-MeV and 125-mA deuteron beam, a test facility with neutron intensity of 6.8 x1016 n/s including a liquid Li target system and a post irradiation examination facility. Additionally, A-FNS is designed to be able of multipurpose utilizations for neutron application including nuclear data study and RI (radio isotopes) production.