SIMULTANEOUS COMPUTATION OF HIGHER EIGENMODES IN LOSS-FREE WAVE-GUIDES AND CAVITIES

In some applications (e.g. gyrotrons, particle accelerators) the highe r modes of waveguides and resonant structures are of interest. The com putation is difficult since most of the methods calculate either extre mal eigenvalues or the inversion of the system matrix is necessary. Th e presented method extends the subspace iteration with polynomial acce leration to non extremal eigenvalues by using special polynomials. Thi s enables the simultaneous iteration of a group of eigenvalues inside an arbitrary frequency range during one computation run.