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Quasi-optical mode conversion device and method of terahertz multimode frequency adjustable gyrotron

A mode conversion and gyrotron technology, applied in the field of vacuum electronics, can solve the problems of working on a single mode or discrete frequency points, unable to realize multi-mode broadband and other problems, and achieve the effect of high-efficiency quasi-optical mode conversion

Active Publication Date: 2018-06-08
PEKING UNIV
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Problems solved by technology

[0004] In view of the demand for mode conversion of the current multi-mode frequency-tunable gyrotron and the inability of the existing quasi-optical mode conversion device to realize multi-mode broadband work, the present invention provides a quasi-optical mode of a terahertz multi-mode frequency-tunable gyrotron The conversion device and its conversion method solve the problem that the existing broadband quasi-optical mode conversion device can only work on a single mode or a discrete frequency point, thereby solving the mode conversion problem of the multi-mode frequency adjustable gyrotron

Method used

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  • Quasi-optical mode conversion device and method of terahertz multimode frequency adjustable gyrotron

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Embodiment Construction

[0032] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0033] Such as figure 1 As shown, the quasi-optical mode conversion device of the terahertz multimode frequency tunable gyrotron in this embodiment includes: a waveguide radiator 1, a quasi-elliptical shaped reflector 2, a bifocal parabolic reflector 3, a planar reflector 4 and an output window 5.

[0034] The mode selected in this example is TE 11,2 ,TE 12,2 ,TE 13,2, satisfying the characteristics of the same radial index, high-order angular index and continuous change, the cross-sectional diagram of the mode is as follows figure 2 shown.

[0035] According to the selected mode, determine the frequency range of each mode so that the angle θ between the beam and the vertical axis B The variation range is less than 2°, and the different modes have nearly the same θ B variation range. θ B The expression is:

[0036]

[0037] A...

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Abstract

The invention discloses a quasi-optical mode conversion device and a quasi-optical mode conversion method of a terahertz multimode frequency adjustable gyrotron. The high order electromagnetic beams with different modes and different frequency are effectively radiated by using a waveguide radiator, and the device works at multiple waveguide modes and each mode has high tunable bandwidth; a quasi-ellipse shape reflector performs angular focusing on high order electromagnetic beams; a bifocal parabolic reflector performs axis focusing on the electromagnetic beams to form multi-mode frequency tunable Gaussian beams, after the directions of the beams are adjusted via a plane reflector, the beams are output via an output window positioned at the waist of the Gaussian beams. According to the device and the method provided by the invention, the problem that the quasi-optical mode conversion device of the terahertz multimode frequency adjustable gyrotron cannot synchronously work under the multiple broadband modes is solved, the device and the method are applicable to the terahertz multimode frequency adjustable gyrotron, and the efficient quasi-optical mode conversion can be achieved on the broadband range of the multiple modes in the gyrotron.

Description

technical field [0001] The invention relates to the field of vacuum electronics, in particular to a quasi-optical mode conversion device and a conversion method for a terahertz multi-mode frequency adjustable gyrotron. Background technique [0002] The gyrotron based on the electronic gyrotron maser mechanism can generate high-power electromagnetic energy. It is currently the highest-power electric vacuum device working in the terahertz frequency band. It has a wide range of applications in military, materials, and biomedical fields, such as long-distance high-resolution Radar, material processing and modification, biological non-destructive testing, controlled thermonuclear fusion reactor heating and other applications. The traditional gyrotron generally works at a fixed frequency point, which is difficult to meet the requirements of dynamic nuclear polarization nuclear magnetic resonance (DNP-NMR), plasma heating to suppress the instability of magnetic fluid, etc. The appe...

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Application Information

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IPC IPC(8): H01P1/16
Inventor 杜朝海边慧琦潘石刘濮鲲
Owner PEKING UNIV
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