Parallel 2D large-signal modeling of cascaded TWT amplifiers

The 2.5D large-signal code TESLA-FW was recently developed with the goal to model TWT amplifiers based on the serpentine or folded-waveguide slow-wave structures. Predictions of the large-signal code, applied to the modeling of the single stage amplifiers, were found in a good agreement with the results of the 3D PIC code MAGIC, while its run-time was on orders of magnitude less. To extend applicability of the large-signal code, now we report its conversion into a parallel version, which allows us concurrently model all the stages of a multiple-beam cascaded TWT amplifiers based on serpentine or folded-waveguide slow-wave structures. Newly introduced parallel version of TESLA-FW is applied to model a 3stage cascaded TWT amplifier to support on-going efforts on its design and further optimization. Obtained results are compared with the predictions of the 3D PIC code MAGIC.