速调管放大器大漂移管尺寸输入腔的3维分析与模拟
Three dimensional analysis and simulation of wide-aperture input cavities for klystron amplifier
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摘要: 设计了3种耦合孔结构的大漂移管输入腔，分析比较了其冷腔场分布以及直流电子束通过输入腔间隙后的束流调制情况。计算结果表明：在工作模式下，开单扇形耦合孔和环形孔比开双扇形耦合孔的间隙场均匀；在大尺寸漂移管条件下，采用环形耦合孔输入腔的品质因数比单扇形耦合孔输入腔的小，环形耦合孔输入腔与微波注入波导匹配较好；在相同注入微波功率的情形下，环形耦合孔输入腔对种子源微波的吸收比单扇形耦合孔输入腔好且调制电流更大。Abstract: The wide-aperture input cavities with three coupling structures are addressed, and the field distributions of the cold cavities and beam modulation after the electron beams propagate through the input cavity gaps are analyzed. The results show that the fields with single scallop coupling hole and annular coupling hole in operation mode are more uniform than that with double-scallop coupling hole. For large scale drift tubes, the loaded quality factors of the input cavity with annular coupling hole are lower than those with single scallop coupling hole, and the cavity with annular coupling hole matches well with input waveguides. With the same input microwave power, the beam modulation and the power absorption from driving microwaves in the annular coupling hole input cavity are better than
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Key words:
- relativistic klystron amplifier /
- input cavity /
- coupling hole /
- high frequency signal
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