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Chinese Physics, 2006, Vol. 15(9): 2042-2045    DOI: 10.1088/1009-1963/15/9/025
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

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.
Keywords:  helix travelling wave tube      plasma      axial electric field  
Received:  04 March 2006      Revised:  27 March 2006      Accepted manuscript online: 
PACS:  62.60.+v (Acoustical properties of liquids)  
  43.35.Bf (Ultrasonic velocity, dispersion, scattering, diffraction, and Attenuation in liquids, liquid crystals, suspensions, and emulsions)  
  61.20.-p (Structure of liquids)  
  65.20.-w (Thermal properties of liquids)  
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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