Study on thermionic emission of a W-Y alloy Cathode applied in magnetron

A W-Y alloy cathode applied in magnetron tube has been developed. The thermionic emission experimental results show that the dc thermionic characteristic curve of the cathode has been straight up at 1500° br with no space charge deviation point. The lifetime experimental results show that the thermionic emission current density of the cathode decreases linearly from the initial 1.5A/cm
²
to 0.2A/cm
²
after 80h lifetime testing at 1600° br.