| The cryogenic target is used to contain fusion fuel in the Laser inertial confinement fusion technology. Some of fuel is condensed into liquid attached on the inner wall of the target. The configuration of the liquid must be uniform in order to compress the fuel symmetrically in the target when the target is irradiated by Laser. The liquid is thinner in the top of the target than the bottom because of the gravity effect. The non-contact thermal gradient method can solve this problem and is studied in this paper. The analysis for the connection of the parameters that can affect the process of filling the target and the establishment of a consistent mathematical model for evaluation of the magnitude of the thermal gradient needed to form uniform liquid layer inside target, and the building up of the relative experimental system are involved in this paper. In the paper, the relationship between the characteristic of target material and the magnitude of differences between the inner press and out press of the target is studied. The temperature effect for leak rate of the material is also discussed. The connection between the thickness of liquid fuel layer and the filling temperature and gas press is given by usage of BWR equation. In order to find out the relationship between the working temperature of the target and the magnitude of the thermal gradient desired, a mathematical model is build up by analysis of the forces applied in the bubble suspended inside the liquid fuel. The magnitude of the thermal gradient desired and the facts that affect the balance of bubble is studied through this model. These facts include thermal gradient and isotopic segregation effect. The result show the effect of isotopic segregation is the key fact in the configuration of the liquid layer. The paper gives the experimental equipment system and measurement system that required. Through the theoretic analysis, the criteria for equipment choosing and designing are gotten.
|
PDF Full Text Request