Influence of quality factor on operating mode of TM<sub>02</sub> mode relativistic backwave oscillator

姓名
邮箱
手机号码
标题
留言内容
验证码

Abstract

The mode competition in an overmoded relativistic backward wave oscillator is studied through theoretical analysis and three-dimensional particle-in-cell simulation in this work. Based on the quality factor and coupling impedance, the mode selection for a TM ₀₂mode backward wave oscillator is achieved, and its output power and magnetic field strength are optimized in the simulation. The quality factor is related to the group velocity and end reflection of each mode. The dispersion curves of some non-axisymmetric modes are very close, and the group velocities are basically equal. Therefore, the end reflection needs considering to distinguish between the quality factors of different modes. In frequency domain simulation, analyzing the quality factor of each mode by using the S ₁₁parameter curve can avoid calculating the end reflection. The three-dimensional simulation results show that the coupling impedance and quality factor jointly affect the operating mode. When the coupling impedance advantage of the working mode is not obvious, changing the resonant frequency of the high-frequency structure can affect the beam-wave interaction process, thereby changing the excitation mode. When the advantage is obvious, the beam-wave interaction of the excitation mode will not be destroyed by the resonant mode, and other modes of microwave output mainly come from the conversion of the same frequency modes. Due to the constant dispersion curve, the effect of resonance on the mode is essentially the effect of the quality factor on the mode dominated by the end reflection. The insensitive parameters and the electron beam radius obtained from the simulation are used as the optimal parameters, and the automatic optimization algorithm is used in combination with the two-dimensional simulation to perform multi-objective optimization design in the above device. The final output power of the backward wave oscillator reaches 534 MW, with an efficiency of 23.64%, an increase of 221.7% compared with the efficiency of the original device. The device operating mode remains stable, with a power ratio of TM ₀₂mode reaching 94.95%.

Keywords:

Authors and contacts

Corresponding author:Zhai Yong-Gui,zhaiyg@xjtu.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 12175176, 12235013).

FullText HTML: translate this paragraph

References

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]

Cited By

DownLoad: Full-Size Img PowerPoint

序号	L_r1/mm	L_r2/mm	L_b/mm	r_r1/mm	r_r2/mm	r_a/mm	r_b/mm	r_c/mm
1	3.0	6.0	2.0	11.0	14.0	9.2	9.2	10.8
2	6.7	7.0	9.0	14.1	14.1	10.8	9.2	10.8

DownLoad: CSV

序号	L/mm	r_b/mm	TM₀₂功率占比/%	主要竞争模式及占比/%
1	7.0	7.0	35.27	TM₀₁	24.36
2	7.5	7.0	42.09	TE₄₁	27.92
3	8.0	7.0	73.69	TE₀₁	13.91
4	8.5	7.0	33.24	TE₄₁	30.12
5	9.0	7.0	46.75	TE₄₁	32.53
6	10.0	7.0	53.70	TM₀₁	19.66
7	11.0	7.0	54.95	TM₀₁	22.72

DownLoad: CSV

	模式
	TM₀₂	TE₄₁	TM₀₁	TE₀₁	其他
功率占比/%	46.75	32.53	19.09	1.52	0.01
谐振频率f/GHz	26.00	25.98	26.09	25.95	—
Q	23.32	6493.75	783.48	462.57	—

DownLoad: CSV

	模式
	TM₀₂	TE₄₁	TM₂₁
工作频率/GHz	26.02	25.83	24.57
谐振频率f/GHz	26.00	25.97	24.38
r_out/mm	10.8	10.6	10.7
L/mm	9.0	11.0	7.0
Q	3610.8	3935.6	2890.6

DownLoad: CSV

参数	初始值	变化范围	精度
L/mm	7.0	[5.0, 11.0]	0.1
r_e/mm	16.5	[14.0, 20.0]	0.1
r_b/mm	7.0	[6.4, 7.6]	0.1
L_B/mm	125.0	[100.0, 160.0]	0.1
B/T	2.8	[0.4, 3.0]	0.01

DownLoad: CSV

参数	L/mm	r_e/mm	r_b/mm	L_B/mm	B/T
优化结果	6.5	15.5	7.2	118.1	1.42

DownLoad: CSV

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]

