Design of a Three-stage Depressed Collector for 220 GHz Travelling Wave Tubes

In this paper, a three-stage depressed collector is designed to improve the overall efficiency of a 220 GHz sheet beam travelling wave tube (SB-TWT). The collection efficiency and back-streaming current are two key indicators for a depressed collector. By analyzing the position and energy distributi...

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Bibliographic Details
Main Authors: Tang, Jiawei, Shu, Guoxiang, Xie, Xinlun, Pan, Huaxing, Ma, Shaochen, Li, Mingze, Liu, Siyuan, He, Wenlong
Format: Conference Proceeding
Language:English
Subjects:
Computational modeling
Computer simulation
Electrodes
Electron beams
Shape
Traveling wave tubes
Voltage
Online Access:Request full text
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Summary:In this paper, a three-stage depressed collector is designed to improve the overall efficiency of a 220 GHz sheet beam travelling wave tube (SB-TWT). The collection efficiency and back-streaming current are two key indicators for a depressed collector. By analyzing the position and energy distribution of the spent electron beam observed at the end of the high-frequency system, the collector shape and electrode voltage are designed by using Computer Simulation Technology (CST). The optimized voltages applied to the three electrodes are −26779 V, −27937 V, and −29950 V, respectively. To simulate the performance of the collector in a more realistic situation, the Furman model is used as the secondary electron emission model in the design. CST Simulation results show that the collection efficiency is 96.1% and 95.2%, and the back-streaming rate is 0.008% and 0.02% for the case without and with considering secondary electrons, respectively.
ISSN:2831-5804
DOI:10.1109/PIERS62282.2024.10618163