Numerical Investigation Of Electromagnetic Constraint And Collisional Motion Of High Energy Particle Beams On Spacecraft

High energy particle beams have outstanding application potential in space debris removal,controlled nuclear fusion,particle beam weapons and particle thrusters.Especially,the non-contact particle beam removal technology is a hot research topic at the field of space debris removal in recent years.And there are still many difficulties and problems need to be solved at the traditional method of ion beam jet to clear space debris.The main difficulty is greatly influenced by the magnetic field,because the earth’s magnetic field interference to the range and precision of ion beam brought great influence.But the neutral beam is not affected by magnetic field,and won’t cause divergence because the charge inter-atomic forces,relative ion beam jet clean up space debris method has a huge advantage.In order to obtain the ideal neutral beam,it is very important to study the electromagnetic constraint and collision motion of high energy particle beam.In this paper,we used a three-dimensional PIC/MCC electrostatic model to study the electromagnetic constraints and collision motion of high-energy particle beams in spacecraft.The physical processes such as particle motion under electromagnetic field,interaction between charged particles and self-negotiating electric field,collision motion between particles are simulated,and the neutralization process of high-energy ion beam is studied.The research work of this thesis includes:1.Firstly,the application background and research history of high-energy particle beam are introduced,and the application background and research value of high-energy particle beam are expounded.The basic principle of ion beam neutralization is introduced,and the research trends of ion beam neutralization at home and abroad are introduced.2.Three commonly used numerical methods for plasma numerical simulation research,namely fluid method,dynamic theory method and PIC/MCC method,are summarized.The advantages and disadvantages of these three methods are analyzed.3.The process of electrostatic 3D PIC/MCC algorithm is introduced in detail,and the difference format of each module is deduced and described in detail.It mainly includes: electrostatic field solution,particle motion solution,charged particle selfconsistent field solution,particle collision solution,and gives the flow chart of algorithm design.4.A solution program was developed based on the electrostatic three-dimensional PIC/MCC algorithm to simulate the collision motion and electromagnetic constraints of the particle beam.The physical process of the neutral beam generated by the collision between the ion beam and gas was analyzed,and the key performance parameters of the neutral beam,including the neutralization efficiency and divergence,were analyzed.Combined with the principle of magnetic mirror field,the effects of constrained magnetic field on the divergence of ion beam and neutral beam are studied.5.Combined with laboratory neutralization actual physical parameter of the air chamber,accelerate electrostatic field of ion beam produced by electrode was studied,the influence of the neutralization process is simulated for ion beam,ion beam,the different time obtained the distribution of neutral beam and electric potential,as well as the neutral gas indoor the neutralization efficiency of ion beam,neutral beam emittance.