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The special three - mirror quasi - optical cavity gyrotron research

Author: LiWenPing
Tutor: LiuShengGang
School: University of Electronic Science and Technology
Course: Physical Electronics
Keywords: Terahertz Three-mirror Quasi-optical cyclotron Kinetic theory Particle simulation
CLC: TN12
Type: Master's thesis
Year: 2008
Downloads: 49
Quote: 1
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Abstract


Three-mirror quasi-optical cavity resonance system, a cross between the ordinary microwave resonant cavity with an optical resonant cavity between the development of new sources of electromagnetic radiation, terahertz radiation source is based on the high power vacuum electronics can play a huge role. The research objectives of this thesis is to explore the the terahertz band high-power, high-efficiency gyrotron. The quasi-optical cavity electron cyclotron maser instability combining is an important direction to achieve this goal. The major work of this paper are: 1. Studied a special mirror rotationally symmetric quasi-optical resonator system, and its detailed theoretical derivation. Explore the field distribution in the cavity, resonant conditions, using MATLAB analysis of the impact of field changes with various parameters, and also obtained the expression of energy storage cavity. Based on the Gyrotron the linear theory, the use of the Laplace transform residue Theorem seeking inversion method, under the framework of the linear Vlasov-Maxwell equations, the establishment of a special three-mirror quasi-optical cavity gyrotron kinetic theory. Export Note wave interaction power, frequency, and start-up current formula, and the numerical computation using MATLAB. The results show that this gyrotron work in the high-order harmonic conditions can have a higher interaction power, having a working potential of THz. According to the characteristics of the three-mirror quasi-optical cavity midfielder distribution, design a three-reflection mirror quasi-optical cavity cavity model, and particle simulation software on the computer simulation of the cold chamber cavity. Electromagnetic field distribution in the cavity of the test from the cold cavity field theory methods derived distribution, and both are in very good agreement. Using the designed cavity model, the introduction of the cyclotron electron beam, the computer simulation of the thermal chamber cavity, obtained in the fundamental mode frequency for 107.25GHz power of a 47.7KW the output wave. The higher harmonic working mode, obtain clocked 215.6GHz, the power of the output wave of the 129.33KW. The field distribution of the fundamental and second harmonic Gaussian distribution, are made in good agreement with the cold chamber test results. The results show that the high harmonic mode, this quasi-optical cavity gyrotron work really great advantage, in order to verify the theoretical derivation of the conclusions drawn. Therefore, this new type of quasi-optical cavity gyrotron millimeter submillimeter band has great potential, especially important in the development of high-power terahertz radiation source based on the mechanism of electron cyclotron maser.

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