請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/55083
完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 朱國瑞(Kwo-Ray Chu) | |
dc.contributor.author | Pei-Che Chang | en |
dc.contributor.author | 張培哲 | zh_TW |
dc.date.accessioned | 2021-06-16T03:46:38Z | - |
dc.date.available | 2015-03-13 | |
dc.date.copyright | 2015-03-13 | |
dc.date.issued | 2015 | |
dc.date.submitted | 2015-01-30 | |
dc.identifier.citation | [1] K. R. Chu, Rev. Mod. Phys. 76, 489 (2004).
[2] V. Gaponov-Grekhov and V. L. Granatstein, Applications of High-Power Microwaves, Artech House, Boston London, 1994. [3] V. L. Granatstein, B. Levush, B. G. Danly, and R. K. Parker, IEEE Trans. Plasma Sci. 25, 1322 (1997). [4] A.S. Gilmour Jr., Microwave Tubes, Artech House, Norwood, 1986. [5] Benford, James, John A. Swegle, and Edl Schamiloglu. High power microwaves. CRC Press, 2007. [6] Tsimring, Shulim E. Electron beams and microwave vacuum electronics. Vol. 191. John Wiley & Sons, 2006. [7] Gilmour, A. S. Klystrons, traveling wave tubes, magnetrons, crossed-field amplifiers, and gyrotrons. Artech House, 2011. [8] J. W. Gewartowski and H. A. Watson, Principles of Electron Tubes, 1970. [9] S. H. Gold and G. S. Nusinovich, Rev. Sci. Instrum. 68, 3945 (1997). [10] W. Fliflet, Int. J. Electron. 61, 1049 (1986). [11] K. R. Chu and A.T. Lin, IEEE Trans. Plasma Sci. 16, 90 (1988). [12] K. R. Chu, H. Y. Chen, C. L. Hung, T. H. Chang, L. R. Barnett, S. H. Chen, and T. T. Yang, Phys. Rev. Lett. 81 4760 (1998). [13] K. R. Chu, H. Y. Chen, C. L. Hung, T. H. Chang, L. R. Barnett, S. H. Chen, T. T. Yang and Demostehenes J. Dialetis, IEEE Trans. Plasma Sci. 27, 391 (1999). [14] G. P. Timms and G. F. Brand, Appl. Phys. Lett. 68, 2899 (1996). [15] T. Idehara, I, Ogawa, S. Mitsudo, M. Pereyaslavets, N. Nishida, and K. Yoshida, IEEE Trans. Plasma Sci. 27, (1999). [16] C. S. Kou, S. H. Chen, L. R. Barnett, H. Y. Chen, and K. R. Chu, Phys. Rev. Lett. 70, 924 (1993). [17] C. S. Kou, Phys. Plasmas 1, 3093 (1994). [18] M. A. Basten, W. C. Guss, K. E. Kreischer, R. J. Temkin, and M. Caplan, Int. J.Infr. Millimeter Waves, 16, 889 (1995). [19] A. T. Lin and C. C. Lin, Phys. Fluids B. 5, 2314 (1993). [20] G. S. Nusinovich, and O. Dumbrajs, IEEE Trans. Plasma Sci. 24, 620 (1996). [21] S. H. Chen, K. R. Chu, and T. H. Chang, Phys. Rev. Lett. 85, 2633 (2000). [22] G. S. Nusinovich, A. N. Vlasov, and T. M. Antonsen, Jr., Phys. Rev. Lett. 87, 218301 (2001). [23] T. H. Chang, S. H. Chen, L. R. Barnett and K. R. Chu, Phys. Rev. Lett. 87, 064802 (2001). [24] S. H. Chen, T. H. Chang, K. F. Pao, C. T. Fan and K. R. Chu, Phys. Rev. Lett. 89, 268303 (2002). [25] A. K. Ganguly, and S. Ahn. Int. J. Electronics 67, 261 (1989). [26] M. T. Walter, et