中文摘要：

研究了离子通道的产生背景及物理机制，利用电磁场理论导出了离子通道的聚束条件和通道半径所满足的方程，并对各区域的相对介电常数作了分析．同时，针对离子通道的动态特性，对所导出的电子振荡运动方程作了定性的讨论．

英文摘要：

A relativistic electron beam transmitting in a cold and uniform plasma column is studied. The research background and the physical regime of ion channel is presented. By means of the electromagnetic field theory, the condition of the electron beam focusing and the equation of the ion channel radius are derived. The relative dielectric constants in each region are analyzed. In addition, the ion channel in motion is analyzed and the equation of motion to an oscillatory electron is derived. Some discussions are given on the basis of the equation.