Effects Of Radial Electric Field On The Confinement Of High Energy Particle In Compact Fusion Reactor

In this paper,the effect of radial electric field on the orbit of the high energy?particle was investigated and the confinement of plasma in different radial electric fields in the compact fusion reactor(CFR)machine was studied by employing test particle simulations.The radial electric field E_r in a magnetic confined machine,such as the compact fusion reactor(CFR),the field-reserved configuration(FRC),and the tokamak,plays an essential role in affecting the confinement properties of the high energy particles.The parallel velocities of the high energy particles will be accelerated or decelerated by applying a radial electric field,which could change the loss rate of the high energy particles in the magnetic confined machines.The first part of this paper focuses on the basic theoretical knowledge.In order to study the confinement of high-energy particles under the effect of radial electric field in CFR machine,the magnetic configuration of the CFR machine was constructed and the single particle drift motion and adiabatic invariant in electromagnetic field was introduced.Two kinds of algorithms for driving particles were used during the single particle simulation,unlike the fourth-order Runge-Kutta method RK4,the recently developed Boris method can strictly keep the energy conservation of high energy particles without radial electric field.The orbit of high energy?particle in compact fusion reactor is simulated accurately by numerically solving the equations of motion with the Boris Algorithm.By changing the strength of the radical electric field and the particles'radical locations in the middle plane of the CFR configuration,the confinement property of the high energy?particle was studied.The simulation results indicate that both the positive radial electric field and negative electric field can significantly affect the confinement of the high energy?particle.When the radial electric field was increased to a threshold,the high energy?particle could be confined in the central region of the CFR machine for a long enough time.Unfortunately,the particle confinement was not significantly improved by the oscillating electric fields,and it was difficult to improve particle confinement by adjusting the related parameters.The threshold of the radial electric field depends on the initial parameters of the confined particle.Systematic investigations of the radical electronic field effect will provide valuable guidance for improving the performance of the designed CFR machines.