Evacuating flow washing device and method for ICF helium cavity

Abstract

The ICF helium cavity evacuation flow washing device comprises a helium cavity, the helium cavity is connected with one end of a helium cavity inflation pipe, the other end of the helium cavity inflation pipe is connected with an inlet of a helium cavity air exhauster control valve and an outlet of a helium source control valve, and the inlet of the helium cavity air exhauster control valve is connected with the outlet of the helium source control valve. An outlet of the helium cavity air exhauster control valve is connected with an inlet of the helium cavity air exhauster, and an inlet of the helium source control valve is connected with a helium source outlet; the method comprises an air exhaust stage and an air inflation stage, the one-time air exhaust stage and the one-time air inflation stage are used as evacuation and flow washing processes, the evacuation and flow washing processes are carried out three times, at the moment, the content of impurity gas in a helium cavity is lower than 8250 ppm, and the needed time is the shortest; according to the invention, the concentration of impurity gas in the helium cavity can be conveniently controlled within an allowable range in a more time-saving manner, so that the ignition success rate is improved.

Description

technical field [0001] The invention relates to the technical field of inertial confinement nuclear fusion (ICF) helium cavity freezing, in particular to a device and method for evacuating and washing an ICF helium cavity. Background technique [0002] Inertial confinement fusion (ICF) is a nuclear fusion technology that uses laser shock waves to initiate nuclear fusion reactions, and is one of the main methods to achieve fusion ignition. In the experiment, the helium chamber needs to be filled with high-purity helium to meet the temperature control and backlight characterization requirements of the frozen target. [0003] Under normal circumstances, the concentration of impurity gas in the helium chamber is required to be lower than 8250ppm, so as to ensure that the frost layer formed by the impurity gas during the cooling process will not affect the backlight characterization. In order to achieve such strict concentration requirements and improve the ignition success rate...

AI Technical Summary

Problems solved by technology

The traditional evacuation and flow washing method ("Inflation rate effect in the preparation of ICF planar frozen targets [J]") is to continuously evacuate the helium chamber to an extremely low pressure and then fill it with helium. This method is very time-consuming and It is impossible to effectively judge whether the impurity gas content in the cavity meets the experimental requirements

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