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Simulations of modern, high current electron beam lithography devices may require modeling of optical components and multiple electron sources that are positioned in an oblique fashion with respect to the main device axis and include counter streaming regions, where two beams are co-located in space while propagating in opposite directions. Modeling such complex multi-beam systems presents different...
Comparisons between predictions of the NRL large signal codes CHRISTINE and TESLA-FW and measurements of small signal gain of NRL's G-Band serpentine waveguide TWT are presented. Results of a sensitivity study of the effects on gain of the circuit dispersion allow us to identify the most critical physical circuit dimensions for TWT design and to quantify required circuit fabrication tolerances.
In a helix traveling wave tube, the interaction between the electron beam and the backward wave can lead to instabilities as BWO (backward wave oscillation) if the beam current is large enough. As the efficient part of the circuit fields varies in the angular direction, a 3D tool is needed to model such a phenomena. The numerical model is presented, with some examples of BWO starting conditions research...
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...
In recent years, many types of Vacuum tubes have been successfully modeled using simulation codes. However, there wasn't a complete solution which is suitable for multi-physics problem and is embedded in various industry standard workflows through integrated design environment which gives access to the entire range of numerical technology. CST STUDIO SUITE® provides engineers and researchers with...
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