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Investigation of Klystron Asymmetric Double-gap Output Cavities and Output Circuit

Author: LiuHaiXu
Tutor: LinFuMin
School: Guangdong University of Technology
Course: Physical Electronics
Keywords: Asymmetric two - gap resonator Coupling High-order mode π - mode Characteristic impedance Output circuit MAGIC
CLC: TN122
Type: Master's thesis
Year: 2011
Downloads: 23
Quote: 2
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Abstract


This thesis outlined the importance of the study of the klystron output circuit and the existing problems on the one hand, and on this basis proposed work and with Isfe13D software simulation mode TM010 cylindrical asymmetric coupled double-gap resonator output structure, The calculated design methods, more precisely 1.25GHz, 3 GHz and 5-GHz frequency conditions given the π mode 2p mode gap electric field strength with the gap distance relationship, and further MAGIC particle simulation; On the other hand, TM310 cylindrical cavity coupled rectangular waveguide output circuit. First, in the center operating frequency of 1.25GHz, the simulation software through the electromagnetic field under conditions 3.OOGHz 5GHz asymmetric cavity draw ratios in the two gap width for the π-mode, two-gap induction electric field strength substantially equal to the size of the two gap sensing voltage substantially equal to the size of, For 2π mold,. The gap voltage of the cavity and by the equivalent circuit theory to analyze the results obtained are consistent with software simulation results. Secondly, in accordance with the electromagnetic field distribution of the cavity, one-dimensional analysis of the problem, the use of kinematic theory by theoretical calculations to derive the the asymmetric double gap output cavity corresponding to the best output power gap gap and drift tube formula for calculating the optimum length. Again, the use of the MAGIC particle simulation software to work double-gap π-mode 2p mode in case of symmetric and non-symmetric cavity particle simulation. When the electron beam acceleration voltage V0 = 30kv, electron beam current I = 30A, center operating frequency f = 3.00GHz, focusing magnetic field B = 0.6TASLA, the gap symmetry and asymmetric particle simulation confirmed the double-gap non- more advantages than the double-gap symmetric cavity the symmetrical cavity in improving the klystron output power. Finally, designed for multi-beam klystron TM310 high-order mode cylindrical cavity coupled rectangular waveguide output circuit, the center frequency of the work 7585.3MHz calculated the cavity of each drift tube gap frequency characteristics of impedance, and the output circuit output bandwidth. The research results show that: under the conditions of the same frequency, using the cylindrical TM310 mode resonator volume is 7 times the volume of the cylindrical TM010 mode resonator; TM310 high-order mode the cylindrical resonator coupling rectangular waveguide, each of the drift compared to before the the tube characteristic impedance coupling a little change, but very close to the characteristic impedance of the coupled gap; reflection coefficient phase method and equivalent circuit method, the appearance of the output cavity quality factor were 154 and 160, the output center frequency 7585.3MHz lower than before coupling cavity resonance frequency 26.5MHz, the output bandwidth of about 3%, so the output circuit of this type is more suitable for high frequency segment narrow-band multi-beam klystron.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Vacuum Electronics > Microwave tubes > Klystron
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