The Mathematical Model & Finite Element Heat Analysis Model Of ICF Target By The Thermal Gradient Method

Inertial Confinement Fusion power is the new energy of the future. The ideal type of target for ICF is cryogenic target. In this thesis the method of producing cryogenic target by non-contact thermal gradient is investigated, involving the components of the fuel composition in ICF target under the vapor-liquid equilibrium phase,and the analogy calculation of the far-field thermal temperature gradient which will sustain a uniform liquid(solid) layer inside a spherical ICF target full of the fuel mixture,when under the work temperature,what's more,the relative experiment system is designed.On the basis of the mass conservation in the target, a model used to analyze the components of the fuel composition in the target under the vapor-liquid equilibrium phase is brought, the connection between the thickness of liquid fuel layer and the filling temperature and gas press under the work temperature is given by use of the model.In order to acquire the uniform liquid layer inside the wall of the target,a consistence mathematics model for duplicate or ternary mixture fuel is created. On the assumption that the liquid layer of the fuel in the target is uniform, and the gas bubble suspending in the liquid lies in the central position of the microball, by analysis of the forces applied in the bubble suspended inside the liquid fuel, the value and direction of the near-field temperature gradient is gained, then by a heat-transfer model which takes use of the sotware ANSYS, through analyzing the course the target thermal transport, the far-field temperature gradient used to built up a uniform liquid layer inside target is gained, the result is fit well with the data achieved by experiment. This showes this mathematics model is credible, and can be applied in the manufacture of the cryogenic target.In addition, the cryostat with optical windows was built ,the working temperature ranges from10K to 40 K, the thermal gradient can be adjusted between 0 and 20 K/cm, the precision is 0.2K. The real-time computer recording system for holographic interferometer is established too. All of these provide the base for theory and design of the cryogenic target.