等离子体部分填充的波纹慢波结构中电磁波色散特性
Linear theory analyses on dispersion characteristics of electromagnetic waves in a plasmapartfilled slowwave structure
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摘要: 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＞ωp的高频TM0n模，模式色散曲线随等离子体密度的增加而上移；ω≤ωp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TM0n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。Abstract: The linear dispersion relation of the electromagnetic waves in a plasmapartfilled slowwave structure is analyzed and calculated. Dispersion curves of the TM01 is up shift to 1GHz as the plasma density increases to 8×1011cm-3 with the plasma thickness of 0.2cm. The result is in good agreement with the experimental result observed by X·Zhai. It is found that a series of lowfrequency plasma modes satisfy Floquet theorem in the magnetized plasmapartfilled slowwave structure. These modes can interact with relativistic electron beam and the peakgrowth rates of some modes are as high as that of TM0n modes. Increasing the plasma density, the peakgrowth rate of the plasma mode increases quickly, and becomes greater than that of the TM0n modes. For the plasma density greater than
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