Research On Adhesive Mechanism Of Contamination On Final Optic Assembly And Cleaning Technology

As the last link of the shenguang-Ⅲ facility,Final Optical Assembly is one of thecore unit of the laser device of the Inertial Confinement Fusion，but in the process of theexperiment of practical examination aimed to the device,we found serious pollutionexisted on the terminal optical component. The contaminant,derived from the ingredientin cutting fluid which residues in the workpiece surface in the process of machining,seriously affected the beam quality and intensity,urther restricting the continuity﹑stability and safety of laser target shooting.In addition,the existence of the pollutantscould lead to high local heat,which improve the damaged probability of optical element.So it is necessary to give some researches on the adhesion of contamination on thesurface of the optical components and understand its mechanism.At first,the basic theory of molecular dynamics is introduced to laid a foundationfor the selection of the potential function﹑integration step、ensemble and temperaturecontrol strategy used in these simulations, at the same time,the current cleaning processof the terminal optical components are introduced.Then, experimental researches were adopted to investigate the influence of processparameters and external conditions on the surface cleanliness of optical components,mainly focusing on the indoor clean environment level, drying technology and types ofmaterials which could affect the contact angle size of water and the ability to form awater film of the surface.Thirdly，we performed molecular dynamics (MD) simulations to investigateequilibrium behavior of water droplets on flat (aluminum) and fluted surfaces.Theregular distribution of water molecules was analyzed when water adsorb on the perfectsurface.Aslo,we examine variations in the contact angle with the width and height of thegrooves to estimate the impact of nanostuctures on the wettability of water.Finally，by simulation of the adsorption of C12molecules on hydroxylated aluminasurface using molecular dynamics simulation,we constructed a contaminated surfaces.Then on this basis, the mechanism of oil detachment from solid surfaces in CTABaqueous surfactant solutions is studied by molecular dynamics simulations and wesummarized the role of surfactant in cleaning agent.