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Three-dimensional particle-in-cell analysis of beam-wave interaction was carried out in MAFIA for a multi-section severed helix traveling-wave tube. The severloss was modeled by considering the carbon-coated helix-support rods as lossy dielectric rods having finite conductivity as a step function corresponding to the circuit attenuation constant along the taper-profiled loss in the sever-loss region...
A methodology for the simulation of coaxial RF coupler of a helix traveling-wave tube was developed including the effects of helix-to-coupler discontinuity and the RF match at the taper-profiled sever-loss region. The attenuator at the sever-loss was modeled by considering the carbon-coated helix-support rods as lossy dielectric rods having finite conductivity as a step function corresponding to the...
Attenuator-coated helix-support rods in a helical slow-wave structure were modeled by considering them to be made up of lossy dielectric material having equivalent bulk conductivity. The same conductivity values were used in 3D HFSS modeling of the helical slow-wave structure having the helix supported by three such support rods inside a metal envelope, and the attenuation constant of the structure...
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