Spectral Diagnosis Of Ar-doped Implosions Core In The Inertial Confinement Fusion

In the inertial confinement fusion?ICF?,the temperature,density and spatial distri-bution of plasma in the implosion target are very important for the design of the target ball and the analyze of implosion process.Therefore,we need to diagnose the experimental spectrum by theoretical model to obtain the temperature and density of the plasma.Usu-ally,argon is doped in an implosion target as a tracer element,so we choose argon as the object of study in this work.In many cases,the plasma is difficult to achieve local thermodynamic equilibrium?LTE?.For example,non-Planck distribution of the radiation field,or for the optical thin plasma,the emitted photons are easy to escape so that the pos-itive and negative process which photon participated in can not achieve balance and other factors,that will make the plasma deviation from LTE.This has to consider the effect on population distribution and radiation properties by non-local thermodynamic equilibrium?NLTE?plasma condition.Population distribution is obtained by solving the Saha equation in LTE plasma and obtained by solving the rate equation which based on the collision radiation model?CRM?under the steady state approximation in NLTE plasma.The emission spectrum,opacity and intensity is calculated using the detailed level approximation?DLA?model.Chapter2 gives details of these models.In addition,the reliability of the theoretical model is verified by comparing with the experimental results.In the third chapter,in NLTE plasma,we made a detailed analysis of the contribution of photoexcitation?RE?,photoionization?RI?,electron impact excitation?EIE?,electron impact ionization?EII?,self-ionization?AI?and their inverse processes on lines intensity.In the ICF,the electron temperature can reach 1-10KeV and the electron density can reach10²³-10²⁴cm^-3.It is found that,under this condition,the processes of electron impact participation are the main mechanism that affects lines intensity,instead,the effect of the radiation field processes are very weak.In general,the EII processes contribute more than the EIE processes to line intensity.Due to the spatial distribution of electron temperature and density is great signifi-cance to the design of implosion target ball,in Chapter 4,we made a detail simulated of the experimental results[L.Welser-Sherrill,R.C.Mancini et al.,Phys.Re v.E.76,056403?2007?].After the diagnosis,we get the following results:the highest temperature in the center of the target and the temperature is the lower in the outer;the density is the largest in near the center of the target,the center is slightly smaller and the outer layer is smaller.The above is the full content of this article.In this paper,we mainly studied the influ-ence of the additional radiation field,the electron impact processes and the hot electrons on population distribution and radiative properties in NLTE plasma.Further,we made a diagnose on the spatial distribution of electron temperature and density in the implosion target.Problems of the mixing between the neighboring layers in the implosion target,Stark broadening of the emission line and so on remain to be further studied.