volume | PIER Journals

Abstract

In this work, the design studies of a 60 GHz, 100 kW CW gyrotron have been presented. Mode selection is carefully studied with the aim of minimizing mode competition and to yield a perfect solid beam output through an RF window with a suitable dimpled-wall quasi-optical launcher. Cavity design and interaction computations are then carried out. In addition, preliminary design of the magnetron injection gun, magnetic guidance system, launcher, and RF window are presented. Thus, we present a feasibility study, which indicates that the operation of such a gyrotron is possible and can give a power in excess of 100 kW at an efficiency > 35%. As a part of this work, a complete Graphical User Interface package "GDS V.01" (Gyrotron Design Suit Ver.01) has been developed for the design and conceptualization of specific gyrotrons.

1. Kartikeyan, M. V., E. Borie, and M. Thumm, Gyrotrons ---High Power Microwave and Millimeter Wave Technology, Springer-Verlag, 2004.

2. Thumm, M., State-of-the-art of High Power Gyro-devices and Free Electron Masers Update 2008, Scientific Report FZKA 7467, Apr. 2009.

3. Woskoboinikow, P., "Development of gyrotrons for plasma diagnostics," Review of Scientific Instruments, Mar. 1986. Google Scholar

4. Petelin, M. I., "Self-excitation of oscillations in a gyrotron," Inst. Appl. Phys., in Gyrotrons: Collected Papers, USSR Academy of Sciences, Gorki, Russia, 1981. Google Scholar

5. Kreischer, K. E. and R. J. Temkin, "Linear theory of an electron cyclotron maser operating at the fundamental," Int. J. Infrared Millim. Waves, Vol. 1, No. 2, 195-223, Jun. 1980.
doi:10.1007/BF01007116 Google Scholar

6. Nusinovich, G. S., "Linear theory of a gyrotron with weakly tapered external magnetic field," Int. J. Electron., Vol. 64, No. 1, 127-136, Jan. 1988.
doi:10.1080/00207218808962789 Google Scholar

7. Borie, E. and B. Jdicke, "Comments on the linear theory of the gyrotron," IEEE Trans. Plasma Sci., Vol. 16, No. 2, 116-121, Aug. 1988.
doi:10.1109/27.3802 Google Scholar

8. Fliflet, A. W. and M. E. Read, "Use of weakly irregular waveguide theory to calculate eigenfrequencies, Q-values and RF field functions for gyrotron oscillators," Int. J. Electronics, Vol. 51, 475-484, 1981.
doi:10.1080/00207218108901350 Google Scholar

9. Borie, E. and O. Dumbrajs, "Calculation of eigenmodes of tapered gyrotron resonators," Int. J. Electronics, Vol. 60, 143-154, 1986.
doi:10.1080/00207218608920768 Google Scholar

10. Borie, E., Gyrotron Oscillators: Their Principles and Practice, edited by C. J. Edgcombe, Ch. 3, Taylor & Francis, 1993.

11. Fliflet, A. W., M. E. Read, K. R. Chu, and R. Seeley, "A self-consistent field theory for gyrotron oscillators: Application to a low Q gyromonotron," Int. J. Electronics, Vol. 53, 505-521, 1982.
doi:10.1080/00207218208901545 Google Scholar

12. Borie, E., B. Jodicke, and O. Dumbrajs, "Self consistent code for a 150 GHz gyrotron," Int. J. Electronics, Vol. 7, 1863-1879, 1986. Google Scholar

13. Bratman, V. L., M. A. Moiseev, M. I. Petelin, and R. E. Erm, "Theory of gyrotrons with a non-fixed structure of the high-frequency field," Radiophys. Quantum Electron., Vol. 16, No. 4, 474-480, Apr. 1973.
doi:10.1007/BF01030898 Google Scholar

14. Bratman, V. L., M. A. Moiseev, and M. I. Petelin, "Theory of gyrotrons with low-Q electromagnetic systems," Inst. Appl. Phys., in Gyrotrons: Collected Papers, USSR Academy of Sciences, Gorki, Russia, 1981. Google Scholar

15. Kern, S., "Numerische Simulation der Gyrotron-Wechselwirkung in koaxialen Resonatoren," Scientific Rep. FZKA 5837, Forschungszentrum Karlsruhe, Nov. 1996. Google Scholar

16. Baird, J. M. and W. Lawson, "Magnetron injection gun (MIG) design for gyrotron applications," Int. J. Electronics, Vol. 61, 969-984, 1986. Google Scholar

