Magnetic Field Tapering Approaches for Backward-Wave Oscillation Suppression in Helix Traveling-Wave Tubes

被引：11
|
作者：
Haegermann, Moritz [1 ]
Birtel, Philip [2 ]
Meyne, Sascha [1 ]
Safi, Djamschid [1 ]
Jacob, Arne F. [1 ]
机构：
[1] Tech Univ Hamburg, Inst Hochfrequenztech, D-21073 Hamburg, Germany
[2] Thales Elect Syst GmbH, D-89073 Ulm, Germany
来源：
IEEE TRANSACTIONS ON ELECTRON DEVICES | 2018年 / 65卷 / 06期
关键词：
Backward-wave oscillation (BWO); BWO suppression; helix traveling-wave tube (TWT);
D O I：
10.1109/TED.2018.2810501
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
引用
收藏
页码：2236 / 2242
页数：7
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