Title :
Inverter type high voltage DC power supply for negative-ion-based neutral beam injectors
Author :
Mizuno, M. ; Dairaku, M. ; Ohara, Y. ; Ozaki, A. ; Tanaka, S. ; Uede, T. ; Watanabe, K. ; Yamashita, Y. ; Yokoyama, K.
Author_Institution :
JAERI, Ibaraki, Japan
Abstract :
A design of a high-voltage DC power supply for future neutral beam injectors (NBI) is presented together with the latest R&D results for a 100-kV, 5-A, 5-kHz inverter-type power supply. A negative-ion based NBI is used for heating and current drive in the JT-60U (JAERI Tokamak-60 upgrade) and the FER (Fusion Experimental Reactor). For a high-voltage DC power supply of 500-1000 kV, an inverter-type DC power supply has been adopted. It consists of low-voltage converters, inverters, step-up transformers, and high-voltage rectifiers. Ion sources are protected from electrical breakdowns by stopping the inverters. As the first step, the same system was used in the 100-kV, 5-A acceleration power supply of the JAERI (Japan Atomic Energy Research Institute) electron-beam irradiation stand. The power supply is based on 5-kHz inverters. After the dummy load test, the power supply operated in conjunction with a plasma electron gun, and a 100-keV, 4-A electron beam has already been extracted
Keywords :
fusion reactor theory and design; power supplies to apparatus; 100 kV; 100 keV; 5 A; 5 kHz; FER; JT-60U; high-voltage DC power supply; high-voltage rectifiers; inverter-type power supply; inverters; low-voltage converters; negative-ion based NBI; neutral beam injectors; plasma electron gun; step-up transformers; Electron beams; Heating; Inductors; Inverters; Ion sources; Power supplies; Power system protection; Rectifiers; Transformers; Voltage;
Conference_Titel :
Fusion Engineering, 1989. Proceedings., IEEE Thirteenth Symposium on
Conference_Location :
Knoxville, TN
DOI :
10.1109/FUSION.1989.102285
