Suppression of backward–wave oscillation by filter helix methods

@article{Siegman1955SuppressionOB,
  title={Suppression of backward\&\#8211;wave oscillation by filter helix methods},
  author={Anthony E. Siegman and H. R. Johnson},
  journal={IRE Transactions on Electron Devices},
  year={1955},
  volume={2},
  pages={20-31}
}
An experimental study has been made of the filter helix properties of a periodically loaded helix, using a special traveling-wave tube. The filter helix is shown to possess filter-like frequency pass bands and stop bands and a phase velocity characteristic such that forward- and backward-wave phase velocities are separated, making the filter helix a useful circuit for traveling-wave amplification at high ka (ratio of helix circumference to free space wavelength) without danger of backward-wave… 

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References

Helix Impedance Measurements Using an Electron Beam

Impedance measurements made on a tape helix with an electron beam are described. Curves showing the measured impedances of the fundamental and first backward space‐harmonic components of the mode