Physical Design Of Multiple Plasma Simulation Linear Device(MPS-LD)

Seeking for the safety and clean energy to satisfy the growing requirement is a key challenge.How to realize the peaceful utilization of controlled fusion energy has become a hot topic in the work.As the most promising fusion device,tokamak produce a lot of heat and particles during operation,which need to be removed in time.The divertor target is the most intense plasma-material interaction area.The existing tokamak devices have some drawbacks in studying the plasma-material interaction,such as difficult to diagnosis,complicated environments.Due to its good diagnosis,controllable parameters,steady-state operation,the linear plasma experimental devices can be used to study plasma-surface interactions effectively.Based on the importance of above physical problems and the advantage of linear plasma device,we plan to design and build a linear plasma device,which called Multiple Plasma Simulation Linear Device(MPS-LD)to provide an experimental platform for the related investigation.The physical design of the key systems of MPS-LD device is carried out in the present thesis.The overall design is as follows:the main part of MPS-LD is a cylindrical vacuum chamber with the length of 3 m,which is composed of two parts with diameter of 0.4 m and0.6 m.11 coils is located outside of the vacuum chamber,which can generate an axial magnetic field of 0.3 T.The vacuum chamber is divided into three parts:plasma source chamber,auxiliary heating chamber and target chamber.The vacuum pressure is maintained to 10^-4 Pa through three-stage differentially pumped method,and the operational pressure is down to 10^-2 Pa.Plasma sources mainly include helicon wave and arc source with La B₆as cathode,with electron density up to 10¹⁸-10¹⁹ m^-3,which can meet different experimental requirement.In the auxiliary heating chamber,electron Bornstein wave heating and ion cyclotron resonance heating are used to effectively heat the electrons and ions.The plasma with the temperature of the electrons and ions up to 1-20 e V is expected.The compact torus installed in the target chamber can be used to simulate the critical problems such as fueling in tokamak.During the physical design process of the device,the author mainly participated in the design of the main components,responsible for magnet system design and magnetic field simulation,vacuum system design and vacuum demand calculation,and auxiliary heating system design.The first chapter mainly introduces the research background,content and significance.Chapter 2 mainly present the overview of MPS-LD,and expounds the basic parameters.Chapter 3 mainly shows the design of the magnet system and the magnetic field simulation process based on COMSOL Multiphysics software.The magnetic field with strength at the axis of 0.3 T and magnetic field ripple<3%are obtained.The basic parameters of the corresponding coils are determined.Chapter 4 introduces the design process of the vacuum system and the theoretical calculation for the vacuum requirement.Chapter 5 describes the design of the relevant theory for the auxiliary heating system,and obtains the magnetic field configuration and ion heating antenna required by the auxiliary heating.In chapter 6,the indispensable auxiliary systems and other experimental requirements are introduced.Chapter 7 mainly summarizes the main conclusion of the present thesis.