| 摘要 |
PURPOSE:To improve corona discharge resistance by exposing rectifiers aligned in parallel with a support in a ring form in insulative gas. CONSTITUTION:Rectifiers 9 are applied to a DC high voltage generator made of Cockcroft circuit 3 of an electron beam illuminator 1, and the illuminator 1 is so composed as to contain the Cockcroft circuit 3 and an acceleration tube 4, etc. in a pressure vessel 2 in which insulating gas is filled and to irradiate an electron beam from an irradiation window 51 provided in an irradiation unit 5, The circuit 3 has a power transformer 6, an AC side capacitor 7, a DC side capacitor 8 and rectifiers 9. The rectifiers 9 are formed by gathering them at an insulating shaft 11 of a plurality of element assembly 10. Thus, since the rectifiers of heat generators are not buried in a molding resin, but exposed in the gas, heat can be rapidly dissipated.
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