[1]	Liu Wei, Jia Qing, Zheng Jian.Wavefront distortion and compensation for weakly relativistic vortex beams propagating in plasma. Acta Physica Sinica, 2024, 73(5): 055203.doi:10.7498/aps.73.20231635
[2]	Yang Wen-Yuan, Dong Ye, Sun Hui-Fang, Yang Yu-Lin, Dong Zhi-Wei.Physical analysis and numerical simulations of ultra wideband plasma relativistic microwave noise amplifier. Acta Physica Sinica, 2023, 72(5): 058401.doi:10.7498/aps.72.20222061
[3]	Wang Yao-Ting, Luo Lan-Yue, Li He-Ping, Jiang Dong-Jun, Zhou Ming-Sheng.Non-equilibrium transport of charged particles in a wall-confined decaying plasma under an externally applied electric field. Acta Physica Sinica, 2022, 71(23): 232801.doi:10.7498/aps.71.20221431
[4]	Yang De-Wen, Chen Chang-Hua, Shi Yan-Chao, Xiao Ren-Zhen, Teng Yan, Fan Zhi-Qiang, Liu Wen-Yuan, Song Zhi-Min, Sun Jun.Investigation of an X band high efficiency klystron-like relativistic backward wave oscillator. Acta Physica Sinica, 2020, 69(16): 164102.doi:10.7498/aps.69.20200434
[5]	Yang Wen-Yuan, Dong Ye, Sun Hui-Fang, Dong Zhi-Wei.Competitions among modes in magnetically insulated transmission line oscillator. Acta Physica Sinica, 2020, 69(19): 198401.doi:10.7498/aps.69.20200383
[6]	Wang Hong-Guang, Liu Peng-Fei, Zhang Jian-Wei, Li Yong-Dong, Cao Yi-Bing, Sun Jun.Particle-in-cell simulation on effect of collector outgassing on relativistic backward oscillator. Acta Physica Sinica, 2019, 68(18): 185203.doi:10.7498/aps.68.20190554
[7]	Huang Li-Ping, Hong Bin-Bin, Liu Chang, Tang Chang-Jian.Study on 220 GHz third harmonic photonic band gap cavity gyrotron oscillator. Acta Physica Sinica, 2014, 63(11): 118401.doi:10.7498/aps.63.118401
[8]	Chen Mao-Lin, Xia Guang-Qing, Mao Gen-Wang.Three-dimensional particle in cell simulation of multi-mode ion thruster optics system. Acta Physica Sinica, 2014, 63(18): 182901.doi:10.7498/aps.63.182901
[9]	Chen Zai-Gao, Wang Jian-Guo, Wang Yue, Zhu Xiang-Qin, Zhang Dian-Hui, Qiao Hai-Liang.Numerical simulation of generation and radiation of super-radiation from relativistic backward wave oscillators. Acta Physica Sinica, 2014, 63(3): 038402.doi:10.7498/aps.63.038402
[10]	Chen Zai-Gao, Wang Jian-Guo, Wang Yue, Qiao Hai-Liang, Guo Wei-Jie, Zhang Dian-Hui.Optimal design of high-power microwave source based on particle simulation and genetic algorithms. Acta Physica Sinica, 2013, 62(16): 168402.doi:10.7498/aps.62.168402
[11]	Wang Hui-Hui, Liu Da-Gang, Meng Lin, Liu La-Qun, Yang Chao, Peng Kai, Xia Meng-Zhong.The numerical study of full three-dimensional particle in cell/Monte Carlo with gas ionization. Acta Physica Sinica, 2013, 62(1): 015207.doi:10.7498/aps.62.015207
[12]	Wang Hui-Hui, Meng Lin, Liu Da-Gang, Liu La-Qun, Yang Chao.Numerical optimization study of PIC/PSO for RBWO. Acta Physica Sinica, 2013, 62(13): 138401.doi:10.7498/aps.62.138401
[13]	Wang Yu, Chen Zai-Gao, Lei Yi-An.Simulation of 0.14 THz relativistic backward-wave oscillator filled with plasma. Acta Physica Sinica, 2013, 62(12): 125204.doi:10.7498/aps.62.125204
[14]	Du Chao-Hai, Li Zheng-Di, Xue Zhi-Hao, Liu Pu-Kun, Xue Qian-Zhong, Zhang Shi-Chang, Xu Shou-Xi, Geng Zhi-Hui, Gu Wei, Su Yi-Nong, Liu Gao-Feng.Research on the mode competition in a w-band lossy ceramic-loaded gyrotron backward-wave oscillator. Acta Physica Sinica, 2012, 61(7): 070703.doi:10.7498/aps.61.070703
[15]	Li Wei, Liu Yong-Gui.Simulation investigation of the 2 mode operating tunable relativistic magnetron with axial radiation. Acta Physica Sinica, 2011, 60(12): 128403.doi:10.7498/aps.60.128403
[16]	Liu Yang, Gong Hua-Rong, Wei Yan-Yu, Gong Yu-Bin, Wang Wen-Xiang, Liao Fu-Jiang.An effective method for suppressing the mode competition in a rectangular cavity loaded with photonic crystals. Acta Physica Sinica, 2009, 58(11): 7845-7851.doi:10.7498/aps.58.7845
[17]	Li Xiao-Ze, Wang Jian-Guo, Tong Chang-Jiang, Zhang Hai.PIC-MCC simulations on characteristics of RBWO filled with different gases. Acta Physica Sinica, 2008, 57(7): 4613-4622.doi:10.7498/aps.57.4613
[18]	.Stimulated Raman scattering mode competition in C6H12 under different pump wavelength. Acta Physica Sinica, 2007, 56(12): 6994-6998.doi:10.7498/aps.56.6994
[19]	Xu Hui, Sheng Zheng-Ming, Zhang Jie.Relativistic effects on resonance absorption in laser-plasma interaction. Acta Physica Sinica, 2006, 55(10): 5354-5361.doi:10.7498/aps.55.5354
[20]	Gong Yu-Bin, Zhang Zhang, Wei Yan-Yu, Meng Fan-Bao, Fan Zhi-Kai, Wang Wen-Xiang.Simulation of pulse shortening phenomena in high power microwave tube using PIC method. Acta Physica Sinica, 2004, 53(11): 3990-3995.doi:10.7498/aps.53.3990

Catalog

Vol. 73, Issue 3 - 2024-02-05

Metrics

Abstract views:1660
PDF Downloads:60
Cited By:0

Search

Article