A high-voltage power supply of the neutral beam injector

For corpuscular heating of plasma in the FRC plasma plant (USA), six injectors of hydrogen atoms with a 40-keV particle energy, a 25-A equivalent current, and an operation duration of >1 s are designed, manufactured, and put into operation at the Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences (Novosibirsk). For the high-voltage powering of the neutral beam injectors, unique 40-kV high-voltage sources with a 1.7-MW power are designed and manufactured. They have a wide output voltage regulation range and are capable of being promptly switched-off in response to the high-voltage breakdown of the load. The high-voltage power pupplies of the neutral beam injectors are the subdivided rectifiers with a discretely regulated output voltage, and a specific feature of the circuit is the use of additional fast semiconductor switches, short-circuiting the outputs of the rectifying sections. The design circuit and elements are described, and test results of the high-voltage power supplies of the neutral beam injectors are given.