Electrostatic wave diagnostic method and diagnostic device for laser plasma instability

A laser plasma and instability technology, applied in thermal excitation analysis, material excitation analysis, etc., can solve the problems of inability to obtain the absolute intensity information of electrostatic waves, difficulty in diagnosis platform, instability, etc., and achieve easy diagnosis and diagnosis Better, more reliable results

Active Publication Date: 2022-04-19
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a method and device for diagnosing laser plasma instability electrostatic waves, which solve the problems in the prior art that it is difficult to build a diagnostic platform, the absolute intensity information of electrostatic waves cannot be obtained, and the It can simultaneously diagnose two or more laser plasma instability static waves and other problems that occur at the same position at the same time

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  • Electrostatic wave diagnostic method and diagnostic device for laser plasma instability
  • Electrostatic wave diagnostic method and diagnostic device for laser plasma instability

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Such as figure 1 , figure 2 Shown, a kind of laser plasma instability electrostatic wave diagnosis method comprises the following steps:

[0062] S1, producing an electron beam probe with an energy of more than 100 MeV and a beam length of 0.1 μm to 100 μm;

[0063] S2, obtaining the original density information of the electron beam probe;

[0064] S3, excite the unstable electrostatic wave of the laser plasma, inject the electron beam probe with known original density information into the electrostatic wave, and make the electron beam probe generate density modulation under the action of the electrostatic wave electric field when passing through the plasma;

[0065] S4, combining the original density information of the electron beam probe obtained in step S2, to obtain the density modulation spatial distribution information of the electron beam probe after passing through the electrostatic wave;

[0066] S5, inverting and reconstructing the spatial distribution inf...

Embodiment 2

[0104] Such as figure 1 , figure 2 As shown, a laser plasma instability electrostatic wave diagnosis device includes an electron beam probe generation device 1, a magnetic field generation device 2, a plasma to be diagnosed 3, and a transit radiation medium arranged along the electron beam probe propagation direction in sequence. 4. It also includes transit radiation imaging devices 5 arranged on both sides of the transit radiation medium 4 .

[0105] The function of the electron beam probe generating device 1 is to generate the electron beam probe; the function of the magnetic field generating device 2 is to focus the electron beam probe and improve the quality of the electron beam; the function of the plasma to be diagnosed 3 is to generate plasma, which is divided here There are two types, one is excited by electrostatic waves, and the other is excited without electrostatic waves. When obtaining the original density information of the electron beam, the electron beam pass...

Embodiment 3

[0115] Such as figure 1 , figure 2 As shown, on the basis of Embodiment 1 and Embodiment 2, this embodiment provides a more detailed technical solution.

[0116] Taking the stimulated Raman scattering scattering excited by a laser with a wavelength of 1 μm in a plasma of 0.1 times the critical density as an example, the wavelength, phase velocity and frequency of the electrostatic wave generated by it can be pre-evaluated. The beam length of the electron beam probe required for the electrostatic wave in the example is less than 10 μm, the energy of the electron beam probe can be selected as 200 MeV, and the transition radiation medium used to generate the transition radiation is selected as a 100 μm thick copper plate, and the transition Radiation diagnostic equipment has a temporal resolution of less than 6 femtoseconds (approximately 2 times the laser period) and a spatial resolution of less than 1 μm.

[0117] In specific implementation, the following steps can be adopte...

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Abstract

The invention discloses a diagnostic method and a diagnostic device for electrostatic waves of laser plasma instability. The diagnostic method includes the following steps: S1, generating an electron beam probe with an energy of more than 100 MeV and a beam length of 0.1 μm to 100 μm ; S2, obtain the original density information of the electron beam probe; S3, excite the unstable electrostatic wave of the laser plasma, inject the electron beam probe with known original density information into the electrostatic wave, and make the electron beam probe pass through the plasma Density modulation is generated under the action of the electrostatic wave electric field; S4, obtain the spatial distribution information of the density modulation of the electron beam probe after passing through the electrostatic wave; S5, invert and reconstruct the spatial distribution information of the density modulation, and obtain the absolute intensity information of the electrostatic wave . The invention solves the problems in the prior art that it is difficult to build a diagnosis platform, the absolute intensity information of electrostatic waves cannot be obtained, and the simultaneous diagnosis of two or more laser plasma unstable electrostatic waves occurring at the same position cannot be performed at the same time.

Description

technical field [0001] The invention relates to the technical field of laser plasma instability electrostatic wave diagnosis in laser inertial confinement fusion, in particular to a laser plasma instability electrostatic wave diagnosis method and a diagnosis device. Background technique [0002] Laser plasma instability is one of the key factors restricting the successful ignition of laser inertial confinement fusion, and it is a physical process that people try to suppress in laser fusion. By carefully studying the physical mechanism of laser plasma instability, we can theoretically obtain effective methods to suppress it, while the experimental research on the physical mechanism of laser plasma instability is mainly carried out by diagnosing its two major products—scattered light and electrostatic waves. . The scattered light signal obtained in the current experiment is the result of path integration, and the location of the instability and the growth law on the path cann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/73G01N21/71
CPCG01N21/73G01N21/71
Inventor 潘凯强李志超龚韬郭亮李琦赵航李三伟蒋小华杨家敏
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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