Ku波段低磁场返波管振荡器的模拟与实验

Simulation and experiment of Ku-band backward wave oscillator with low magnetic field

摘要:

为了实现高功率微波(HPM)系统小型化，结合传统低磁场相对论返波管振荡器(RBWO)的设计理论，设计一个Ku波段较低磁场的相对论返波振荡器。分析束压、束流、引导磁场等对输出微波的影响，并采用粒子模拟软件(PIC)优化结构。当轴向引导磁场为0.4 T，电子束束压和束流分别为600 kV和7 kA时，得到频率为13.08 GHz，功率为1.0 GW的微波输出。在强流电子束加速器平台上开展实验验证模拟结果：外加磁场0.4 T时，得到平均功率为850 MW、频率13.05 GHz、脉宽24 ns的微波输出。该实验结果为实现较低磁场GW级微波输出打下了良好的基础。

Abstract:

A Ku-band backward wave oscillator with low magnetic field is designed in order to realize the High Power Microwave(HPM) system miniaturization, according to the basic theory of traditional Relativistic Backward-Wave Oscillator(RBWO) with low magnetic field. The effects of beam voltage, beam current and the guiding magnetic field on the output power are analyzed. The structure is optimized by using particle simulation(PIC). A microwaves output power of 1.0 GW with the frequency of 13.1 GHz is obtained under the guiding magnetic field of 0.4 T, the diode voltage of 600 kV and the beam current of 7 kA. The preliminary experiment is performed at low magnetic field condition. Under a guiding magnetic field of 0.4 T, the microwave power of 850 MW with 13.05 GHz frequency and 24 ns pulse width is obtained. The experiment has laid a good foundation to realize the GW microwave output with lower magnetic field.