Development Of Key Components Of Helical Wave Plasma Device And Experimental Study Of Turbulent Transport Characteristics

Edge plasma turbulent transport and Plamsa Material Interaction(PMI)are two major challenges in the field of magnetic confined fusion.These two topics are closely-related with each other and shapes boundary plasma characteristics,which greatly influ-enced core plasma parameters.More detailed research on these topics are necessrary.Large takamaks are very expensive to build,operate and maitain,and they pro-vived limited chances for experiments.Also,diagnostics in tokamaks are difficult and resitricted by various factors.Linear Plasma Devices(LPD),which are much cheaper and faster to build and easy to operate,can achieve stable discharge and allow precise diagnistics for entire plasma corsssection and can serve as useful complement for toka-maks.In this thesis,a a newly-built linear plasma deviec named Linear Experimental Advanced Device(LEAD)is introduced.To satisfy the needs of turbulence and PMI experiments,the vacuum chamber consists of two sections of different diameters.Ac-celerated ion beam,laser beam or PMI related diagnostics can be installed in the joint part of two sections.To generate a uniform axial magnetic field under the constraints of vacuum chamber geometry,cooling and power capacity,the size,location,turns and currents of the magnets system are optimized by computer simlulation.After optimiza-tion,the 15 magnets can produce a unifrom 0.2 T magnetic field with ripple less than 2.5%.A large-diameter multi-ring planar helicon plasma source was developed to sat-isfy the demands of precise radial scan measurement and a whole first-wall component.High-density large-diameter plasam column can be produces efficiently in a vast range of external parameters,including RF power,magnetic field and neutral pressure.Maximum density is over 1019 m-3 with 3 kW of power while its production effi-ciency is much better than most ohter helicon sources.Turbulent transport of particle and momentum was studied with a probe array,showing that 1 kHz low frequency tur-bulence plays a dominant role in particle transport.An large inward radial particle flux was formed in certain radial location.The radial transport of momentum forms aE × B flow with strong shear,which could reduce particle flux.Turbulent particle flux and the transport barrier caused by E × B flow shear forms the peaked radial density profile.