Electromagnetic Pulse Drive Sleeve Implosion Compression Magnetization Target Research

As the two main implementations of controlled thermonuclear fusion-inertial confinement fusion(ICF)and magnetic confinementfusion(MCF),some breakthroughs have been made in recent years.The researchers began to explore the new path of fusion which’s parametersbetween the plasma parameters of MCF anf ICF,and proposed magnetic inertial confinement fusion program(Magneto-Inertial Fusion,MIF),combined with the advantages of both,meanwhile by magnetization to reduuce the thermal conductivity,a magnetic field inhibits the transport of a particles out of the burning fuel,so that fuel is easier to achieve fusion ignition conditions.In recent years,including the magnetized target fusion(MTF)program proposed by the Los Alamos National Laboratory(LANL)and the Air Force Research Laboratory(AFRL),the FRC collision experiment program of Tri alpha energy company on the C-2 device,the magnetized liner Inertial fusion(MagLIF)program of Sandia National Laboratory(SNL),the liquid metal implosion and compression magnetization target program of Canadian General Fusion company and many other MIF programshad achieved some gratifying results.MagLIF have a huger potential for neutron production for experimentsthan other indirect drive programs than Z-pinch dynamic hohlraum(ZPDH)and double-ended hohlraum(DEH),etc.In this paper,we mainly use MagLIF and FRC as an example to establish the relevant physical models.We combine the equations of the electromagnetic drive liner and the finite difference numerical solution of magnetic fluid to solve some problems.The analysis and simulation indicates that we can acquire obvious heating-up(about 4keV)by selecting appropriate embedded magnetic field and preheat temperature for target.The results shows that the implosion process parameters are up to the following conditions:the electron temperature plasma(50keV),pressure(of 10 Mbar),the particle number density(1024cm-3).The liner material have a major impact to the confined time and ignition conditions;at the same time,the electronic thermal conductivity is reduced more than 100 times than it in the absence of a magnetic field when the magnetic field is greater than 5T,the ion thermal conductivity had also a significant decrease in the compression peak.The alpha particle energy deposition density in the 5T embedded magnetic field is relatively increase of more than about 200 times than it in the 1T embedded magnetic field.Magnetized also hinder implosion compression process with a certain extent.The shock process would be analyzed in the compression process and the constraint time of MagLIF would be defined.And then verify the correctness of the code,we use the code on the MagLIF program for numerical simulation.simulation results show the implosion velocity reaches 8cm/μs,the peak magnetic field reaches 500T,the plasma peak temperature exceeds 10keV,the plasma peak densityexceeds 100g/cm3 in the process of implosion,and the plasma peak density reaches 500 g/cm3 in the high gain MagLIF scheme which is even close to the ICF Plasma peak density.This shows that there is a great potential for plasma-constrained ignition using an electromagnetically directly driven liner implosion.It is shown that the model is qualitatively consistent with the theoretical analysis for FRC’s adiabatic wall compression.We also find that the adiabatic approximation during the axis contraction motion is valid when the classical transport regime is applied inside separatrix of FRC.