ELECTRICAL CIRCUIT COMPRISING AT LEAST A HIGH-VACUUM ELECTRON BEAM VALVE

摘要

1309592 Electron beam apparatus VSESOJUZNY ELEKTROTEKHNICHESKY INSTITUT IMENI V I LENINA and INSTITUT YADERNOI FIZIKI SIBIRSKOGYO OTDELENIA AKADEMII NAUK SSSR 19 March 1970 13277/70 Heading H1D A circuit comprises a valve having an anode 2 a cathode 1 and an additional electrode 3, means to maintain a constant potential difference between the cathode and anode and to maintain the additional electrode positive with respect to the anode when the voltage applied across the valve is at least several hundred kilovolts, the arrangement being such that electrons are focussed into a beam directed to the anode and there is no electron flow to other electrodes, and means to control the current by varying the potential applied to the valve, e.g to electrode 3. Further electrodes 4, 5 are provided with successively increasing and decreasing potentials to increase the dielectric strength of the valve. The cathode may be thermionic or in the form of a plasma source. In another embodiment an electrode adjacent the cathode is used to control the current.