Effect of Parabolic Cathode Shaping on Relativistic Magnetron Performance

In this paper, it is demonstrated that shaping of the cathode along the symmetry axis in a relativistic magnetron, leads to a shift in Hull and Hartree curves in such a way that a set of curves is obtained instead of only two curves. This results to excitation of numerous harmonics and so proposing a broadband tube. As an example, without any changes in the anode structure, A6 relativistic magnetron cathode has been subjected to parabolic shaping parallel to the symmetry axis preserving the axial symmetry. To perform a study in this regard, employing a 3D particle in cell simulation, it will be shown that the output power can exceed 400MW while the frequency ranges from 5GHz to 20 GHz.