al, IEEE Trans. Plasma Sci. 22, 578 (1994). [27] M. T. Walter, et al, IEEE Trans. Plasma Sci. 24, 636 (1996). [28] A. T. Lin, Phys. Rev. A 46, 4516 (1992). [29] G. S. Nusinovich and O. Dumbrajs, IEEE Trans. Plasma Sci. 24, 620 (1996). [30] C. S. Kou, C. H. Chen, and T. J. Wu, Phys. Rev. E. 57, 7162 (1998). [31] K. F. Pao, et al. Phys. Rev. Lett. 95, 185101 (2005). [32] K. F. Pao, C. T. Fan, T. H. Chang, C. C. Chiu, and K. R. Chu, Phys. Plasmas 14, 093301 (2007). [33] T. H. Chang, C. F. Yu, C. L. Hung, Y. S. Yeh, M. C. Hsiao, and Y. Y. Shin, Phys. Plasmas 15, 073105 (2008). [34] N. S. Ginzburg, G. S. Nusinovich, and N. A. Zavolsky, Int. J. Electron. 61, 881, (1986). [35] A. T. Lin, Z. H. Yang, and K. R. Chu, IEEE Trans. Plasma Sci. 16, 129, (1988). [36] K. R. Chu, M. Read, and A. K. Ganguly, IEEE Trans. Plasma Sci. 284, 620 (1980). [37] K.R. Chu, L.R. Barnett, H.Y. Chen, S.H. Chen, Ch. Wang, Y.S. Yeh, Y.C. Tsai, T.T. Yang, and T.Y. Dawn, Phys. Rev. Lett. 74, 1103 (1995). [38] L.R. Barnett, L.H. Chang, H.Y. Chen, K.R. Chu, W.K. Lau, and C.C. Tu, Phys. Rev. Lett. 63, 1062 (1989). [39] T. H. Chang, L. R. Barnett, K.R. Chu, F. Tai and C.L. Hsu, Rev. of Sci. Instruments, 70, 1530 (1999). [40] http://www.spectramat.com/ | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/55083 | - |
dc.description.abstract | 磁旋管是利用電子迴旋脈射機制 (electron cyclotron maser),而產生同調電磁波源涵蓋了毫米波-太赫茲的電磁波段,具有高功率和寬頻等特性。本篇論文主要是在研究磁旋反波振盪器(gyro-BWO)的實驗和模擬。磁旋反波振盪器是唯一一種在磁旋管四大家族裡可以做調頻的,模擬顯示,在未加傾斜磁場的時候,最佳效率可達30%,然而在傾斜磁場的情況下,對不同電流、磁場優化所有參數,3dB的頻寬可高達35%以上,這表示在不同的頻率調變下,不同電流都可達幾乎一樣高的效率,深具應用和研究價值。
磁旋反波振盪器不像磁旋單腔管(gyromonotron)有共振腔結構,而是基本上只有波導管的結構,所以存在的場型完全由電子和波的交互作用決定。在線性區間,有不同的軸向振盪模式,各自都具有固定的電子傳輸角(transit angle);而在非線性區間,由於內部回饋線路的收縮,使得場形向電子入口處集中,造成效率對電流及長度產生飽和現象。由於場形可藉電子與電磁波的交互作用調變,而外加磁場又主導交互作用,故不僅可用磁場強度調變頻率,尚可用磁場斜率優化效率,使之在不同電流下,均能達到高效率。最後,以實驗佐證,加了傾斜磁場頻寬增加。 | zh_TW |
dc.description.abstract | The gyrotron is a coherent radiation source based on the electron cyclotron maser (ECM) instability and capable of generating unprecedented power levels in the millimeter to terahertz (THz) region of the electromagnetic spectrum. The focus of the present study in my paper is gyrotron backward-wave oscillator (gyro-BWO) simulation and experiment. Gyro-BWO is the only version of four basic embodiments of gyrotron with continuous frequency tunability The simulation has provided the highest efficiency about 30% without taper magnetic field. After optimized the efficiency by taper magnetic field, the 3dB bandwidth can achieve up to 35% which implied frequency tuning in different currents almost reach the highest efficiency, while it is also the least exploited version although many applications require frequency tunable broadband sources.
