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Mode competition induces non-stationary oscillations during the operation of a gyrotron backward-wave oscillator (gyro-BWO), which severely reduces its tunable bandwidth and output power. Self-consistent nonlinear theory is used to study the modes-competition mechanism of a W-band fundamental TE01 mode gyro-BWO. Tapered non-resonant interaction circuit structure and loading lossy ceramic are employed to suppress the competing modes, as a way of preventing non-stationary oscillation in the circuit. Systematically optimized interaction circuit is capable of suppressing all the competing modes and can stably operate in the fundamental axial mode of the TE01 mode. Calculation indicates that a peak power of 105 kW and a -3 dB tunable bandwidth of 5.4% are attainable. This is meaningful and provides a theoretical foundation for developing broadband millimeter gyro-BWOs in the applications of counter-measure system, non-destructive detection, plasma diagnosis, material processing, and so on.
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Keywords:
- millimeter-wave source /
- electron cyclotron maser /
- gyro-BWO /
- lossy dielectric
[1] Chu K R 2004 Rev. Mod. Phys. 76, 492
[2] Chen N C, Chang T H, Yuan C P, Idehara T, Ogawa Isamu 2010 App. Phys. Lett. 96 161501
[3] Chen S H, Chang T H, Pao K F, Fan C T, Chu K R 2002 Physical Review Lett. 89 268303
[4] Du C H, Liu P K, Xue Q Z 2010 Acta. Phys. Sin. 59 4612 (in Chinese) [杜朝海, 刘濮鲲, 薛谦忠 2010 59 4612]
[5] Nusinovich G S, Dumbrajs O 1996 IEEE Trans. Plasma Science, 24 620
[6] Chang T H, Chen S H, Barnett L R, Chu K R 2001 Physcial Review Lett. 87 064802
[7] Kou C S, Chen S H, Barnett L R, Chen H Y, Chu K R 1993 Physical Review Lett. 70 924
[8] Fan C T, Chang T H, Pao K F, Chu K R 2007 Physics of Plasmas 14 093102
[9] He W L, Ronald K, Youn A R, Cross A W, Phelps A D R, Whyte C G, Rafferty E G, Thomson J, Robertson C W, Speirs D C, Samsonov S V, Bratman V L, Denisov G G 2005 IEEE Trans. on Electron Devices 52 839
[10] Pao K F, Fan C T, Chang T H, Chiu C C, Chu K R 2007 Physics of Plasmas. 14 093301
[11] Kou C S, Chen C H, Wu T J 1998 Physical Review E 57 7162
[12] Chen S H, Chu K R, Chang T H 2000 Physical Review Lett. 85 2633
[13] Chang T H, Yu C F, Hung C L, Yeh Y S, Hsiao M C, Shin Y Y 2008 Physics of Plasmas 15 073105
[14] Luo Y T, Tang C J 2011 Acta. Phys. Sin. 60 014104 (in Chinese) [罗尧天 唐昌建 2011 60 014104]
[15] Chu K R, Chen H Y, Huang C L, Chang T H, Barnett L R, Chen S H, Yang T T, Dialetis D J 1999 IEEE Trans. Plasma Sci. 27 391
[16] Du C H, Liu P K 2010 J. Infrared Milli Terahz Waves 13 714
[17] Du C H, Liu P K 2010 Physics of Plasmas 17 033104
[18] Du C H, Xue Q Z, Liu P K 2008 IEEE Electron Device Letters, 29 1256
[19] Du C H , Liu P K 2009 IEEE Transactions on Electron Devices, 56 2335
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[1] Chu K R 2004 Rev. Mod. Phys. 76, 492
[2] Chen N C, Chang T H, Yuan C P, Idehara T, Ogawa Isamu 2010 App. Phys. Lett. 96 161501
[3] Chen S H, Chang T H, Pao K F, Fan C T, Chu K R 2002 Physical Review Lett. 89 268303
[4] Du C H, Liu P K, Xue Q Z 2010 Acta. Phys. Sin. 59 4612 (in Chinese) [杜朝海, 刘濮鲲, 薛谦忠 2010 59 4612]
[5] Nusinovich G S, Dumbrajs O 1996 IEEE Trans. Plasma Science, 24 620
[6] Chang T H, Chen S H, Barnett L R, Chu K R 2001 Physcial Review Lett. 87 064802
[7] Kou C S, Chen S H, Barnett L R, Chen H Y, Chu K R 1993 Physical Review Lett. 70 924
[8] Fan C T, Chang T H, Pao K F, Chu K R 2007 Physics of Plasmas 14 093102
[9] He W L, Ronald K, Youn A R, Cross A W, Phelps A D R, Whyte C G, Rafferty E G, Thomson J, Robertson C W, Speirs D C, Samsonov S V, Bratman V L, Denisov G G 2005 IEEE Trans. on Electron Devices 52 839
[10] Pao K F, Fan C T, Chang T H, Chiu C C, Chu K R 2007 Physics of Plasmas. 14 093301
[11] Kou C S, Chen C H, Wu T J 1998 Physical Review E 57 7162
[12] Chen S H, Chu K R, Chang T H 2000 Physical Review Lett. 85 2633
[13] Chang T H, Yu C F, Hung C L, Yeh Y S, Hsiao M C, Shin Y Y 2008 Physics of Plasmas 15 073105
[14] Luo Y T, Tang C J 2011 Acta. Phys. Sin. 60 014104 (in Chinese) [罗尧天 唐昌建 2011 60 014104]
[15] Chu K R, Chen H Y, Huang C L, Chang T H, Barnett L R, Chen S H, Yang T T, Dialetis D J 1999 IEEE Trans. Plasma Sci. 27 391
[16] Du C H, Liu P K 2010 J. Infrared Milli Terahz Waves 13 714
[17] Du C H, Liu P K 2010 Physics of Plasmas 17 033104
[18] Du C H, Xue Q Z, Liu P K 2008 IEEE Electron Device Letters, 29 1256
[19] Du C H , Liu P K 2009 IEEE Transactions on Electron Devices, 56 2335
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