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检索条件"机构=State Key Lab of Advanced Electromagnetic Engineering Technology"

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External Resonant Magnetic Field Experiments Impacting on MHD Activities on J-TEXT Tokamak

External Resonant Magnetic Field Experiments Impacting on MH...

引用

第十五届全国等离子体科学技术会议

作者： Rao Bo Ding Yonghua Zhang Ming Zhuang Ge Jin Wei Nan Jieyin He Yan Yu Kexun State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT Huazhong University of Science and Technology Abstract WuhanChina 430074

Recently,a static magnetic perturbation field system consists of 5 saddle coils has been installed,and experiments of RMP impacting on locked mode and MHD suppression are *** 1.5 Gs threshold of extemal RMP to lock 2/1 mode at a certain discharging parameter is goffen,while the toroidal field is about *** shows that the RMP is very helpful to suppress MHD oscillation at relatively low toroidal field and plasma ***,it strongly depends on the spatial phase of external field,and the effects on MHD activity are thought to be the combined result of external RMP and intrinsic error *** the meeting,we will give a detailed description of experiments and a simple analysis based on the calculation of magnetic field of the coils.

关键词： RMP error field locked mode MHD

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Observation of the positive leader propagation in the inverted rod-plane gap

Observation of the positive leader propagation in the invert...

引用

Asia-Pacific International Conference on Lightning (APL)

作者： Hengxin He Nianwen Xiang Shanqiang Gu Jiahong Chen Weijiang Chen Shijun Xie Junjia He The State Grid Electric Power Research Institute Wuhan China The State Grid Corporation of China Beijing China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The characteristics of the positive leader propagation in the inverted rod-plane gap are investigated in this paper. The discharge experiments in a 3-m inverted rod-plane gap were carried out under switching impulse voltage. The positive leader propagation process was recorded by using a high speed CCD camera. The aspects to describe the positive leader propagation characteristics of the inverted rod-plane gaps are obtained and compared with the traditional rod-plane gaps. The critical corona radius and continuous leader inception voltage of rod derived in the 3-m inverted rod-plane gap are lower than that of the traditional rod-plane gaps.

关键词： Corona Cameras Air gaps Electrodes Atmospheric modeling Discharges Switches

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Observation on the attachment processes of competition tests under switching impulse voltage

Observation on the attachment processes of competition tests...

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Asia-Pacific International Conference on Lightning (APL)

作者： Shijun Xie Hengxin He Junjia He Weijiang Chen Jiahong Chen Shanqiang Gu Nianwen Xiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Corporation of China Beijing China State Grid Electric Power Research Institute Wuhan China

The attachment processes of competition tests under switching impulse voltage were studied in this paper. A series of competition tests with rod-rod gap configuration for these studies were carried out. In these competition tests, a high-speed CCD video camera was used to clarify the attachment processes, assisting by current measurement of the grounded rods and the voltage measurement of the discharge gap. The experimental results indicated that the processes can be divided into two stages related to the downward discharge and the upward discharge respectively, both in positive and negative competition tests. However, the scale of the two stages and the discharge process in the two stages are different, and these differences affect the striking probability finally.

关键词： Discharges Lightning Switches Electrodes Current measurement Charge coupled devices Cameras

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3D Channel tortuosity of long air gap discharge

3D Channel tortuosity of long air gap discharge

引用

Asia-Pacific International Conference on Lightning (APL)

