Japan Atomic Energy Research Institute

Kabushiki Kaisha Toshiba

Mamoru Matsuoka

Osamu Higa

An acceleration power supply includes a series-connected semiconductor switches with voltage dividing elements and another semiconductor switch coupled in series to the series-connected semiconductor switches for cutting off a power supply line connected to a load of the apparatus. The series-connected semiconductor switches and cutting-off semiconductor switch have a function of a series regulator.

Acceleration power supply

The present invention provides an arc discharge abnormality detecting system which in generating source plasma by the arc discharge using a plurality of filaments as the cathode in an ion source, detects an arc discharge current flowing in each of the filaments and detects the abnormality in the arc discharge when the arc discharge currents are not balanced. Further, the present invention provides an arc discharge abnormality detecting system in which said ion source is an ion source used in a neutral beam injector and a logic circuit detects the abnormality in the arc discharge when unbalance in the arc discharge currents larger than a predetermined value exists between the filaments over a predetermined period of time continuously.

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Ibaraki, Japan

Mamoru Matsuoka