Design considerations and experimental estimation of temperature coefficient of resistance of W-Re heater for high power pulse magnetrons

摘要

This paper deals with the design methodology of the heater for an indirectly-heated oxide-coated-cathode of a 3MW S-Band Pulse Magnetron. The temperature coefficient of resistance of 97%Tungsten - 3%Rhenium (W97-Re3) wire has been experimentally estimated. A value in the range of 3.07 x 10(-3) - 3.43 x 10(-3) per degrees C has been estimated over the temperature range of 863-1439 degrees C. An approach to design the heater has been evolved in order to ensure quality, reliability, and long life of high power magnetrons.