Study On The Dynamic Characteristics Of The Self Organizing Process In A Dusty Plasma System

The study of the dynamic properties of the charged particles system has a very important significance in solving the problem of the interaction behavior of moving charged particles in complex plasma system.No matter in a simple self-consistent field or hybrid-field,the trajectory of charged particles and the distribution of the steady state are very important for its internal dynamics.In this thesis,we use molecular dynamics simulation method to study the dynamic characteristics of 2D dusty plasma system.Firstly,by setting the interaction potential of charged particles,we obtain the relationship between the shape of the distribution of steady-state charged particles and initial conditions,such as initial temperature,initial density etc..For the further study of dusty plasma system,we also change the parameter of potential energy.The different distribution of charged particles is obtained.We also investigate the relationship between the system structure function(such as the static structure factor,velocity autocorrelation function and pair distribution function)and the system parameters(such as initial temperature,initial density and potential energy).Finally,we give a summary of the thesis.In the first chapter,we make an introduction of the structure and the cause of plasma.Plasma as the fourth state of object,it has many interesting features.It is also the foundation of development of the dust plasma.Its internal basic characteristics can be used in dust plasma environment.The dust plasma's formation,research methods and the development process are introduced in this chapter.As the background environment of research contents of this paper,the interaction of the complex particles attracts many attentions.Because of the universal existence and the importance of the application,the dust plasma plays an important role in the development of the study of plasma.In this chapter,we introduce the researches of the dusty plasma,such as the experimental investigation,numerical simulation and theoretical calculation.In second chapter,the principle of the molecular dynamics simulation method,commonly used algorithm and structure function are introduced.Molecular dynamics simulation as one of useful simulation methods,it is also the important means used in studying the dust plasma system.It is time-saving,efficient,economic,convenient and providing rich information of results.The third and fourth chapters are the core content of the article,covering researches during the past two years.The content of the third chapter is self-consistent field dynamics characteristics of the charged particles system.In the reaction system containing pure particles environment,dust particles form distinct spatial distribution.In self-consistent field,the charged dust particles tend to form a rectangular shape clusters,or a few charged particles mutual coupling into small clusters.Under the effect of a single vertical force field,the ultimate-spatial distribution of charged grains get more ordered and concentrated along with density increasing.We also study the initial and terminal structure characteristics of dust particles distributed in space by analyzing of their static structure factor.The fourth chapter shows the investigation of the distribution of the charged particles with different external force.When charged particles move in the hybrid field,the steady-state distribution of the particles becomes very complex.Because of the action of attractive field,not only system environment will affect the particles' trajectory,but also do the different potential fields.In addition,the change of the environment parameter will affect the system structure.Compared to only self-consistent field,the steady states are more sensitive to the change of density and more easily consisted of globular,ring and dust particles.Chapter 5 is the summary of research results during my graduate life.I also put forward some new problems for future research and works.