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Volume 32 Issue 7
Aug.  2010
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Du Chao-hai, Liu Pu-kun, Xue Qian-zhong, Xu Shou-xi, Zhang Shi-chang. An Ultra-high Gain Gyrotron Traveling-Wave Amplifier with High Stability[J]. Journal of Electronics & Information Technology, 2010, 32(7): 1717-1720. doi: 10.3724/SP.J.1146.2009.00880
Citation: Du Chao-hai, Liu Pu-kun, Xue Qian-zhong, Xu Shou-xi, Zhang Shi-chang. An Ultra-high Gain Gyrotron Traveling-Wave Amplifier with High Stability[J]. Journal of Electronics & Information Technology, 2010, 32(7): 1717-1720. doi: 10.3724/SP.J.1146.2009.00880

An Ultra-high Gain Gyrotron Traveling-Wave Amplifier with High Stability

doi: 10.3724/SP.J.1146.2009.00880
  • Received Date: 2009-06-16
  • Rev Recd Date: 2010-02-04
  • Publish Date: 2010-07-19
  • The linear theory together with the self-consistent nonlinear theory are applied to systematically study the stability of a Ka-band TE11 mode ultra-high gain gyrotron Traveling-Wave Amplifier (gyro-TWA). The analysis reveals the differences between the forward-wave absolute instability and the backward-wave oscillation, as well as the suppressing effect to these self-excited oscillations by using distributed loss technique. Using properly down-tapering the magnetic in the nonlinear stage to improve the stability of the system is proposed for the first time. Based on the analysis, a Ka-band TE11 mode gyro-TWA with ultra-high gain ability is designed, which adopts an electron beam with voltage of 100 kV, current of 7 A, velocity spread of 5%, and is capable of obtaining the -1 dB saturated bandwidth about 5 GHz and the highest gain about 80dB.
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  • Chu K R. The electron cyclotron maser[J]. Reviews ofModern Physics, 2004, 76(2): 489-540.[2] Chu K R and Chen H Y, et al.. Theory and experiment ofultrahigh-gain gyrotron traveling wave amplifier[J]. IEEETransactions on Plasma Science, 1999, 27(2): 391-404.[3] Chu K R and Chen H Y, et al.. Ultrahigh gain gyrotrontraveling wave amplifier[J]. Physical Review Letters, 1998,81(21): 4760-4763.[4] Calame J P and Garven M, et al.. Gyrotron-travelingwave-tube circuit based on lossy ceramics[J]. IEEETransactions on Electron Devices, 2002, 49(8): 1469-1477.[5] 纵啸宇,薛谦忠,杜朝海. 损耗介质加载Ka波段TE01模回旋行波管放大器稳定性的分析[J]. 电子与信息学报, 2009, 31(6):1483-1486.Zong Xiao-yu, Xue Qian-zhong, and Du Chao-hai. Stabilitystudy of a Ka-band lossy dielectric-loaded TE01 modegyrotron traveling-wave-tube amplifier[J]. Journal ofElectronics Information Technology, 2009, 25(5):1483-1486.[6] Du Chao-hai, Liu Pu-kun, and Xue Qian-zhong, et al.. Effectof a backward wave on the stability of an ultrahigh gaingyrotron traveling-wave amplifier[J]. Physics of Plasmas,2008, 15(123107): 1-8.[7] Park G S, Park S Y, and Kyser R H, et al.. Broadbandoperation of a Ka-band tapered gyro-traveling waveamplifier[J]. IEEE Transactions on Plasma Science, 1994,22(5): 536-543.[8] Chong C K, McDermott D B, Luhmann, and N C Jr, et al..Large-singal operation of a third-harmonic slotted gyro-TWTamplifier[J]. IEEE Transactions on Plasma Science, 199826(3): 500-507.[9] Garven M and Calame J P, et al.. A gyrotron-traveling-wavetube amplifier experiment with a ceramic loaded interactionregion[J]. IEEE Transactions on Plasma Science, 2002, 30(3):885-893.[10] Bratman V L, Cross A W, and Denisov G G, et al.. High-gainwide-band gyrotron traveling wave amplifier with a helicallycorrugated waveguide[J]. Physical Review Letters, 2000,84(12): 2746-2749.[11] Pershing D E and Nguyen K T, et al.. A TE11 Ka-bandgyro-TWT amplifier with high-average power compatibledistributed loss[J]. IEEE Transactions on Plasma Science,2004, 32(3): 947-956.[12] Nguyen K T and Calame J P, et al.. Design of a Ka-bandgyro-TWT for radar applications[J]. IEEE Transactions onElectron Devices, 2001, 48(1): 108-115.[13] Du Chao-hai, Xue Qian-zhong, and Liu Pu-kun. Loss-inducedmodal transition in a dielectric-coated metal cylindricalwaveguide for gyro-traveling-wave-tube applications[J]. IEEEElectron Device Letters, 2008, 29(11): 1256-1258.[14] Du Chao-hai, Xue Qian-zhong, and Liu Pu-kun, et al.. Modaltransition and reduction in a lossy dielectric-coatedwaveguide for gyrotron-traveling-wave tube amplifierapplications[J]. IEEE Transactions on Electron Devices, 2009,56(5): 839-845.[15] 殷瑞剑, 刘濮鲲. 3mm回旋行波放大器单阳极磁控注入式电子枪的设计[J]. 电子与信息学报, 2008, 30(6): 1507-1510.Yin Rui-jian and Liu Pu-kun. Design of a single-anodemagnetron-injected-gun for the 3mm GYRO-TWTamplifiers[J]. Journal of Electronics InformationTechnology, 2008, 30(6): 1507-1510.
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