JT-60 neutral beam injection system

Construction of the neutral beam injection (NBI) system for the JT-60 was started in autumn of 1983. The NBI system must produce 20 MW of neutral beam power at energies of 75-100 keV for 10 sec. The system consists of 14 beamline units, a power supply system, a cryogenic system, a cooling system, an auxiliary pumping system and a control system. Each beamline unit is essentially the same as that of the prototype injector unit, which was constructed to confirm individual beamline performance. The power supply system consists of 14 units, each having a maximum rating of 100 kV, 80 A. The cryopumps are connected to a 2400 W helium refrigerator. Each beamline can be operated independently by the NBI computer system. From April 1984, each beamline will be tested at the prototype injector facility. All beamlines, after testing, will be installed on JT-60 starting in July 1985, with completion of the total system scheduled for July 1986