Current Status of R&D and Device Manufacturing for ITER Procurement by Japan

Several key components of ITER – such as toroidal filed (TF) coils, conductor for center solenoid (CS) coils, components of neutral beam (NB) system, electron cyclotron heating system, divertor, detritiation system, blanket remote handling system, plasma diagnostic systems, and test blanket system – have been designed and manufactured by JADA (Japan Domestic Agency) for ITER project. The recent highlights of progress and achievements by JADA will be reported. JADA procures all TF coil structures (19 sets), and a TF coil structure comprises inboard and outboard structure. The 4th TF coil structure has already been delivered to EU. Regarding the inboard structure, 10 sets of manufacturing have been completed, and 9 sets of welding assembly processes are ongoing. Regarding the outboard structure, 8 sets of manufacturing have been completed, and 11 sets of welding assembly processes are ongoing. JADA assembles 9 TF coils, and an assembly process of the 1st and 2nd TF coil is carrying out. Regarding the 1st TF coil, case closure welding and gap-filling impregnation have been completed, and then its final machining has started. Regarding the 2nd TF coil, the case closure welding has been completed, and the gap-filling impregnation will be started soon. The Final Acceptance Test (FAT) of 1st and 2nd TF coils will be completed by the end of 2019 and March 2020, respectively. JADA has contributed to the construction of the NB test facility (NBTF) at Padua in Italy, which has the identical design to the ITER NB system. Components for high voltage (HV) power supply – such as HV bussing, 1 MV transmission line, DC generators, and the test power supply – were fabricated and were delivered to Padua. The first integration test between components procured by EU and Japan has been completed in July 2019. DC 1.2 MV for 1 hour was applied to the high voltage deck 1 (HVD1, EU) and to the 1 MV insulating transformer (JA) through the 1 MV transmission line (JA). In September 2019, all components from the terminal of JA component to the Beam Source Vessel (EU) were finally connected by installing HV busing as the 1MV feedthrough to beam source. The FAT will be started in 2020. JADA procures 8 gyrotrons for heating and current drive. The FATs have been passed for 1st and 2nd gyrotron. Achieved parameters on CW operation were output power 1MW for 300 s with 50% of efficiency, 95 % of repeatability. 5 kHz power modulation for 60 seconds is also achieved. Regarding 3rd and 4th gyrotron, manufacturing has been completed, and conditioning of the 3rd gyrotron has started. Manufacture of anode/body power supplies for 4 gyrotrons also have been completed. As stated above, procurement activities carried out by JADA make steady progress in accordance with agreed schedule.
12th Asia Plasma and Fusion Association Conference