Enhance Diffusion Ability Of Ar In Glass Microspheres By Ion Beam Irradiation And Simulation On Glass Microstructure

Nowadays,inertial confinement fusion（ICF）is a popular controlled fusion.Acting as the containment for fusion fuels,Hollow glass microspheres（HGM）are one of the most crucial parts in the processes of ICF.And,it becomes to an key procedure how to insert the deuterium,tritium as well as diagnostic argon gas into the HGMAs a significant precondition,it is important that we must not destroy the macrostructure of the HGM for experiment,such as roughness of the surface,sphericity.Then structure modified by ion beam is an effective method.After irradiation by ion beam,there will be some damage in the wall of HGM,then there will be some extra path for argon gas to get through,hence,we can enhance the diffusion factor for argon.In order to investigate the enhancement by different kinds of ion beam,different energy,in this work,2.6 MeV Ar ion beam,5.0 MeV Kr ion beam,as well as multiple energy including 5.8 MeV+2.5 MeV+1.0 MeV were addressed to irradiate the HGMs.Then,under variable temperature and argon pressure,let the argon gas diffused into the HGMs.At the same time,classical molecular dynamic simulation method also was used to research the microstructure of HGM glass,by doing this,we can get the void distribution in the glass.After a series of experiments and simulation,the following solutions were gotten:1.Under irradiation by 2.6 MeV Ar¹¹⁺ions with fluence of 1×10¹⁵ ions/cm2,by the method of X-Ray Fluorescence（XRF）,apparent argon signal can been seen when the condition is 400 Celsius degree and 0.7 MPa for 33 h;2.Under irradiation by 5.0 MeV Kr¹⁷⁺ions with fluence of 1×1015 ions/cm2,with the condition of room temperature and 0.48 MPa,quadrupole mass spectrometer（QMS）measured 0.008 bar and 0.015 bar argon pressure.At the same time,when the fluence comes to 2×1015 ions/cm2,with the condition of 400 Celsius degree and 0.41MPa argon pressure for 24 h,there were a 0.009 bar argon pressure signal;3.Compared with single energy irradiation,under multiple energy of K²²⁺irradiation（1.0 MeV+2.5 MeV+5.8 MeV）,the results for argon distribution were much better;4.Taking account on those experiments associating to this work,the more DPA is addressed in the HGMs,the better insert argon gas result is.While,mechanical properties decrease with the increasing of DPA.At the same time,under multiple energy of K²²⁺irradiation,mechanical properties decrease,under the pressure comes to 0.68 MPa,the HGMs are much more fragile;5.From a point of view for application,classical molecular dynamic simulation can be used to get many useful information of sodium borosilicate glass.The results of simulations indicates that when K=40.5,the content of BO4 decreases with the R;and for R=17.4,the content of BO4 appears extremum when K=20.In the practical work for insert argon atoms,when K=40.5,R=17.4,8.5 and 4.2,there are more voids for argon atoms to insert into HGMs.The glass component for the practical work is K=40.5 and R=17.4,so it is favourable to accomplish the project of insert argon atoms into HGMs.