Numerical study on a 0.4 THz second harmonic gyrotron with high power

Chaojun, Lei; Sheng, Yu; Hongfu, Li; Yinghui, Liu; Xinjian, Niu; Qixiang, Zhao
July 2013
Physics of Plasmas;Jul2013, Vol. 20 Issue 7, p072108
Academic Journal
Terahertz and sub-terahertz science and technology are promising topics today. However, it is difficult to obtain high power source of terahertz wave. In this paper, the mode competition and beam-wave interaction in a gradually tapered cavity are studied to achieve high efficiency of a 0.4THz second harmonic gyrotron in practice. In order to attain high power and stable radiation, the TE32,5 mode is selected as the operating mode of the desired gyrotron to realize single mode oscillation. The issues of studying on the high-order mode gyrotrons are solved effectively by transforming the generalized telegraphist's equations. The efficiency and output power of the gyrotron under different conditions have been calculated by the code, which is based on the transformed equations. Consequently, the results show that single mode second harmonic radiation with power of over 150 kW at frequency of 0.4 THz could be achieved.


Related Articles

  • Coverage dependent phase transition of pyridine on Ag(110) observed by second harmonic generation. Heskett, D.; Song, K. J.; Burns, A.; Plummer, E. W.; Dai, H. L. // Journal of Chemical Physics;12/15/1986, Vol. 85 Issue 12, p7490 

    Second harmonic generation from a Ag(110) surface is shown to be sensitive to submonolayer converages of O2, O, pyridine, and benzene. The second harmonic intensity as a function of exposure indicates that the orientation and bonding of pyridine adsorbed at 110 K changes at about 0.3 L.

  • Surface Ferroelectric Phase Transition in Multilayer Polymer Langmuir Films. Murzina, T.V.; Misyuryaev, T.V.; Fokin, Yu.G.; Palto, S.P.; Yudin, S.G.; Aktsipetrov, O.A. // JETP Letters;8/10/2003, Vol. 78 Issue 3, p129 

    The ferroelectric phase transition on the free surface of a polymer ferroelectric Langmuir–Blodgett film was studied by the optical second harmonic generation (SHG) technique. A hysteresis in the temperature dependence of the SHG intensity observed for a multilayer film of a...

  • Using Simultaneous Time-Resolved SHG and XRD Diagnostics to Examine Phase Transitions of HMX and TATB. Saw, C. K.; Zaug, J. M.; Farber, D. L.; Weeks, B. L.; Aracne, C. M. // AIP Conference Proceedings;2002, Vol. 620 Issue 1, p856 

    Simultaneous SHG (second harmonic generation) and XRD (x-ray diffraction) diagnostics have been applied to examine the phase behavior of energetic materials, HMX (octahydro-l,3,5,7tetranitro-1,3,5,7-tetrazocine) and TATB (1,3,5-triamino-2,4,6 trinitrobenzene). This unique capability provides...

  • The β–δ phase transition in the energetic nitramine-octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine: Kinetics. Smilowitz, L.; Henson, B. F.; Asay, B. W.; Dickson, P. M. // Journal of Chemical Physics;8/22/2002, Vol. 117 Issue 8, p3789 

    In this paper we present second harmonic generation (SHG) experiments designed to confirm the mechanism and quantify the transformation kinetics of the β-δ solid state phase transition in the organic nitramine molecule octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX). The β phase...

  • High-power second harmonic emission and frequency locking in a 28-GHz gyrotron. Danly, B. G.; Mulligan, W. J.; Temkin, R. J.; Sollner, T. C. L. G. // Applied Physics Letters;4/15/1985, Vol. 46 Issue 8, p728 

    Two important new results are presented from a study of second harmonic (2ωc) emission from a pulsed gyrotron designed for fundamental (ωc) emission of 200 kW at 28 GHz in the TE021 mode. Simultaneous output at ω1≊ωc and ω2≊2ωc, with the condition...

  • Phase Transition Diagnostic in Iron Telluride by Nonlinear Optical Experiments. Kityk, I. V.; Viennois, R.; Plucinski, K. // Acta Physica Polonica, A.;Apr2012, Vol. 121 Issue 4, p932 

    We have applied non-linear optical method (second harmonic generation (SHG) and third harmonic generation (THG)) to monitoring the phase transformation in the iron telluride compounds. The experiment was performed in the reflected geometry in which Temperature dependences of the SHG and THG have...

  • Temperature resolved second harmonic generation to probe the structural purity of m-hydroxybenzoic acid. Clevers, S.; Simon, F.; Dupray, V.; Coquerel, G. // Journal of Thermal Analysis & Calorimetry;Apr2013, Vol. 112 Issue 1, p271 

    We report the use of second harmonic generation (SHG) and temperature resolved second harmonic generation (TR-SHG) for in situ probing and monitoring the structural purification of m-hydroxybenzoic acid (MHBA). Pure and mixtures of the two polymorphic forms of MHBA (metastable Pna2 and stable...

  • Second harmonic generation in the paraelectric phase in powders and ceramics of BaTiO. Kovalevskii, V.; Malinovskii, V.; Pugachev, A.; Raevskii, I.; Raevskaya, S.; Rudych, P.; Surovtsev, N. // Physics of the Solid State;May2012, Vol. 54 Issue 5, p920 

    A second harmonic signal has been clearly observed in powders and ceramics of BaTiO in the high-temperature phase. The effect manifests itself at temperatures 500 K above the temperature of the phase transition from the tetragonal phase to the cubic phase, which is also significantly higher than...

  • Determination of the spatial profiles of all components of the quadratic susceptibility tensor $\hat \chi ^{(2)} $( z, 2ω; ω, ω) of a one-dimensionally inhomogeneous absorbing medium. Golubkov, A.; Makarov, V. // Journal of Experimental & Theoretical Physics;Apr2012, Vol. 114 Issue 4, p555 

    For a one-dimensionally inhomogeneous plate whose linear dielectric properties are also inhomogeneous and are characterized by a diagonal permittivity tensor, it is proved that the spatial profiles of all components of the complex quadratic susceptibility tensor $\hat \chi ^{(2)} $( z, 2ω;...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics