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Magnetic Field Tapering Approaches for Backward-Wave Oscillation Suppression in Helix Traveling-Wave Tubes
Publikationstyp
Journal Article
Date Issued
2018-06
Sprache
English
Institut
TORE-URI
Volume
65
Issue
6
Start Page
2236
End Page
2242
Citation
IEEE Transactions on Electron Devices 6 (65): 2236-2242 (2018-06)
Publisher DOI
Scopus ID
Two magnetic field tapering concepts for the suppression of backward-wave oscillations in helix traveling-wave tubes (TWTs) are presented. Therefore, the beam-wave interaction in a homogeneous helix section is modified. Increasing the field strength reduces the beam diameter and consequently the beam-wave coupling, while an additional offset in the focusing field alters the synchronism between both. The theoretical background is introduced and results from a 1-D small-signal and a 3-D particle-in-cell code are presented and compared. Furthermore, a concept to apply the suppression techniques to a complete TWT is presented, and the influence on the amplifier output characteristics is analyzed.