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Experimental and modeling researches of dust particles in the HL-2A tokamak

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Chinese Physics B 2015年第2期24卷 313-319页

作者：黄治辉严龙文冨田幸博冯震程钧洪文玉潘宇东杨青巍段旭如 Southwestern Institute of Physics

The investigation of dust particle characteristics in fusion devices has become more and more *** the HL-2A tokamak,the morphologies and compositions of dust particles are analyzed by using scanning electron microscopy（SEM） and energy dispersive x-ray spectroscopy（EDX） with *** results indicate that the sizes of dust particles are in a range from 1 μm to 1 ***,stainless steel spheres with a diameter of 2.5μm-30 μm are *** production mechanisms of dust particles include flaking,disintegration,agglomeration,and *** addition,dynamic characteristics of the flaking dust particles are observed by a CMOS fast framing camera and simulated by a computer *** of the results display that the ion friction force is dominant in the toroidal direction,while the centrifugal force is crucial in the radial ***,the visible dust particles are accelerated toriodally by the ion friction force and migrated radially by the centrifugal *** averaged velocity of the grain is on the order of^100 m/*** results provide an additional supplement for one of critical plasma-wall interaction（PWI） issues in the framework of the International Thermonuclear Experimental Reactor（ITER） programme.

关键词： dust particles dust particle characteristics fast framing camera

Dynamics of dust in a Plasma Sheath with Magnetic Field

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Plasma Science and Technology 2007年第4期9卷 394-397页

作者：段萍刘金远宫野刘悦王晓钢 State Key Laboratory of Material Modification by Laser Electron and Ion BeamsDepartment of Physics and College of Advanced Science and TechnologyDalian University of TechnologyDalian 116024China College of Physics Science and TechnologyDalian UniversityDalian 116622China State Key Laboratory of Material Modification by Laser Electron and Ion BeamsDepartment of Physics and College of Advanced Science and TechnologyDalian University of TechnologyDalian 116024China

Dynamics of dust in a plasma sheath with a magnetic field was investigated using a single particle model. The result shows that the radius, initial position, initial velocity of the dust particles and the magnetic field do effect their movement and equilibrium position in the plasma sheath. Generally, the dust particles with the same size, whatever original velocity and position they have, will locate at the same position in the end under the net actions of electrostatic, gravitational, neutral collisional, and Lorentz forces. But the dust particles will not locate in the plasma sheath if their radius is beyond a certain value.

关键词： plasma sheath magnetic field dust particles

Global dust density in two-dimensional complex plasma

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Chinese Physics B 2024年第6期33卷 445-450页

作者：赵逸真刘松芬孔伟杨芳 School of Physics Nankai UniversityTianjin 300071China College of Science Civil Aviation University of ChinaTianjin 300300China

The driven-dissipative Langevin dynamics simulation is used to produce a two-dimensional(2D) dense cloud, which is composed of charged dust particles trapped in a quadratic potential. A 2D mesh grid is built to analyze the center-to-wall dust density. It is found that the local dust density in the outer region relative to that of the inner region is more nonuniform,being consistent with the feature of quadratic potential. The dependences of the global dust density on equilibrium temperature, particle size, confinement strength, and confinement shape are investigated. It is found that the particle size, the confinement strength, and the confinement shape strongly affect the global dust density, while the equilibrium temperature plays a minor effect on it. In the direction where there is a stronger confinement, the dust density gradient is bigger.

关键词： dust particles quadratic potential two-dimensional mesh grid