17. Vaughan, J. R. M., "Representation of axisymmetric magnetic fields in computer programs," IEEE Transactions on Electron. Devices, Vol. 19, 144, 1972.
doi:10.1109/T-ED.1972.17390 Google Scholar

18. Illy, S., "ESRAY --- A computer code for the analysis of axisymmetric electron guns," Private Communication, 2002. Google Scholar

19. Wagner, D., M. Thumm, G. Gantenbein, W. Kasperek, and T. Idehara, "Analysis of a complete gyrotrons oscillator using the scattering matrix description," Int. J. Infrared Millimeter Waves, Vol. 19, No. 2, 185-194, 1998.
doi:10.1023/A:1022515506809 Google Scholar

20. Chauhan, N., A. Mittal, D. Wagner, M. V. Kartikeyan, and M. Thumm, "Design and optimization of nonlinear tapers using particle swarm optimization," Int. J. Infrared & Millimeter Waves, Vol. 29, No. 8, 792-798, Aug. 2008.
doi:10.1007/s10762-008-9366-5 Google Scholar

21. Cascade scattering matrix Code,v 3.0, Calabazas Creek Research Inc., 2000.

22. Thumm, M., "Modes and mode conversion in microwave devices," Generation and Application of High Power Microwaves, R. A. Cairns and A. D. R. Phelps (eds.), IOP, Bristol, U.K., 121-171, 1997. Google Scholar

23. Jin, J., "Quasi-optical mode converter for a coaxial cavity gyrotron," Wissenschaftliche Berichte, No. FZKA 7264, Karlsruhe, Mar. 2007. Google Scholar

24. Jin, J., B. Piosczyk, M. Thumm, T. Rzesnicki, and S. Zhang, "Quasi-optical mode converter/mirror system for a high power coaxial-cavity gyrotron," IEEE Transactions on Plasma Science, Vol. 34, No. 4, 1508-1515, Aug. 2006.
doi:10.1109/TPS.2006.877627 Google Scholar

25. Launcher Optimization Tool, User Manua, Version 1.21, Calabazas Creek Research, Inc., 2006.

26. Nickel, H.-U., "Aspects of high frequency technology for the development of low-reflection output windows for high power millimeter-wave gyrotrons," Sci. Rep. FZKA 5513, Forschungszentrum Karlsruhe, Karlsruhe, Germany, 1995. Google Scholar

27. He, W., C. G. Whyte, E. G. Rafferty, A. W. Cross, A. D. R. Phelps, K. Ronald, A. R. Young, C. W.Robertson, D. C. Speirs, and David Rowlands, "Axis-encircling electron beam generation using a smooth magnetic cusp for gyrodevices," Appl. Phys. Lett., Vol. 93, 121501, 2008.
doi:10.1063/1.2988259 Google Scholar

28. Donaldson, C. R., W. He, A. W. Cross, F. Li, A. D. R. Phelps, L. Zhang, K. Ronald, C. W. Robertson, C. G. Whyte, and A. R. Young, "A cusp electron gun for millimeter wave gyrodevices," Appl. Phys. Lett., Vol. 96, 141501, 2010.
doi:10.1063/1.3374888 Google Scholar

29. Cooke, S. J., A. W. Cross, W. He, and A. D. R. Phelps, "Experimental operation of a cyclotron autoresonance maser oscillator at the second harmonic," Phys. Rev. Lett., Vol. 77, 4836-4839, 1996.
doi:10.1103/PhysRevLett.77.4836 Google Scholar

30. Hirata, Y., Y. Mitsunaka, K. Hayashi, Y. Itoh, K. Sakamoto, and T. Imai, "The design of a tapered dimple-type mode converter/launcher for high-power gyrotrons," IEEE Transactions on Plasma Science, Vol. 31, No. 1, 142-145, Feb. 2003.
doi:10.1109/TPS.2003.808864 Google Scholar

31. Neilson, J. M., "Optimal synthesis of quasi-optical launchers for high-power gyrotrons," IEEE Transactions on Plasma Science, Vol. 34, No. 3, 635-641, Jun. 2006.
doi:10.1109/TPS.2006.875755 Google Scholar

32. Thumm, M., "Development of output windows for high power long pulse gyrotrons and EC wave applications," Int. J. Infrared Millim. Waves, Vol. 19, 3-14, 1998.
doi:10.1023/A:1022514528711 Google Scholar

33. Borie, E. and S. Kern, "On the effect of RF-space charge on the beam-field interaction in gyrotrons," J. Infrared Milli. Terahz Waves, Vol. 30, 915-923, 2009.
doi:10.1007/s10762-009-9520-8 Google Scholar

Ms. Ragini Jain

Prof. Machavaram Kartikeyan