Analysis of the axial electric field in a plasma-loaded-helix travelling wave tube

• 来源期刊: 中国物理（英文版）
• 关键词: helix travelling wave tube plasma axial electric field
• 年，卷（期）: 2006,（9）
• 页码范围: 2042-2045
• 页数: 4页
• 语种: 英文

摘要

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.