Improvement of the Output Characteristics of a Relativistic Magnetron using a Small Diameter Cathode Surrounded by a Transparent Cathode

Conventional magnetrons in which cathodes with thermionic and/or secondary electron emission are used operate poorly when the ratio of the anode-to-cathode radius is large. This transparent cathode leads to a significant improvement in the output parameters of the magnetron (efficiency and radiation power) for an appropriate selection of the radius R_strip of the transparent cathode, in addition to providing faster start of oscillations than the techniques of cathode (Jones et al., 2004) and magnetic (Jones et al., 2004) priming alone