变参数Smith-Purcell自由电子激光器的效率
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摘要: 讨论了变参数Smith–Purcell自由电子激光器中电子的一维运动。得到了小信号情况下器件效率的解析式，给出了选取光栅参数的变化依据。在辐射输出波长为1 μm情况下进行了数值模拟计算。结果表明，当光栅参数的变化选取合适时，增加电子与场的相互作用长度，能提高器件的工作效率。
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关键词:
- Smith–Purcell效率 /
- 自由电子激光 /
- 光栅 /
- 变参数 /
- 空间频率
Abstract: The electron 1–D movement for the variable parameter Smith – Purcell FEL is discussed. When the laser operates in state of the low – gain, the analytical expression of the efficiency is derived and a reference formula as how to choose the change rate of the gratting parameter is also given. The numerical simulation results for a radiation output of 1m m ?wavelength are presented. The interaction length between the electrons and the field can be stretched and the efficiency will be enhanced when the change rate is chosed properly.-
Key words:
- smith – purcell effect /
- fel /
- gratting /
- variable parameter /
- space freque
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