作者： Shanqiang Gu Nianwen Xiang Jiahong Chen Weijiang Chen Shijun Xie Junjia He The State Grid Electric Power Research Institute Wuhan China State Grid Corporation of China Beijing China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The geometric form of the leader trajectory is an interesting aspect of long air gap discharge research. In this paper, the 3-D discharge channel tortuosity in 3m rod-plane gaps is obtained by following steps: Firstly, using two static cameras fixed orthogonally to record the face photo and the side photo of the discharge channel. Secondly, the 3-D discharge channel is reconstructed by employing image recognition technology. Thirdly, the discharge channel tortuosity in two-dimensional space and three-dimensional space are derived respectively, which satisfied the Gaussian distribution law. The statistical results indicate that the channel tortuosity will be conservatively estimated by using a two-dimensional method. Statistical results of the channel tortuosity with three-dimensional method indicate the following conclusions. The angle between the discharge channel segments and the gap axis meets the distribution of rational function and its average value and standard deviation is 23.8° and ±19.0° respectively; the angle between the adjacent channel segments also meets the distribution of rational function, and its average value and standard deviation is 13.3° and ±9.9°.

关键词： Discharges Image reconstruction Sparks Probability Cameras Time frequency analysis Face

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Stress and Thermal Analysis of In-Vessel Resonant Magnetic Perturbation coils on J-TEXT Tokamak

Stress and Thermal Analysis of In-Vessel Resonant Magnetic P...

引用

第十五届全国等离子体科学技术会议

作者： Hao Changduan Zhang Ming Jng Yonghua Rao Bo Cen Yishun Zhuang Ge State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT Huazhong University of Science and Technology Wuhan 430074 Hubei Province China

A set of 4 in-vessel saddle coils are designed to generate a helical field onJ-TEXT tokamak to study the influences of external perturbation field to *** will be fed with alternating currents up to 1 0 kA at frequencies up to 1 0 *** the special structure,thermal environment and limited space in the vacuum chamber,it is of great essential to make sure that the coils will not be damaged whenundertaking the huge electromagnetic forces in the strong toroidal field and theirtemperatures don’t rise too much to destroy the insulation.A 3D finite element modelis developed by the ANSYS code in this paper,stresses are analyzed in the worstcondition,then a mounting method is *** results of the elastic and modalanalyses show that the mounting method meets the strength *** that,athermal analysis is performed to study the cooling process and the temperaturedistribution of the coils.

关键词： J-TEXT tokamak resonant magnetic perturbation coils finite element analysis

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Design of An Air-core Transformer Used for Pulse Current System

Design of An Air-core Transformer Used for Pulse Current Sys...

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第十五届全国等离子体科学技术会议

作者： LI Xingqun Zhang Ming Liu Minghai Zhuang Ge Chang Jiang Deng Shan State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT Huazhong University of Science and Technology Wuhan 430074 Huibei ProvinceChina

Pulse current technology has been widely used in plasma *** the low rate of rise of on-state current,the ordinary thyristor can be rarely used in pulse current *** order to reduce the requirement of current rising rate of the switch,in this *** design a cylindrical air-core transformer for pulse plasma systems whose load can be usually equivalent to an inductor of low *** to the cored *** has the advantages of simple structure and no *** verifying the feasibility,we set up a testing system which consists of a 2.5kV/20μF capacitor,an ordinary thyristor and an air-core transformer which is shorted with an essentially inductive wire in the *** this *** the capacitor is discharged via the switch,the rate of current rising of the primary and secondary windings is 37A/μs and 138A/μs ***,the current rising rate of switch is 3.73 times lower than the load while the designed value is *** to the result of experiment,it is proved that making use of air-core transformer is an effective way to decrease the requirement of current rising rate of the switch.

关键词： plasma air-core transformer thyristor pulse power system

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Mirnov coils system on the J-TEXT tokamak

Mirnov coils system on the J-TEXT tokamak

引用

第十五届全国等离子体科学技术会议

作者： HE Yan DING Yonghua JIN Xuesong CHEN Zhenzhen ZHUANG Ge PAN Yuan CHINA-USA Joint Fusion Laboratory J-TEXT Huazhong University of Science and TechnologyWuhanChina 430074 State Key Laboratory of Advanced Electromagnetic Engineering and Technology WuhanChina

Two poloidal arrays and a toroidal array of Mimov coils are developed on the J-TEXT tokamak to measure the magnetic fluctuations and study external MHD *** the Mimov coils data,the mode StnlCture and frequency can bc detected and analyzed for the J-TEXT *** Singular Value Decomposition (SVD) technique has been successfully applied to the Mimov coils data to determine (m,n) of the mode.

