Study on injection locked gyrotron with pre-bunched beam
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摘要: 开展了40 kW预群聚注入锁相回旋管的理论与模拟设计。基于全电磁仿真方法完成了预群聚腔的设计，并采用给定场理论对电子束经过预调制腔后的群聚状态进行了计算。采用自洽理论获得了回旋管的自由振荡工作参数，并计算了振荡频率随各种参数变化的规律，由此提出了锁相带宽的要求。采用PIC粒子模拟进行了锁相状态的模拟，得到7 mm漂移距离下锁定增益可达30.5 dB，相应的锁相带宽为20 MHz。如果进一步增长漂移距离或者进一步增大输入功率，锁相带宽还会增大。理论计算和粒子模拟结果表明40 kW级回旋管注入锁相具有良好的可行性。Abstract: A 40 kW injection locked gyrotron is designed based on theoretical calculations and simulations. The interaction structure is formed by two cavities which operate under TE01-TE03 mode pair. The state of the beam across the pre-bunching cavity is calculated with the fixed profile theory, and the operation parameters of the gyrotron under free oscillation state is calculated with the self-consistent theory. The regulation of the oscillation frequency varying with the parameters is achieved, based on which the locking bandwidth is proposed. A PIC code is used for simulating the injection locking state, a gain of 30.5 dB and a locking bandwidth of 20 MHz are achieved under a drifting length of 7 mm. If the drifting length or the input power is increased, the locking bandwidth could be wider. The calculations and simulations show that injection locking of the 40 kW gyrotron is feasible.
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Key words:
- gyrotron /
- injection locking /
- pre-bunching
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图 9 自洽理论计算得到的电子束动量变化、输出功率与效率
Figure 9. Variation of the electronic momentum, output power and efficiency by self-consistent theory
图 10 给定场理论计算得到的输出功率与磁场的关系
Figure 10. Output power versus magnetic field by fixed-profile theory
图 11 频率漂移与磁场波动、电流波动之间的关系
Figure 11. Frequency shifting vs fluctuation of the magnetic field and the beam current
图 12 频率漂移与电压波动、腔体半径变化量之间的关系
Figure 12. Frequency shifting vs fluctuation of the beam voltage and radius of the cavity
图 13 预群聚注入锁定的二维PIC模型
Figure 13. 2-D PIC model of the injection locking with pre-bunched beam
图 14 自由振荡时的输出功率和频谱
Figure 14. Output power and frequency spectrum under free oscillation state
图 15 注入锁定后的功率频谱
Figure 15. Output power and frequency spectrum when injection is locked
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