Motion Simulation Of Particle Contamination And Clean Experiment In Final Optics Assembly

Laser confinement nuclear fusion is an important concern to solve the energy problem because of its advantages of clean,rich and high efficiency.In addition to the structural problems of the device,increasing the load capacity and conversion efficiency of the device is also the focus of the current research direction,and the damage of the optical components is the main factor which limits the load capacity of the device.When the high-energy laser passes,the defects of the pollutants and the surface of the optical components in the device can lead to the damage of the optical components and reduce the damage threshold of the optical components,greatly shorten the service life of the optical components and increase the maintenance cost of the devices.In this paper,the optical components in the terminal optical components of Shenguang-III are taken as the research object.The mechanism of the movement of the fine particulate matter in the device are treated as the research basis.Working on the clean gas exchange technology,clean air knife technology and electrostatic technology to maintain the device within a certain degree of cleanliness using the simulation and experimental technique.Therefore,building the theoretical and experimental basis for the terminal optical components of the clean system.Firstly,in this paper,based on the parameters of the particulate pollutants proposed in the literature,the experimental results of the parameters such as the emission velocity are recorded.Based on the experimental data,the motion law of the particulate pollutants produced by the laser damage is simulated.The motion of the particles with different particle sizes and different initial velocities in the simplified model is explored with laminar flow.The flying distance of the pollutants is caused,which will pose a threat to the adjacent optical components.Secondly,a series of laser-based experiments on the motion and distribution of pollutants in the laser are carried out.The optical elements of different states were irradiated with different energy laser,and the pollutant particles produced in different states were statistically analyzed.It was confirmed that there were some initial momentum of particulate pollutants and that the particulate pollutants could cause the adjacent optical elements to be contaminated,so that the simulation parameters in the next step were determined.Using a large flat glass plate to receive the contaminant particles after the target practice.The transverse distribution of contaminant particles was calculated by polarizing microscope and dark field microscopy.The longitudinal distribution of pollutants was calculated by particle counter.Then,the motion law of the particulate pollutants produced by the laser damage is simulated.Through the addition of air knife and electric field,the simulation explores the different conditions of cleaning effect.Finally,the air flow law of the inner flow field of the terminal optical module is simulated to verify the feasibility of the cleaning scheme.Finally,experiments were conducted based on the wind knife and laminar flow.And the internal flow field clean experimental analysis was made based on small frequency multiplier module.The clean effect of the pollutant particles from the optical element with different diameter of different initial diameter is analyzed by the laminar wind with fixed wind speed and fixed pressure air knife.As well as the experimental analysis of dumping the pollutants particles of different diameter under the laminar flow in the small frequency multiplier module was done.