A Novel Gd2Hf207 Ceramic Cathode Applied in High-Power Magnetron Tubes of Medical Linear Accelerator

In order to improve the output power and service life of the high-power magnetron, a new type of Gd
2
Hf
2
0
7
ceramic cathode was developed. We had tested the thermal emission and service life characteristics of the Gd
2
Hf
2
0
7
ceramic cathode. The results show that the cathode can provide
$\boldsymbol{0.10\mathrm{A}/\text{cm}^{2},1.93\mathrm{A}/\text{cm}^{2}}$
current density at 1300°C br, 1600°C br respectively under 300V anode voltage. The service life of the cathode is more than 4000 h with a load of 0.5A/cm
²
at 1500°Cbr.