- All Journals
- Al-Qadisiyah University
- Basrah University
- Kirkuk University
- Mosul University
- The Iraqi Borad for Medical Specialization
- University of Anbar
- University of Technology
- Al Mustafa University
- Al-Zahraa University for Women
- Alnoor University
- Kunooz University
- Misan University
- Ninevah University
- Tikrit University
- University of Al-Hamdaniya
- University of Kerbala
Analysis and Design of 460 GHz Microwave Gyrotron Oscillator | ||
| Engineering and Technology Journal | ||
| Article 8, Volume 38, 3B, 2020, Pages 161-167 PDF (1.03 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.30684/etj.v38i3B.1937 | ||
| Authors | ||
| Luma Y. Abbas* ; Nedal A. Hussain | ||
| Department of Physics, College of Science University of Al-Mustansiriyah, Baghdad, Iraq | ||
| Abstract | ||
| This paper is concerned with the analysis and design of a gyrotron oscillator with 460 GHz that can excite both modes (TE231) the fundamental (230GHz) and (TE061, TE261) second harmonic (near 460GHz). The oscillator is operated with 12KV beam voltage and 100mA beam current, and a computer program was developed to study the cavity in this oscillator and the wave-particle interaction inside it using the forward finite difference technique as a numerical method. The input data of the program are electron energy, velocity ratio, normalized cavity length, the normalized value of the external magnetic field, the mode number (m,n,l), and nth-non van shining root of J_m^' (x)=0 to calculate the beam and starting currents, frequency and quality factor of the cavity. The results show good agreement with other reported works [10]- [12]- [13]- [14], [15] .This oscillator can serve as a millimeter-wave source at the magnetic field of (16.4T) for enhanced nuclear magnetic resonance and can be used to perform the biological experiment. | ||
| Keywords | ||
| Gyrotron; microwave tubes; millimeter-wave source; high-frequency device | ||
| References | ||
|
[1] F.C.de Lucia, “Science and technology in the sub millimeter region,” Optics and photonics News, Vol. 14, No.8, 2003. [2] D. Van der Wide, “Applications and outlook for electronic terahertz technology,” Optics and Photonics News, 14( 4), pp.44-50, 2003. [3] R. Callis ,W. Cary, S.Chu, J.Doane, R.Ellis, K.Felch,Y.Gorelov, HGrunloh, J.Hosea, K.Kajiwara, J.Lohr, T.Luce, J.Peavy, R. Pinsker , D. ponce, R. P. Rater, M. Shapiro, R. Temkin , and J. Tooker, “Maturing ECRF technology for plasma control,” Nuclear Fusion, 43(11), pp.798-807, 2003. [4] K. Felch , B. Danly , H. Jory , K. Kreischer , W. Lawson, B. Lawson, B. Lawson, B. Levush , and R. temkin “Characteristics and applications of fast-wave gyro devices,” Proceedings of the IEEE, Vol. 87, No. 5, pp.752-781,1999. [5] T. Idehara, I.Ogawa, S.Mitsudo, M.Pereyslavets, N.Nishida, and K.Yoshida , “Development of frequency tunable, medium power gyrotrons (gyrotron FU series) as sub millimeter wave radiation sources,” IEEE Trans. on Plasma Sci., vol. 27, No. 2, pp.340-354, 1999. [6] H. Li, Z.Xie, W.Wang, Y. Luo, P. Du, X.Den, H.Wang, S.Yu, X.Niu, L.Wang, and S.Liu., “A 35-GHz Low-voltage third-harmonic gyrotron with a permanent magnet system,” IEEE Trans. Plasma Sci., vol.31, No.2, pp.264-271, 2003. [7] V. Bajaj, C.Farrar, M. Hornstein, I. Mastovsky, JVieregg, J.Bryant, B.Elena, K.Kreischer, R.Temkin, and R.Griffin” ”Dynamic nuclear polarization at 9 Tesla using a novel 250 GHz gyrotron microwave source”, J. Mag. Res, 160(2), pp.85-90, Feb.2002. [8] Kwo Ray Chu Michael .E. Read and Achintya K. Ganguly . “Method of efficiency enhancement and scaling for the gyrotron oscillator,” IEEE Transaction on Microwave theory and Techniques, Vol-MTT-28, No.4, pp.318-324, 1980. [9] Nguyen, and Victor L. Granatstien, “Nonlinear theory of the Gyro-TWT: comparison of analytical method and numerical code data for the NRL Gyro-TWT,” IEEE transaction on plasma sciences, Vol. 30 No. 3, pp. 1186-1195, 2002. [10] S. Chosh et al. “A new approach for dispersion characteristics and Interaction Impedance for a helical slow- wave structure used in a practical TWT,” IEEE Journal of Research, Vol. 47, No. 3&4, pp. 145 -151, 2001. [11] M. Yeddulla, G. Nusinovich andT. Antonsen, “Start currents in an over mode gyrotron,” Phys. Plasmas, Vol.1, No 11, pp.4513-4520, 2003. [12] Kreischer K, D, B, Woskoboinikow, P, Muligan W, Temkin R “Frequency pulling and band width measurements of a 140GHz Pulsed gyrotron,” In J Elec Dec; 57( 6) 851-862, 1984. [13] Hornstein et al. “Continuous- wave operation of a 460-GHz second harmonic gyrotron oscillator,” IEEE transaction on plasma sciences, Vol. 34, No. 3, pp.524-533, 2006. [14] M. K. Hornstein et al., “Second harmonic operation at 460 GHz and broadband continuous frequency tuning of a gyrotron oscillator,” EEE transaction on Electron Devices, 2004. [15] Milissa K. Hornstein, “Design of 460 GHz Second harmonic gyrotron for use in dynamic nuclear polarization,” M.Sc. Thesis, Massachusetts Institute of Technology. Cambridge USA , Massachusetts 2001 | ||
|
Statistics Article View: 356 PDF Download: 260 |
||