Thermal Characteristics of Modulation Gate in Cold Cathode X-ray Source

A static electricity-heat transfer-structural mechanics finite element simulation model of the cold cathode X-ray tube has been proposed. The gate interception characteristics has been analyzed from material, the number of grid mesh and its shape. Concerning thermal deformation, oxygen free copper UNS C10200 has advantages over SUS304 and Mo, with excellent coefficient of thermal conductivity and temperature expansion coefficient. To optimize the electronic transmittance, the number of gate grid mesh and its shape are studied. It is found that the number of gate grid mesh needs to be optimized to balance emission performance and lifetime. And among the circular, square and octagonal gate grid mesh, the circular grid mesh has the highest electron transmittance and minimum thermal deformation.