Research Of A New Kind Of Magnetic Flux Compression Generator By Plasma Liners

Magnetic flux compression generator(MFCG)by plasma liners gives a possibility of power and current amplification on pulsed power systems,so it is worth to research and apply.A new kind of plasma MFCG was used on the MIG generator at the Institute of High Current Electronics(IHCE,Tomsk,Russia)and it indicates a significant effect of current amplification on pulsed power systems.This dissertation is devoted to the theory analysis,simulations and experiments of this new kind of generator.The main contents are as follows:0D model was used on the theory analysis of this new kind of MFCG and 0D numerical model with the parameters of MIG was developed to calculate the load current wave.It indicates that there are three stages in the MFCG working process: plasma liners acceleration stage,current switching stage and flux compression stage.The calculation result is close to the experimental result,so the 0D model used in the simulation of the MFCG working process is reasonable.This 0D model gives a proper reference to design this new kind of MFCG.Magneto-hydrodynamic(MHD)simulations were developed to obtain the variations of plasma density,plasma temperature and magneti c field in the MFCG working process.A circuit model was combined with the MHD simulations to obtain the driving current wave(primary)and the load current wave(secondary).It indicates that the geometry parameters of the groove in the new kind of MFCG effected the load current amplification: there is a proper position,a minimum wide and a minimum depth of the groove to optimize the current amplification.The experiments of the new kind of MFCG were done on the conditions similar with the ones of the MHD simulations.The current waves obtained in the experiments indicates that there are three stages which have been confirmed in the 0D model in the MFCG working process.It also indicates that the current amplification was effected by the geometry parameters of the groove and the initial plasma density: the conclusion of the effects of the groove is the same as that in the MHD simulations,and the lower the plasma density is,the higher the load current amplification factor is.The MFCG load current amplification factor was formulated by a group of equations.These equations combined with the experimental results of this dissertation and MIG indicates that the kinetic energy of the plasma liners and the ratio of two inductance(compression area and the load)are important to the load current amplification factor,and the efficiency of the current switching which is determined by the geometry parameters of the groove is less important.A rule to design this new kind of MFCG was formulated according to the conclusion above.