Analysis of the axial electric field in a plasma-loaded-helix travelling wave tube
Xie Hong-Quan(谢鸿全)a) and Liu Pu-Kun(刘濮鲲)b)
a School of Science, Southwest University of Science and Technology, Mianyang 621002, China; b Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China
Abstract A helix type slow wave structure filled with plasma is immersed in a strong longitudinal magnetic field. Taking into account the effect of the plasma and the dielectric, the system is separated radially into three regions. By means of the sheath model and Maxwell equation, the distribution of the electromagnetic field is established. Using the boundary conditions of each region, the dispersion relation of the slow wave structure is derived. The trend of change for the radial profile of the axial electric field is analysed respectively in different plasma densities, plasma column radius and dielectric constant by numerical computation. Some useful results are obtained on the basis of the discussion.
Received: 04 March 2006
Revised: 27 March 2006
Accepted manuscript online:
Fund: Project supported by the
National Natural Science Foundation of China (Grant No 10347009) and
the Science Foundation of Education Bureau of Sichuan Province,
China (Grant No 2003B019).
Cite this article:
Xie Hong-Quan(谢鸿全) and Liu Pu-Kun(刘濮鲲) Analysis of the axial electric field in a plasma-loaded-helix travelling wave tube 2006 Chinese Physics 15 2042
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