Particle-in-Cell Simulation of a Spatial-Harmonic Magnetron With a Cold Secondary Emission Cathode
Particle-in-Cell Simulation of a Spatial-Harmonic Magnetron With a Cold Secondary Emission Cathode
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DOI：
10.1109/tps.2012.2222934
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发表时间：
2012-11
影响因子：
1.5
通讯作者：
N. N. Esfahani-N.;K. Schunemann
中科院分区：
文献类型：
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作者：
N. N. Esfahani-N.;K. Schunemann
利用CST Particle Studio中嵌入的3-D Particle -in-cell （PIC）代码，对具有冷二次发射阴极的16叶片毫米波空间谐波磁控管（SHM）进行了研究。SHM的模拟是在没有人工射频启动的情况下进行的，也没有对操作模式或要考虑的谐波数量进行限制性假设。因此，在我们的模拟中，电磁振荡是由噪声自然产生的。给出了随时间演化的空间电荷模拟和单频射频振荡的逐渐形成过程。饱和时空间电荷分布的检查揭示了两种不同的空间电荷分布的存在，这取决于一次发射电流的量。这个电流被用来模拟一个轰击电流，它被用来初始化冷阴极。结果表明，小一次发射密度导致饱和时空间电荷的非周期性分布，这与先前报道的SHMs空间电荷分布一致。仿真得到的电流、功率和效率与实验结果吻合良好。
A 16-vane millimeter-wave spatial-harmonic magnetron (SHM) with a cold secondary emission cathode is examined by the use of a 3-D particle-in-cell (PIC) code embedded in CST Particle Studio. Simulations of the SHM are performed without artificial RF priming and without assuming restrictive assumptions on the mode of operation or on the number of harmonics to be considered. Thus, in our simulations, the electromagnetic oscillations grow naturally from noise. Time-evolved space-charge simulations and gradual formation of a single-frequency RF oscillation are presented. Examination of space-charge profiles at saturation time reveals the presence of two different space-charge distributions that depend on the amount of primary emission current. This current is employed to model a bombarding current, which is used to initialize the cold cathode. It is shown that a small primary emission density results in nonperiodic distribution of space charge at saturation time, which is in accordance with the previously reported space-charge distribution in SHMs. The simulated current, power, and efficiency indicate good correlation with the experimental results.