关键词： J-TEXT Mirnov coils magnetic fluctuation mode structure

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Particle size control of silver nanoparticles prepared by pulsed wire discharge in liquid media

Particle size control of silver nanoparticles prepared by pu...

引用

International Symposium on Multifunctional Ceramic Materials Based on Nanotechnology, ISMCN 2010

作者： Tokoi, Y. Josho, K. Izuari, Y.M. Suzuki, T. Nakayama, T. Suematsu, H. Lee, W. Fu, Z. Niihara, K. Extreme Energy-Density Research Institute Nagaoka University of Technology Niigata 940-2188 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea Republic of State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Silver nanoparticles were prepared by pulsed wire discharge (PWD) using silver wire in deionized water at various relative energy (K) from 10 to 98, which is ratio of the charged energy of the capacitor in the electrical circuit to the vaporization energy of the wire. From energy deposition calculated by the measured voltage and current waveforms, deposited energy of the wire was increased with increasing K. From X-ray diffraction (XRD) analysis, prepared nanoparticles were phase identified as silver. From transmission electron microscopy observations, the shape of prepared silver nanoparticles were spherical and the median particle diameter (D50) and the geometric standard deviation (σg) were calculated from the particle distribution. D50 was decreased from 34 to 19 nm with increasing K. The particle size in prepared by PWD in liquid media can be controlled by K.

关键词： Silver nanoparticles

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Residual stress relaxation of cubic boron nitride thin films deposited in Ar with other noble gases

Residual stress relaxation of cubic boron nitride thin films...

引用

International Symposium on Multifunctional Ceramic Materials Based on Nanotechnology, ISMCN 2010

作者： Ohori, T. Shirahata, J. Suzuki, T. Nakayama, T. Suematsu, H. Lee, S.W. Fu, Z. Niihara, K. Extreme Energy-Density Research Institute Nagaoka University of Technology Niigata 940-2188 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea Republic of State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A novel method based on radio frequency magnetron sputtering tailored to the deposition of low residual stress and adherent c-BN thin films on silicon substrates was developed. In this study, the effect of noble gas (Kr, Ar, Ne and He) added in Ar gas during sputtering on the residual stress and the c-BN content has been investigated. As a result, it was found that the residual stress of c-BN thin film decreased with increasing the helium gas flow rate within argon gas.

关键词： Residual stresses

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A double C-shaped three-dimensional metamaterial absorber

A double C-shaped three-dimensional metamaterial absorber

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第十五届全国等离子体科学技术会议

作者： Guodong Wang Minghai Liu Xiwei Hu Xiaoqin Song State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People''s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and TechnologyHuazhong University of Science and TechnologyWuhan 430074People''s Republic of China School of physics Huazhong University of Science and TechnologyWuhan 430074People''s Republic of China School of physicsHuazhong University of Science and TechnologyWuhan 430074People''s Republic of China

The absorbing property of a three—dimensional metamaterial operating at 12.7GHz is investigated numerically by the model of double C-shaped metallic stripes,which are printed on the each side of a dielectric cube *** carefully adjusting the dimensions of the metamaterial structure,the metamaterial simultaneously has both negative electric and magnetic response to an incident electromagnetic(EM)wave,and can exhibit left—handed property in a frequency rang with negative permittivity and permeability ***,Full-wave EM simulation demonstrates that it carl achieve over 99.6%absorption at 1 2.7GHz with a 0.4GHz full width at half *** metamaterial structures are scalable to operate a significant portion of the EM spectrum spanning from radio to the near optical *** metamaterial can ease design and fabrication,especially at high *** proposed absorber possesses many potential applications such as bolometer,sub—wavelength imaging,and microwave absorption.

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