Electron discharge tube having improved cooling means therefor

Claim 1

THE COMBINATION WITH AN ELECTRON DISCHARGE TUBE INCLUDING AN ELECTRODE ADAPTED TO BE HEATED THROUGH ELECTRON BOMBARDMENT, OF A COOLING ARRANGEMENT FOR SAID ELECTRODE COMPRISING A HEAT EXCHANGE WALL MADE OF HEAT CONDUCTIVE MATERIAL SURROUNDING SAID ELECTRODE, A PRESSURE RESISTANT SHELL SURROUNDING SAID HEAT EXCHANGE WALL IN SPACED RELATION THEREWITH AND DEFINING A PRESSURE ENCLOSURE THEREAROUND, A BODY OF VAPORIZABLE FLUID IN SAID ENCLOSURE, HEAT DISSIPATING FORMATIONS PROVIDED ON THE OUTER SURFACE OF SAID HEAT EXCHANGE WALL PROJECTING INTO SAID FLUID TO VAPORIZE SAME AND DIMENSIONED IN ACCORDANCE WITH THE RELATIONS B=M$AC AND D<B/3, WHEREIN B IS THE DEPTH OF THE GROOVES, D THE WIDTH THEREOF, A THE AVERAGE THICKNESS OF THE RIBS, C THE HEAT CONDUCTIVITY OF SAID WALL MATERIAL AND M A NUMERICAL FACTOR, SAID HEATDISSIPATING FORMATIONS FURTHER HAVING A DEPTH B LESS THAN 12 MM., SO AS TO ESTABLISH STABLE TEMPERATURE GRADIENTS OVER SAID SURFACES, AND MEANS FOR MAINTAINING A PRESCRIBED PRESSURE ON SAID FLUID WITHIN THE ENCLOSURE OF AT LEAST THREE ATMOSPHERES ABOVE NORMAL ATMOSPHERIC PRESSURE.