High-power microwave polarization characteristic detection system and detection method

Abstract

The invention belongs to the magnetic confinement nuclear fusion technology, and particularly relates to a high-power microwave polarization characteristic detection system and method, and the system comprises a transmission line, a dual-mode directional coupler, a matched resistor, a transmission antenna, an orthogonal mode converter, and harmonic mixers, amplifiers, filters and attenuators on two split signal paths of the orthogonal mode converter. The two paths of square waves a and b are transmitted through the right-angle transmission line, one path of square wave is transmitted to the orthogonal mode converter through the transmission antenna and is divided into two paths of signals, and the other path of square wave is mixed with the signals output by the local oscillator source when passing through the harmonic mixer A and the harmonic mixer B through the local oscillator source and the power divider; finally, electric field components in the horizontal direction and the vertical direction are obtained and converted into microwave polarization characteristics. The system and the device can efficiently and stably detect the high-power microwave polarization characteristic, and avoid damage caused by direct electrical connection between a microwave device and a transmission line.

Description

technical field [0001] The invention belongs to magnetic confinement nuclear fusion technology, in particular to a high-power microwave polarization characteristic detection system and detection method. Background technique [0002] Electron cyclotron resonance heating is an important plasma heating method. The microwave and plasma coupling efficiency is related to the annular magnetic field, plasma density, microwave incident angle and microwave polarization characteristics. [0003] In electron cyclotron resonance heating systems, the strategy of matching the polarization characteristics of microwaves with the annular magnetic field, plasma density, and microwave incident angle is usually used to achieve efficient coupling between microwaves and plasmas. [0004] In order to ensure the efficient coupling of microwave and plasma, the polarization characteristics of microwave can be changed by adjusting the polarizer on the transmission line to achieve the ideal polarizatio...

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Problems solved by technology

[0005] Due to the high frequency and high power of microwaves in the electron cyclotron resonance heating system, directional couplers are generally used to analyze a small part of the microwaves. First, it is difficult to effectively and quickly analyze the polarization characteristics of microwaves. Second, usually microwave devices are directly connected to directional The coupler connection causes the microwave device to be directly electrically connected to the transmission line of the electronic gyro system, and it is often easy to burn out the microwave device

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