等离子体部分填充的波纹慢波结构中电磁波色散特性

 对有限厚环形等离子体层填充的波纹慢波结构中电磁波色散特性进行了分析。研究结果表明，对于ω＞ω_p的高频TM_0n模，模式色散曲线随等离子体密度的增加而上移；ω≤ω_p的低频等离子体模为一系列呈周期变化的密度谱，部分模式能与电子注发生较强的同步互作用。等离子体模的时间增长率随等离子体密度的增加快速增加，而TM_0n模则快速减小或缓慢增加，因此在较高的等离子体密度下，高频模式可能被抑制。

Linear theory analyses on dispersion characteristics of electromagnetic waves in a plasma-part-filled slow-wave structure

The linear dispersion relation of the electromagnetic waves in a plasma-partly-filled slow-wave structure is analyzed and calculated. Dispersion curves of the TM01 is up shift to GHz as the plasma density increases to 8 × 1011 cm-3 with the plasma thickness of 0.2 cm. The result is in good agreement with the experimental result observed by X · Zhai. It is found that a series of low-frequency plasma modes satisfy Floquet theorem in the magnetized plasma-partly-filled slow-wave structure. These modes can interact with relativistic electron beam and the peak-growth rates of some modes are as high as that of TM0n modes. Increasing the plasma density, the peak-growth rate of the plasma mode increases quickly, and becomes greater than that of the TM0n, modes. For the plasma density greater than 1012cm-3, Cerenkov oscillation of low-frequency can be predicted.