HIGH-VOLTAGE HIGH-POWER RESISTIVE DIVIDER FOR TFTR NEUTRAL-BEAM POWER SUPPLY.

The neutral-beam source at the Tokamak Fusion Test Reactor (TFTR) requires a voltage divider to supply the gradient grid. The requirements are simple, but stringent: it must dissipate 576 kW of peak power at 120 kV dc. Average power is 19. 2 kW. A description is given of a resistive divider, indirectly water cooled, which has been successfully developed for this purpose. The divider is unusually large physically, weighing 1290 kg when filled, and its cooling system is believed to be unique. The heat capacity of the system reliably averages the pulse power, and there are no pumps or other moving parts. Operation of the system, which is intrinsically self-regulating, is relatively unaffected by leakage or noncondensible gas.