Eigenvalue extraction from time domain computations

[摘要] In this paper we address a fast approach for an accurate eigenfrequencyextraction, taken into consideration the evaluated electric fieldcomputations in time domain of a superconducting resonant structure. Uponexcitation of the cavity, the electric field intensity is recorded atdifferent detection probes inside the cavity. Thereafter, we perform Fourieranalysis of the recorded signals and by means of fitting techniques with thetheoretical cavity response model (in support of the applied excitation) weextract the requested eigenfrequencies by finding the optimal modelparameters in least square sense. The major challenges posed by our work are:first, the ability of the approach to tackle the large scale eigenvalueproblem and second, the capability to extract many, i.e. order of thousands,eigenfrequencies for the considered cavity. At this point, we demonstratethat the proposed approach is able to extract many eigenfrequencies of aclosed resonator in a relatively short time. In addition to the need toensure a high precision of the calculated eigenfrequencies, we compare themside by side with the reference data available from CEM3D eigenmode solver.Furthermore, the simulations have shown high accuracy of this technique andgood agreement with the reference data. Finally, all of the results indicatethat the suggested technique can be used for precise extraction of manyeigenfrequencies based on time domain field computations.

[学科分类] 电子、光学、磁材料