含有部分填充等离子体柱的螺旋线混合模的理论分析
Study of the hybrid mode in the helix with a partially filled plasma column
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摘要: 导出了含有部分填充等离子体柱的螺旋线中混合模的色散方程,计算出混合模的色散曲线并由此探讨了混合模的形成条件。研究了约束磁场对轴向电场的径向分布的影响。在低约束磁场下轴向电场的径向分布显示场与电子束的耦合显著增强,无聚焦磁场时存在着沿等离子体柱面传播的 TG模。
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关键词:
- 等离子体填充的行波管; 螺旋线; 混合模
Abstract: The dispersion equation of the axial symmetric hybrid mode inside the helix with a partially filled plasma column is derived, its dispersion curves are calculated, and the conditions to form that mode are illustrated. The effect of confining magnetic field on the radial profile of axial electric field is studied. In the situation that the strength of confining magnetic field has been entrusted a practical low value, the calculated radial profile shows much stronger coupling of the filed to the electron beam. In the situation without confining magnetic field, a Trivelpiece-Gould mode propagating along the surface of the plasma column presents. -
G.S. Nusinovich, Y. Camel, T. M. Antonsen, Jr, D. M. Goebel, J. Santoru, Recent progress in the development of plasma-filled traveling-wave tubes and backward-wave oscillators, IEEE Trans. on Plasma Sci., 1998, 26(3), 628-645.[2]S. Kobayashi, T. M. Antonsen, Jr, S. Nusinivich, Linear theory of a plasma loaded, helix type,slow wave amplifier, IEEE Trans. on Plasma Sci., 1998, 26(3), 669-679.[3]A.W. Trivelpiece, Slow Wave Propagation in Plasma Waveguides, San Francisco, San Francisco Press, 1967, 22.[4]陈光,部分填充等离子体的螺旋线电磁特性的理论与实验研究,北京,[硕士论文],北京大学,2001[5]R.E. Collin, Foundations for Microwave Engineering, New York, McGraw-Hill, 1966, 393.[6]A.W. Trivelpiece, R. W. Gould, Space charge waves in cylindrical plasma columns, JAP, 1959,30(11), 1784-1794. -
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