CATHODE FOR MAGNETRON, AND MAGNETRON USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a cathode for a magnetron where no cathode part is required to be heated. SOLUTION: A coil-like first electron emission source 12 where needle-like particles 11 are adhered to at least a part of the surface of a first electrode 10, and a second electron emission source 15 where an oxide film 14 of high secondary emission gain is adhered to at least a part of the surface of a second electrode 13, are sandwiched between the upper and lower end hats 16, constituting a cathode part 17. The second electrode which is a second electron emission source is formed cylindrical 131, which is disposed inside the first electrode 10 that is the first electron emission source. The second electrode which is the second electron emission source has a porous metal impregnated with oxide to obtain stable secondary electron emission gain. COPYRIGHT: (C)2004,JPO&NCIPI