Lianmin Zhao

Research of aluminum nitride water load for the 4.6 GHz 500 kW LHCD system of the CFETR

Dingzhen Li, Liyuan Zhang, Lianmin Zhao, Fukun Liu et autres

To meet the increasing heating needs of the China Fusion Experimental Tokamak Reactor (CFETR), the output power in each Lower Hybrid Current Drive (LHCD) transmission line should be increased from 250kW to 500kW. Therefore, a new high-power water load must be developed …

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20kW Solid-state Microwave Source Control System at 915MHz for Microwave Plasma Reactor

Wendong Ma, Liang Zhu, Lianmin Zhao, Sheng Liu et autres

This paper presents the control system for 915MHz solid-state microwave source which is used to generate microwave discharge plasmas as needed. The system architecture of microwave source, and control system software design are described in detail. This solid-state microwave source control system …

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Design of the W-band smooth Gaussian radiator

Lianmin Zhao, Jianwei Liu, Xinjian Niu

In this paper, a smooth Gaussian radiator from a rectangular waveguide TE10mode to a circular waveguide HE11mode for W-band is proposed. The W-band smooth Gaussian radiator consists of two parts: one is to convert the TE10mode in the rectangular waveguide into the …

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Design of a new temperature compensating system for high power circulator of EAST LHCD system

Wei Li, Lianmin Zhao, Wendong Ma, Liang Zhu et autres

The existing temperature compensating unit (TCU) of high-power circulator of EAST LHCD system has some disadvantages, such as unstable operation, high price, complex structure and difficult installation. These disadvantages will affect the performance of circulator in high-power mode, and then affect the …

Error Analysis of Directional Coupler for Lower Hybrid Wave Power Measurement

Wendong Ma, Lianmin Zhao, Mao Wang, Fukun Liu et autres

Abstract As one of the important parameters for lower hybrid wave (LHW) systems with 24 4.6 GHz/250 kW continuous-wave klystron amplifiers, the microwave power needs to be accurately acquired in real time for the experimental advanced superconducting tokamak (EAST) experiment. A new …

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Design of an edge tapered 915 MHz/TM021 microwave plasma reactor by numerical analysis

Xinsheng Yan, Lianmin Zhao, Weiye Xu, Longwei Chen et autres

Microwave plasma reactor is often of particular interest due to their wide range of industrial applications, especially in high-end manufacturing. However, there exist problems of unstable plasma and small discharge area in conventional microwave reactors at 2.45 GHz. An edge tapered 915 …

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Design of a 324 MHz 200 kW CW Waveguide-to-Coaxial Adaptor for Radio Frequency Quadrupole Microwave System

Xinsheng Yan, Lianmin Zhao, B. Ding, Weiye Xu et autres

A 324 MHz 200 kW waveguide-to-coaxial adaptor has been designed and fabricated for a microwave coupler in a radio frequency quadrupole system. Optimization of the adaptor is performed by the numerical study and experimental test. High-power measurements show that the reflection coefficient …

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Design of C Band High Power Teflon Water Load

Dingzhen Li, Lianmin Zhao, Fukun Liu

Abstract A C band Teflon water load is designed for the 4.6 GHz lower hybrid current drive (LHCD) system in the experimental advanced superconducting tokamak (EAST) to absorb the high power microwave reflected from the circulator, Teflon is used to substitute traditional …

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Design and Test of 4.6 GHz 500 kW Continuous Wave 3 dB High Power Divider

Dingzhen Li, Lianmin Zhao, Fukun Liu, Min Cheng et autres

A 500-kW continuous-wave (CW) high-power 3-dB divider is designed for the 4.6-GHz lower hybrid current drive system in the Experimental and Advanced Superconducting Tokamak (EAST). A multistepped structure is used to increase the power capacity, and a water cooling structure is introduced …

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Optimize and design of coupling antenna for TM021 resonant cavity

Xinsheng Yan, Lianmin Zhao, Fukun Liu

A novel technique for coupling enhancement of coaxial antenna fed TM021resonant cavity is proposed in this paper. An inverted frustum section is inserted between the coaxial waveguide and the resonant cavity to improve coupling. The inverted frustum section acts as an impedance …

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Design of temperature compensating unit for the circulator in 6 MW 4.6 GHz LHCD system

Chengyao Peng, Jiafang Shan, Lianmin Zhao, Min Cheng et autres

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Specimen prepartion and micro-structure analysis of aluminum-magnesium alloy AZ91D

Lianmin Zhao

Magnesium is the lightest structural metal. Magnesium alloys have a hexagonal lattice structure, which affects the fundamental properties of these alloys. Plastic deformation of the hexagonal lattice is more complicated than in cubic latticed metals like aluminum, copper and steel. Therefore magnesium …