The gyro-BWO employs a nonresonant interaction structure (basically a waveguide section). This makes the interaction dynamics fundamentally different from that of the cavity-based gyro-monotron. The existence of gyro-BWO oscillating modes and their field profiles must then depend entirely upon the beam-wave interaction. As it turns out, the field profiles of different axial modes are asymmetric in different ways, which in turn determines their competitive advantages. Moreover we can do the continuous frequency operation by tuning the magnetic field so optimized efficiency can be achieved through magnetic field and taper magnetic field in different current. In practical, we can also reach higher efficiency and bandwidth from low current to high current. A single-mode, stationary code and a multimode, time-dependent, particle-in-cell code are employed for electron dynamics and wave stability studies. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T03:46:38Z (GMT). No. of bitstreams: 1 ntu-104-D00222021-1.pdf: 4187024 bytes, checksum: 9bd94b26bc609e186b2add3ce8b1936a (MD5) Previous issue date: 2015 | en |
dc.description.tableofcontents | 口試委員會審定書 #
Acknoledgements i 中文摘要 ii ABSTRACT iii CONTENTS iv LIST OF FIGURES vii LIST OF TABLES xiii Chapter 1 Introduction 1 1.1 Basic Mechanism of Electron Cyclotron Maser 2 1.2 Gyrotron Devices 4 1.3 Overview 8 Chapter 2 Related Discussions on Magnetron Injection Gun (MIG) 12 2.1 Thermionic Cathodes 14 2.1.1 Thermionic Emission Mechanisms 14 2.1.2 Schottky Effect 16 2.1.3 Field Emission 17 2.1.4 Space Charge Limitation 18 2.1.5 Temperature Limitation 20 2.2 Magnetron Injection Gun (MIG) 21 2.3 Impregnated Dispenser Cathodes 22 2.4 Velocity Spread of Helical Electron Beam 25 2.4.1 Spread of Initial Electron Velocities 26 2.4.2 Roughness of the Emitter Surface 27 2.4.3 Nonuniform Distribution of Electric and Magnetic Fields Near the Cathode 28 2.4.4 Nonuniform Distribution of the Emission Current 28 2.4.5 Space-Charge Fields Effect 29 Chapter 3 Numerical Model of Gyrotron 30 3.1 Particle Tracing Technique 30 3.1.1 Field Equations 30 3.1.2 Electron Dynamics 33 3.1.3 Initial Electron Distribution 35 3.1.4 Boundary Conditions 36 3.1.5 Conversion to slow variables 38 Chapter 4 Gyro-BWO Simulation 42 4.1 Linear Behavior of Gyrotron Backward-Wave Oscillator 42 4.2 Saturated Behavior of the Gyrotron Backward-Wave Oscillator 46 4.3 Efficiency Enhancement by Applying Taper 51 4.4 Design a Broadband and High-Power Gyro-BWO 57 4.5 Some Simulation Results to Compare With Our Experiment 65 4.5.1 Purpose for Broadband 65 4.5.2 Purpose for High-Power 69 4.6 Quality Factor (Q) discussion 74 Chapter 5 Design, Test, and Analysis of The Experiment of Broadband Gyro-BWO 81 5.1 MIG Sensitivity Analysis 81 5.2 Experimental Setup and Diagnostic Circuit 87 5.2.1 Activation of The Cathode 87 5.2.2 Coupler Design and Assembling 89 5.2.3 NTU Super Conductor Magnet (SC Magnet) Field Profile 95 5.2.4 Experimental Setup and Diagnostic Circuits 96 5.3 Preliminary Experimental Results 98 REFERENCE 100 | |
dc.language.iso | en | |
dc.title | 高效率寬頻磁旋反波振盪器理論和實驗之研究 | zh_TW |
dc.title | Theoretic and Experimental Investigation of Gyrotron Backward-wave Oscillator with High Efficiency and Broad-Band Capabilities | en |
dc.type | Thesis | |
dc.date.schoolyear | 103-1 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 陳寬任(Kuan-Ren Chen),張存續(Tsun-Hsu Chang),陳仕宏(Shih-Hung Chen),陳漢穎(Han-Ying Chen) | |
dc.subject.keyword | 磁旋反波振盪器,電子槍,高效率,寬頻, | zh_TW |
dc.subject.keyword | gyro-BWO,E-gun,high efficiency,broadband, | en |
dc.relation.page | 102 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2015-02-02 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 物理研究所 | zh_TW |
顯示於系所單位: | 物理學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-104-1.pdf 目前未授權公開取用 | 4.09 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。