渐变慢波结构的太赫兹过模表面波振荡器

模拟研究了一种在均匀慢波结构后增加渐变慢波结构段的太赫兹过模表面波振荡器,获得了输出功率和模式纯度的显著提高。首先根据S参数方法,研究分析了这种复合高频结构中TM01模的谐振特性。然后采用2.5维PIC(Particle-in-cell)软件UNIPIC,模拟研究了振荡器输出性能随渐变慢波结构周期数的变化关系。结果表明：随着周期数的增加,输出太赫兹波中的TM02和TM03等高次模成分降低,TM01模的功率比例增大至80%以上；选择合适长度的渐变慢波结构,能使得器件输出功率增大50%。

Abstract

A terahertz overmoded surface wave oscillator (SWO) with tapered slow wave structures (SWS) added after the uniform SWSs is investigated, and the notable enhancement of output power and mode purity is obtained. At first, the resonant characteristics of the multiple high frequency structure are studied and analyzed by using the S-parameters method. Then a 2.5 dimensional particle-in-cell (PIC) code UNIPIC is employed to simulate and research the variation relations between the output performance of the oscillator and the length of tapered SWSs. The results show that the power ratio of TM01 mode in the output terahertz wave increases to be over 80% with the increase of period number, while ratios of TM02 and TM03 higher modes are suppressed efficiently; and the output power of the oscillator with appropriate length of tapered SWSs is 50% more than that from SWO with uniform SWSs.

参考文献

[1] Booske J H, Dobbs R J, Joye C D, et al. Vacuum electronic high power terahertz sources［J］. IEEE Trans Terahertz Sci Techn, 2011, 1(1): 54-75.

[2] Bratman V L, Denisov G G, Ofitserov M M, et al. Millimeter-wave HF relativistic electron oscillators［J］. IEEE Trans Plasma Sci, 1987, PS-15(1): 2-15.

[3] Zhang H, Shu T, Ju J C, et al. Gigawatt-class radiation of TM01 mode from a Ku-band overmoded Cerenkov-type high-power microwave generator［J］. IEEE Trans Plasma Sci, 2014, 42(6): 1567-1572.

[4] Zhu J, Shu T, Zhang J, et al. Experimental investigation of a Ka band high power millimeter wave generator operated at low guiding magnetic field［J］. Phys Plasmas, 2011, 18: 053101.

[5] 陈洪斌, 周传明, 胡林林, 等. 0.14THz 返波管器件［J］. 强激光与粒子束, 2010, 22(4): 865-869. (Chen Hongbin, Zhou Chuanming, Hu Linlin, et al. 0.14 THz backward wave oscillator. High power Laser and Particle Beams, 2010, 22(4): 865-869)

[6] Wang G Q, Wang J G, Tong C J, et al. A repetitive 0.14 THz relativistic surface wave oscillator ［J］. Phys Plasmas, 2013, 20: 043105.

[7] 王光强, 王建国, 李爽, 等. 0.34THz大功率过模表面波振荡器研究［J］. 物理学报, 2015, 64: 050703 (Wang Guangqiang, Wang Jianguo, Li Shuang, et al. Study on 0.34THz overmoded surface wave oscillator. Acta Physica Sinica, 2015, 64: 050703)

[8] Bratman V L, Fedotov A E, Makhalov P B, et al. Design and numerical analysis of W-band oscillators with hollow electron beam［J］. IEEE Trans Electron Device, 2014, 61(6): 1795-1799

[9] Zhang D, Zhang J, Zhong H H, et al. Analysis of the mode composition of an X-band overmoded O-type Cerenkov high-power microwave oscillator［J］. Phys Plasmas, 2012, 19: 103102.

[10] Xiao R Z, Tan W B, Li X Z, et al. A high-efficiency overmoded klystron-like relativistic backward wave oscillator with low guiding magnetic field［J］. Phys Plasmas, 2012, 19: 093102.

[11] 王光强, 王建国, 李爽, 等. 0.14THz过模表面波振荡器的模式分析［J］. 物理学报, 2013, 65: 150701. (Wang Guangqiang, Wang Jianguo, Li Shuang, et al. Mode analysis of 0.14 THz overmoded surface wave oscillator. Acta Physica Sinica, 2013, 65: 150701)

[12] 王光强, 王建国, 李爽, 等. 过模表面波振荡器输出太赫兹波模式的影响因素分析［J］. 真空科学与技术学报, 2014, 34(10): 1059-1065. (Wang Guangqiang, Wang Jianguo, Li Shuang, et al. Simulation and optimization of terahertz-wave output from overmoded surface wave oscillator. Chin J Vacuum Sci Technol, 2014, 34(10): 1059-1065)

[13] Zhang D, Zhang J, Zhong H H, et al. Purification of the output modes of overmoded relativistic backward wave oscillators［J］. Phys Plasmas, 2012, 19: 103102.

[14] 张军, 钟辉煌. 高功率O型慢波器件的纵向模式选择研究［J］. 物理学报, 2005, 54(1): 206-210. (Zhang Jun, Zhong Huihuang. Investigation on longitudinal mode selection in O-type HPM devices. Acta Physica Sinica, 2005, 54(1): 206-210)

[15] 葛行军, 陈宇, 钱宝良, 等. O型同轴慢波器件的纵向模式选择研究［J］. 电波科学学报, 2008, 23(6): 1111-1114. (Ge Xingjun, Chen Yu, Qian Baoliang, et al. Selection of longitudinal mode for O-type coaxial slow-wave devices. Chin J Radio Sci, 2008, 23(6): 1111-1114)

[16] Wang J G, Zhang D H, Liu C L, et al. UNIPIC code for simulations of high power microwave devices［J］. Phys Plasmas, 2009,16: 033108.

王光强, 王建国, 李爽, 曾鹏, 张黎军, 陈再高. 渐变慢波结构的太赫兹过模表面波振荡器[J]. 强激光与粒子束, 2016, 28(3): 033103. Wang Guangqiang, Wang Jianguo, Li Shuang, Zeng Peng, Zhang Lijun, Chen Zaigao. Terahertz surface wave oscillator with tapered slow-wave structure[J]. High Power Laser and Particle Beams, 2016, 28(3): 033103.

渐变慢波结构的太赫兹过模表面波振荡器

关于本站 Cookie 的使用提示

全站搜索

渐变慢波结构的太赫兹过模表面波振荡器

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索