Laser inertial confinement fusion hot spot high spatial resolution detection system and method

Abstract

The invention discloses a laser inertial confinement fusion hot spot high spatial resolution detection system and method. The system comprises a flat response spherical objective lens I and a flat response spherical objective lens II which are vertically arranged and have reflecting surfaces opposite to each other, a composite flat response spherical objective lens III which is horizontally arranged and has a vertically upward reflecting surface, a flat response energy selection plane mirror I and a flat response energy selection plane mirror II which are horizontally arranged and have a vertically upward reflecting surface, an imaging plate and a laser phosphorus screen analyzer. The calculation method is mainly used for reading data and directly obtaining the electron temperature and density through the intensity ratio of the single-energy image according to the bremsstrahlung principle. Influence of view field difference is eliminated mainly through a double-KB-mirror channel system, and the reflectivity is ensured to be consistent by utilizing the flat response of the channel and the plane mirror, the absolute values of the electron temperature and density are calculated according to the bremsstrahlung radiation principle, the calculation process is simpler, the result is more reliable, the absolute hot spot electron density value can be solved, and the system and the method have wide and important application prospects.

Description

technical field [0001] The invention relates to the technical field of electronic parameter detection, in particular to a laser inertial confinement fusion hot spot detection system and method with high spatial resolution. Background technique [0002] The realization of laser inertial confinement fusion (ICF, Inertial Confinement Fusion) controlled nuclear fusion target requires the deuterium-tritium fuel in hot spot state to reach extremely high electron temperature and electron density in the later stage of implosion compression of the target capsule. The high spatial resolution detection of hot spot electron temperature and density is the basis for in-depth study of a series of physical problems in the hot spot state, such as implosion efficiency, RT (Rayleigh–Taylor) instability, hot spot mixing, etc. It is an important and difficult point in the study of laser fusion. [0003] At present, due to the weak self-emission of hot spots, hot spot doping is usually used in t...

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Problems solved by technology

[0004] The above detection methods often have the following deficiencies. First, the spatial resolution of multi-pinhole imaging is limited by the size of the pinhole. The pinhole is usually 10-25 μm, but the size of the hot spot is 30-60 μm. Collecting 3 to 6 data points, obviously the spatial resolution is insufficient; second, when doping elements, they are usually medium and high Z elements, these elements will bring radiation cooling effect, will reduce the temperature of the hot spot, and affect the measurement results ;Third, using the iterative calculation method, the accuracy of the obtained temperature and density results is relatively low

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