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A quasi-optical mode converter for a whispering-gallery mode gyrotron，consisting of a Vlasov helically-cut launcher and two curved-mirror reflectors, is studied and designed. Firstly, the operation mechanism of the Vlasov type quasi-optical mode converter is investigated using geometric optics theory. And then, applying the aperture field integration and the surface current source integration of the vector diffraction theory, a numerical simulation code is programmed. Finally, the code is used to study a quasi-optical converter system of a W-band whispering-gallery mode gyrotron, and the operation mechanism of the mode conversion in the converter is revealed in detail. Numerical results indicate that the TE12,2 whispering-gallery mode inside the W-band gyrotron is converted into a highly Gaussian-like beam at the output window.
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Keywords:
- gyrotron /
- whispering-gallery mode /
- quasi-optical mode converter /
- W-band
[1] ［1］Chu K R 2004 Rev. Mod. Phys. 76 489
[2] ［2］Thumm M 2008 Sci. Rep. FZKA 7392 1
[3] ［3］Kartikeyan M V, Borie E, Thumm M 2004 Gyrotrons: High Power Microwave and Millimeter Wave Technology (Berlin: Springer-Verlag) p7
[4] ［4］Nusinovich G S 2004 Introduction to the Physics of Gyrotrons (Baltimore and London: Johns Hopkins University) p3
[5] ［5］Edgcombe C J 1993 Gyrotron Oscillators:Their Principles and Practice (London: Taylor and Francis) p1
[6] ［6］Lorbeck J A, Vernon R J 1991 IEEE Trans. Anten. Propag. 39 1733
[7] ［7］Mobius A W, Casey J A, Kreischer K E, Li A, Temkin R J 1992 Int. J. Infra. Millim. Waves 13 1033
[8] ［8］Liu X J, Li H F, Yu S, Xie Z L, Yang S W 2002 Acta Phys. Sin. 51 2291 (in Chinese) ［牛新建、 李宏福、 喻胜、 谢仲怜、 杨仕文 2002 物理学报 51 2291］
[9] ［9］Vlasov S N, Zagryadskaya L I, Petelin M I 1975 Radio Engng. Electron. Phys. 20 14
[10] ］Wada O, Hashimoto M, Nakajima M 1988 Int. J. Electron. 65 725
[11] ］Miyake S, Wada O, Nakajima M, Idehara T, Brand G F 1991 Int. J. Electron. 70 979
[12] ］Blank M, Casey J A, Kreischer K E, Temkin R J, Price T 1992 Int. J. Electron. 72 1093
[13] ］Lorbeck J A, Vernon R J 1995 IEEE Trans. Antennas Propag. 43 1383
[14] ］Zhou H J, Ding W, Liu Q X 2002 High Power Laser Part. Beams 14 431 (in Chinese) ［周海京、丁武、 刘庆想 2002 强激光与粒子束 14 431］
[15] ］Iatrou C T 1995 IEEE Tran. Microwave Theor. Technol. 43 529
[16] ］Yang S W, Tan S H, Li H F 2002 IEEE Trans Microwave Theory Tech. 50 1849
[17] ］］Drumm O 2002 Wissenschaftliche Berichte FZKA 6754 Ph.D. Dissertation (in German) 39
[18] ］Jin J B, Piosczyk B, Thumm M, Rzesnicki T, Zahng S C 2006 IEEE Trans. Plasma Sci. 34 1508
[19] ］Kong J A 1986 Electromagnetic Wave Theory (New York: John Wiley and Sons ) p381
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[1] ［1］Chu K R 2004 Rev. Mod. Phys. 76 489
[2] ［2］Thumm M 2008 Sci. Rep. FZKA 7392 1
[3] ［3］Kartikeyan M V, Borie E, Thumm M 2004 Gyrotrons: High Power Microwave and Millimeter Wave Technology (Berlin: Springer-Verlag) p7
[4] ［4］Nusinovich G S 2004 Introduction to the Physics of Gyrotrons (Baltimore and London: Johns Hopkins University) p3
[5] ［5］Edgcombe C J 1993 Gyrotron Oscillators:Their Principles and Practice (London: Taylor and Francis) p1
[6] ［6］Lorbeck J A, Vernon R J 1991 IEEE Trans. Anten. Propag. 39 1733
[7] ［7］Mobius A W, Casey J A, Kreischer K E, Li A, Temkin R J 1992 Int. J. Infra. Millim. Waves 13 1033
[8] ［8］Liu X J, Li H F, Yu S, Xie Z L, Yang S W 2002 Acta Phys. Sin. 51 2291 (in Chinese) ［牛新建、 李宏福、 喻胜、 谢仲怜、 杨仕文 2002 物理学报 51 2291］
[9] ［9］Vlasov S N, Zagryadskaya L I, Petelin M I 1975 Radio Engng. Electron. Phys. 20 14
[10] ］Wada O, Hashimoto M, Nakajima M 1988 Int. J. Electron. 65 725
[11] ］Miyake S, Wada O, Nakajima M, Idehara T, Brand G F 1991 Int. J. Electron. 70 979
[12] ］Blank M, Casey J A, Kreischer K E, Temkin R J, Price T 1992 Int. J. Electron. 72 1093
[13] ］Lorbeck J A, Vernon R J 1995 IEEE Trans. Antennas Propag. 43 1383
[14] ］Zhou H J, Ding W, Liu Q X 2002 High Power Laser Part. Beams 14 431 (in Chinese) ［周海京、丁武、 刘庆想 2002 强激光与粒子束 14 431］
[15] ］Iatrou C T 1995 IEEE Tran. Microwave Theor. Technol. 43 529
[16] ］Yang S W, Tan S H, Li H F 2002 IEEE Trans Microwave Theory Tech. 50 1849
[17] ］］Drumm O 2002 Wissenschaftliche Berichte FZKA 6754 Ph.D. Dissertation (in German) 39
[18] ］Jin J B, Piosczyk B, Thumm M, Rzesnicki T, Zahng S C 2006 IEEE Trans. Plasma Sci. 34 1508
[19] ］Kong J A 1986 Electromagnetic Wave Theory (New York: John Wiley and Sons ) p381
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