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Calculation of plasma radiation in Electrothermal-Chemical Launcher

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Calculation of Plasma Radiation in Electrothermal-Chemical L...

Discharge and post-explosion behaviors of electrical explosion of conductors from a single wire to planar wire array

第十六届全国等离子体科学技术会议暨第一届全国等离子体医...

作者： Yong Jin Baoming Li National Key Laboratory of Transient Physics Nanjing University of Science and Technology

A numerical model of the radiation has been employed by a Monte Carlo method and statistical physics to simulate the process of a capillary plasma source for Electrothermal-Chemical(ETC) *** effect on propellant grains with different average absorption coefficients is *** plasma-propellant interaction is also discussed when combined with a thermal *** show that the strong instantaneous radiation is responsible for the transmission of energy to the propellant grains leading to *** efficiency of energy absorption in the propellant bed always maintains a high *** energy caused by plasma is concentrated around the plasma *** "hot zone" efficiency is mainly effected by the properties of propellant grains within a small field around the plasma injector.

关键词： Electrothermal-chemical launch Monte Carlo method plasma radiation

来源： cnki会议评论

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plasma Science and Technology 2022年第1期24卷 151-164页

作者：李琛韩若愚刘毅赵锦林王亚楠何锋欧阳吉庭 Research Center for Electrostatics and Applications Beijing Institute of TechnologyBeijing 100081People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710049People’s Republic of China

This work deals with an experimental study of a Cu planar wire array(PWA)in air and water under the stored energy 300-1200 J.A single Cu wire is adopted as a controlled *** configurations of PWA and a wire with the same mass(cross-section area)but the different specific surface areas(15-223 cm^(2)g^(-1))are *** transient process is analyzed using high-speed photography in combination with the results of optical emission and *** characteristics revealed that PWA always has a higher electric power peak,early but higher voltage peak,as well as faster vaporization and ionization process than the single-wire *** to three times stronger optical emission could be obtained when replacing the single-wire with PWA,indicating a higher energy-density state is ***,in both air and water,single-wire load tends to develop a transverse stratified structure,while PWA is dominated by the uneven energy deposition among ***,the synchronism and uniformity of the PWA explosion are discussed.

关键词： electrical explosion wire array metal plasma plasma radiation shock wave

Density and impurity profile behaviours in HL-2A tokamak with different gas fuelling methods

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Chinese Physics B 2009年第8期18卷 3473-3483页

作者：崔正英周艳李伟冯北滨孙平董春凤刘仪洪文玉杨青巍丁玄同段旭如 Southwestern Institute of Physics

The electron density profile peaking and the impurity accumulation in the HL-2A tokamak plasma are observed when three kinds of fuelling methods are separately used at different fuelling particle locations. The density profile becomes more peaked when the line-averaged electron density approaches the Greenwald density limit nG and, consequently, impurity accumulation is often observed. A linear increase regime in the density range ne 〈 0.6nG and a saturation regime in ne 〉 0.6nG are obtained. There is no significant difference in achieved density peaking factor fne between the supersonic molecular beam injection （SMBI） and gas puffing into the plasma main chamber. However, the achieved fne is relatively low, in particular, in the case of density below 0.7nG, when the working gas is puffed into the divertor chamber. A discharge with a density as high as 1.2nG, i.e. ne ： 1.2nG, can be achieved by SMBI just after siliconization as a wall conditioning. The metallic impurities, such as iron and chromium, also increase remarkably when the impurity accumulation happens. The mechanism behind the density peaking and impurity accumulation is studied by investigating both the density peaking factor versus the effective collisionality and the radiation peaking versus density peaking.

关键词： plasma radiation impurity accumulation density peaking

Improvement of the Uniformity of Surface Barrier Discharge in Atmospheric Nitrogen by Spark Discharge

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plasma Science and Technology 2010年第6期12卷 668-672页

作者：高亮齐冰黄建军汝丽丽 Applied Low Temperature plasma Laboratory Shenzhen Key Laboratory of Sensors TechnologySchool of PhysicsShenzhen University

A spark generator was employed to assist surface barrier discharge （SBD） in nitrogen at atmospheric pressure. The influence of spark discharge on the SBD electrical behavior is investigated by means of volt-ampere characteristics. Also, the electron density of plasma in the filament of each SBD arrangement is determined by plasma radiation method. It is found that the filaments in spark-assistant SBD are much stronger, while the corresponding mean electron density is much lower. Results show that the spark generator can improve the uniformity of SBD in atmospheric nitrogen in a particular range of applied frequency.

关键词： surface barrier discharge spark preionization plasma radiation ion density