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论文对0.34 THz大功率过模表面波振荡器进行了模拟设计和初步实验研究. 针对高过模比(D/λ ≈ 6.8)慢波结构, 根据小信号理论选择了合适的慢波结构尺寸和电子束距壁距离, 实现了器件在表面波TM01模的π点附近谐振. 根据PIC模拟结果, 表面波振荡器可以实现频率和功率分别为0.34 THz和22.8 MW的太赫兹波输出. 采用微细电火花加工技术完成了不锈钢慢波结构的一体化精细加工, 并基于小型化脉冲功率驱动源搭建了实验装置. 初步的实验结果表明, 在电子束电压和电流分别约为420 kV和3.1 kA时, 0.34 THz大功率过模表面波振荡器输出脉冲的频率范围为0.319–0.349 THz, 辐射功率不小于250 kW, 脉宽约为2 ns. 最后分析讨论了实验输出功率与模拟结果相差较大的原因, 为表面波振荡器的性能改善奠定了基础.The simulation design and preliminary experiment on a 0.34 THz large-power overmoded surface wave oscillator are presented in this paper. For the slow wave structure (SWS) with large overmoded ratio (D/λ ≈ 6.8), a small signal theory is derived for appropriate dimensions of SWS and gap between electron beam and SWS, and makes the device oscillate near the π point of surface wave at TM01 mode. PIC (particle in cell) simulation results show that this SWO (small wave oscillation) can genetate the terahertz wave with frequency and output power of 0.34 THz and 22.8 MW, respectively. SWS with stainless steel is integrally and precisely fabricated by employing mirco-EDM technology, and the experimental setup is built based on a miniaturized pulse power driving source. Results of preliminary experiment and diagnostics show that a terahertz pulse is radiated at a frequency range of 0.319–0.349 THz, a power of no less than 250 kW, and a pulse duration of about 2 ns at beam voltage of about 420 kV and beam current of about 3.1 kA. Finally, the reason for discrepancy between the measured power and the simulation result is analyzed and discussed, laying the foundation for the performance improvement of terahertz surface wave oscillator.
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Keywords:
- terahertz /
- surface wave oscillator /
- overmoded /
- slow wave structure
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[16] Li X Z, Wang G Q, Wang J G, Tong C J, Wang X F, Song Z M, Li S, Lu X C 2013 High Power Laser and Particle Beams 25 451 (in Chinese) [李小泽, 王光强, 王建国, 童长江, 王雪锋, 李爽, 陆希成 2013 强激光与粒子束 25 451]
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[21] Wang J G, Zhang D H, Liu C L, Li Y D, Wang Y, Wang H G, Qiao H L, Li X Z 2009 Phys. Plasmas 16 033108
[22] Li S, Wang G Q, Tong C J, Wang X F 2013 Proceedings of Cross Strait Quad-Regional Radio Science and Wireless Technology Conferenece Chengdu, China, July 21-25 2013 p408
[23] Xiao R Z, Tan W B, Li X Z, Song Z M, Sun J, Chen C H 2012 Phys. Plasmas 19 093102
[24] Huo S F, Chen C H, Sun J, Song Z M, Song W, Xiao R Z 2011 High Power Laser and Particle Beams 11 2959 (in Chinese) [霍少飞, 陈昌华, 孙钧, 宋志敏, 宋玮, 肖仁珍 2011 强激光与粒子束 11 2959]
[25] Wang G Q, Wang J G, Wang X F, Tong C J, Li S, Lu X C 2013 Pro. SPIE 890904
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[1] Siegel H P 2002 IEEE Trans. Microw. Theory Tech. 50 910
[2] Booske J H, Dobbs R J, Joye C D, Kory C L, Neil G R, Park G, Park J, Temkin R J 2011 IEEE Trans. Terahertz Sci. Techn. 1 54
[3] Bratman V L, Denisov G G, Ofitserov M M, Korovin S D, Polevin S D, Rostov V V 1987 IEEE Trans. Plasma Sci. PS-15 2
