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| Numerical Analysis of the Field in Helix Traveling Wave Tube |
| Hu Yu-lu; Yang Zhong-hai; Li Bin; Li Jian-qing; Huang Tao; Jin Xiao-lin; Liang Xian-pu |
| Vacuum Electronics National Lab, University of Electronic Science and Technology of China, Chengdu 610054, China |
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Abstract The field in helix TWT (Traveling Wave Tube) is studied with numerical analysis. By Numerical field analysis, neglected in the theory’s, the phenomenon is that, the master and slave face setting decides the wave propagation direction, and the helix rotation decides the field’s rotation. Also, the cross-section distribution infection in helix with different rods and vanes outsides of helix are also studied. The field cross-section distribution changes very small, almost with the Bessel function. But the impedance changes much because of the electromagnetic energy re-distribution in rods or vanes. On the other hand, accurate spatial harmonious impedance can be obtained by the spatial harmonious field numerical analysis, especially the mostly used spatial harmonious wave, the 0 and -1 spatial harmonious wave. Above this, the accuracy of the forward and backward beam-wave interaction can be improved.
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Received: 16 June 2009
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Corresponding Authors:
Hu Yu-lu
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2010, Vol. 32 
