Publisher DOI: 10.1109/TED.2018.2810501
Title: Magnetic Field Tapering Approaches for Backward-Wave Oscillation Suppression in Helix Traveling-Wave Tubes
Language: English
Authors: Hägermann, Moritz  
Birtel, Philip 
Meyne, Sascha 
Safi, Djamschid  
Jacob, Arne 
Issue Date: Jun-2018
Source: IEEE Transactions on Electron Devices 6 (65): 2236-2242 (2018-06)
Abstract (english): 
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.
ISSN: 0018-9383
Journal: IEEE transactions on electron devices 
Institute: Hochfrequenztechnik E-3 
Document Type: Article
Project: Vollständig kaskadierte Simulation von schmalbandigen Phänomenen und Asymmtrien in Wanderfeldröhren 
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