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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.
Coupled cavity TWT performance has been modeled using 1D (CHIRISTINE-CC) and 2D (TESLA-CC) approaches. The codes' predictions have been compared in detail for regimes for which application of both codes is valid. It was found that the level of code agreement depends primarily on beam current (beam perveance). The codes predict almost identical gain for the small current regime while differences in...
We formulate and solve a set of equations that model the effects of reflections from an arbitrary number of circuit discontinuities in a traveling-wave tube (TWT) operating under small-signal conditions. Applying this model to a case in which the discontinuities represent a series of small random pitch variations due to fabrication errors in a helix TWT, we find that reflections may significantly...
We address issues related to unwanted modes in a sheet-beam coupled-cavity structure. First, we establish estimates of gain for all modes. Then we evaluate methods of selectively suppressing unwanted modes.
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