Online long-pulse high-power directional coupler performance testing device and method

Abstract

The invention discloses an online long-pulse high-power directional coupler performance testing device and method. The online long-pulse high-power directional coupler performance testing device comprises a high-power klystron system and a vector network analyzer, the output end of the vector network analyzer is connected with a micro-wave amplifier through a micro-wave switch, the output end of the micro-wave amplifier is connect with the high-power klystron system through a first direct current break device, the output end of the high-power klystron system is connected with a bi-directional coupler through a circulator, coupling output signals of the bi-directional coupler are accessed into the vector network analyzer through a micro-wave cable after passing an attenuator and the direct current break device, and the wave guide output of the bi-directional coupler is connected to a high-power water load. The online long-pulse high-power directional coupler performance testing device uses the network analyzer as a testing apparatus and uses the output signals (about 10 mW) of the network analyzer as an oscillation source of the klystron, through testing under different klystron output power and recording S21 parameters obtained by the vector network analyzer under a long-pulse (more than 1000 s) stable running condition, the global performance of the directional coupler is obtained.

Description

technical field [0001] The invention belongs to the field of performance testing equipment for high-power microwave devices in the order of hundreds of kilowatts, and in particular relates to an on-line testing device and method for the performance of long-pulse high-power directional couplers. Background technique [0002] At present, high-power microwaves are commonly used in tokamak devices at home and abroad for plasma heating and current driving. There are two sets of high-power microwave systems on the EAST superconducting tokamak device, 4MW / 2.45GHz and 6MW / 4.6GHz systems, and a single tube can reach 200kW, continuous wave (CW) and 250kW, continuous wave (CW) operation respectively. High-power microwaves are injected into the plasma, and its power measurement, control and standing wave protection are realized by monitoring the signal coupled to the directional coupler. Therefore, a directional coupler with excellent performance is very important for system measurement...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem that the power signal obtained by the two sets of high-power microwave systems on the EAST superconducting tokamak device is unstable when the microwave source is stable and the high-power long pulse is running, and proposes a long-pulse high-power directional An online test device for coupler performance, which is used to monitor the directional coupler in the high-power microwave system online to obtain the performance of the directional coupler under long-pulse high-power, so as to analyze the measurement error of the system during high-power long-pulse operation, and Provide reference for system improvement and optimization

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