Results from a particle-in-cell simulation study of L3Harris CWM-75 kW are presented; the continuous wave cooker magnetron typically operates at 18 kV, 5 A, 1900 G, 896–929 MHz. The startup process of the device has been simulated in 3D by using the PIC code VSim. The startup behavior was examined with (1) no priming, (2) RF priming, and (3) cathode modulation. Under no priming, the simulated device failed to oscillate in a simulation time of 1000 ns. Oscillations were achieved with both RF priming (150 ns) and cathode modulation (180 ns). Half (∼40 kW) of the device’s typical operating power at a frequency of 915 MHz, the device’s π-mode frequency, was used for the RF priming, and the priming was active only during the first 50 ns of the simulation. The device then oscillated later, but oscillation soon failed as the spokes collapsed. Continuous cathode modulation was also performed at 915 MHz with stable oscillation after 180 ns. A method for analyzing the electron device physics during the magnetron startup was developed by examining time-dependent particle distribution profiles in r and φ. These results provide insight into the conditions in the electron hub that lead to oscillation, particularly the azimuthal velocity distribution where the distribution shows a clear low or negative velocity prior to the start of oscillation.

中文翻译：

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利用电子种群分析对工业磁控管进行粒子模拟

给出了L3Harris CWM-75 kW的单元内粒子模拟研究的结果；连续波炊具的磁控管通常在18 kV，5 A，1900 G，896-929 MHz的频率下工作。通过使用PIC代码VSim在3D中模拟了设备的启动过程。使用（1）无启动，（2）RF启动和（3）阴极调制检查了启动行为。在没有启动的情况下，仿真设备在1000 ns的仿真时间内无法振荡。通过射频启动（150 ns）和阴极调制（180 ns）均可实现振荡。在915 MHz的频率（即设备的π模式频率）下，设备典型工作功率的一半（约40 kW）用于RF激励，该激励仅在模拟的前50 ns内有效。该设备随后发生振荡，但随着辐条塌陷，振荡很快就失败了。还在180 ns后以915 MHz的频率稳定振荡地进行了连续阴极调制。通过检查r和φ中随时间变化的粒子分布曲线，开发了一种用于分析磁控管启动过程中电子设备物理特性的方法。这些结果提供了对电子毂中导致振荡的条件的了解，尤其是方位角速度分布，其中在开始振荡之前，该分布显示出明显的低或负速度。