中文摘要：

考虑束-离子通道边界上等离子体电子可能发生的扰动，导出了TM模本征方程的理论式．通过对理论结果的数值模拟计算，在阶跃边界情况下将束-离子通道与一般介质波导的电磁关系进行了比较，发现束-离子通道可以通过改变等离子体频率来控制其工作模式．分析对照扰动电荷边界与阶跃边界对束-离子通道电磁模式的影响，观察到在扰动电荷边界情况下，束-离子通道在低频区域（ω〈ωp，ωp为等离子体频率）内截止频率显著提高，并在高频区域（ω〉ωp）内出现了新的电磁模式．研究结果对离子通道激光（ICL）和离子通道电子回旋脉塞（ICECM）的设计提供重要的理论依据．

英文摘要：

Considering the disturbance of the plasma electrons at the beam-ion channel boundary, the eigen-equation of TM mode has been derived. On the basis of comparing the electromagnetic characteristics of the beam-ion channel with a traditional medium waveguide for the condition of a step-boundary defined in this paper, the numerical simulation results show that by changing the plasma frequency one can control the electromagnetic working mode in ion channel. Analyzing the influence of the disturbed charge boundary and the step-boundary on electromagnetic mode in the beam-ion channel, one can find that the cut-off frequency of the beam-ion channel have increased in the low frequency range effectively （ ω 〈 ωp, ωp is the plasma frequency） and some new electromagnetic modes appear in the high frequency range （ ω 〉 ωp ） with the disturbed charge boundary. These findings can provide an important theoretical basis for the design of the ion channel electronics cyclotron maser （ICECM） and the ion channel laser （ICL） .