[4] Min S H, Kwon O J, Sattorov M A, So J K, Park S H, Baek I K, Choi D H, Shin Y M, Park G S 2011 Proceedings of 36th International conference on IRMMW-THz Houston, USA, October 2-7 2011 p1
[5] Bratman V L, Fedotov A E, Makhalov P B 2012 Phys.Plasmas. 19 020704
[6] Bratman V, Glyavin M, Idehara T, Kalynov Y, Luchinin A, Manuilov V, Mitsudo S, Ogawa I, Saito T, Tatematsu Y, Zapevalov V 2009 IEEE Trans. Plasma Sci. 37 36
[7] Chen Z, Wang J, Wang Y, Qiao H, Guo W and Zhang D 2014 Chin. Phys. B 23 068402
[8] Chen Z, Wang J, Wang Y 2014 Chin. Phys. B 23 108401
[9] Booske J H 2008 Phys. Plasma 15 055502
[10] Paoloni C, Brunetti F, Carlo A D, Mineo M, Tamburri E, Terranova M L, Ulisse G, Durand A, Marchesin R, Pham K, Krozer V, M Kotiranta, Rossi A D, Dolfi D, Guiset P, Legagneux P, Schnell J P, Fiorello A, Dispenza M, Secchi A, Zhurbenko V, Megtert S, Bouamrane F, Cojocaru C S, Gohier A 2011 Proceedings of International Vacuum Electronics Conference, Bangalore, India, February 21-24 2011 p55
[11] Nusinovich G S, Pu R F, Antonsen T M, Sinitsyn O V, Rodgers J, Mohamed A, Silverman J, Sheikhly M A, Dimant Y S, Milikh G M 2011 J Infrared Milli Terahertz Waves 32 380
[12] David K A, Yuval C, Susanne M M, Alan B, Baruch L, Thomas M A, William W D 1998 IEEE Trans. Plasma Sci. 26 591
[13] Chen H B, Zhou C M, Hu L L, Ma G W, Xu D M, Song R, Jin X 2010 High Power Laser and Particle Beams 22 865 (in Chinese) [陈洪斌,周传明,胡林林、马国武,许冬明,宋睿,金晓 2010 强激光与粒子束 22 865]
[14] Wang G Q, Wang J G, Li X Z, Fan R Y, Wang X Z, Wang X F, Tong C J 2010 Acta Phys. Sin. 59 8459 (in Chinese) [王光强, 王建国, 李小泽, 范如玉, 王行舟, 王雪锋, 童长江 2010 59 8459]
[15] Wang G Q, Wang J G, Li S, Wang X F, Tong C J Lu X C, Guo W J 2013 Acta Phys. Sin. 62 150701 (in Chinese) [王光强, 王建国, 李爽, 王雪锋, 童长江, 陆希成, 郭伟杰 2013 62 150701]
[16] Li X Z, Wang G Q, Wang J G, Tong C J, Wang X F, Song Z M, Li S, Lu X C 2013 High Power Laser and Particle Beams 25 451 (in Chinese) [李小泽, 王光强, 王建国, 童长江, 王雪锋, 李爽, 陆希成 2013 强激光与粒子束 25 451]
[17] Wang G Q, Wang J G, Tong C J, Li X Z, Li S, Wang X F, Lu X C 2013 Phys. Plasmas 20 043105
[18] Li X Z, Wang J G, Sun J, Song Z M, Ye H, Zhang Y C, Zhang L J, Zhang L G 2013 IEEE Trans. Electron Devices 60 2931
[19] Swegle J A, Poukey J W, Leifeste G T 1985 Phys. Fluids 28 2882
[20] Li S, Wang J G, Tong C J, Wang G Q, Lu X C, Wang X F 2013 Acta Phys. Sin. 62 120703 (in Chinese) [李爽, 王建国, 童长江, 王光强, 陆希成, 王雪锋 2013 62 120703]
[21] Wang J G, Zhang D H, Liu C L, Li Y D, Wang Y, Wang H G, Qiao H L, Li X Z 2009 Phys. Plasmas 16 033108
[22] Li S, Wang G Q, Tong C J, Wang X F 2013 Proceedings of Cross Strait Quad-Regional Radio Science and Wireless Technology Conferenece Chengdu, China, July 21-25 2013 p408
[23] Xiao R Z, Tan W B, Li X Z, Song Z M, Sun J, Chen C H 2012 Phys. Plasmas 19 093102
[24] Huo S F, Chen C H, Sun J, Song Z M, Song W, Xiao R Z 2011 High Power Laser and Particle Beams 11 2959 (in Chinese) [霍少飞, 陈昌华, 孙钧, 宋志敏, 宋玮, 肖仁珍 2011 强激光与粒子束 11 2959]
[25] Wang G Q, Wang J G, Wang X F, Tong C J, Li S, Lu X C 2013 Pro. SPIE 890904
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