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Helium-3 neutron polarization device

A neutron and component technology, applied in the field of helium three neutron polarization devices, can solve the problems of in-situ system inconvenient transportation, polarization attenuation, etc.

Pending Publication Date: 2020-10-20
CHINA SPALLATION NEUTRON SOURCE SCI CENT +1
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  • Description
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Problems solved by technology

The in-situ system is not easy to transport, and its polarizability decays rapidly with time, so it is necessary to design a corresponding on-line polarized helium three-neutron spin filter system, and maintain a stable polarization of the neutron beam throughout the process , to complete the polarized neutron experiment

Method used

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  • Helium-3 neutron polarization device
  • Helium-3 neutron polarization device
  • Helium-3 neutron polarization device

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Embodiment 1

[0049] Please refer to figure 1 , The present embodiment provides a helium trineutron polarization device, which mainly includes: a polarization assembly, a heating assembly 1, a magnetic field assembly and a laser assembly.

[0050] Among them, such as image 3 , the polarization assembly 1 is a sealed glass container, the container is a sealed polarization chamber, the polarization chamber is used to contain helium trigas and alkali metal gas, the glass container is provided with an injection port, and the injection port is used to inject helium trigas and Alkali metal gas, while the glass container is also provided with FID coil 12, FID coil 12 is used to measure the relative polarizability in the glass container; the system also includes installation cylinder 14, EPR coil 13, photodiode and D2 filter plate 15, Wherein the EPR coil 13 is arranged outside the glass container to apply a radio frequency field, the photodiode 16 is used to detect the fluorescence signal, and t...

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Abstract

The invention relates to the technical field of neutron polarization, in particular to a helium-3 neutron polarization device, which comprises a polarization assembly, a heating assembly, a magnetic field assembly and a laser assembly. A sealed polarization cavity is formed in the polarization assembly and is used for storing He-3 gas; the heating assembly is used for heating the polarization assembly and provides a required high-temperature environment for polarization of He-3 gas; the magnetic field assembly is arranged at the periphery of the polarization assembly and is used for providinga stable polarized magnetic field for a polarization process; the laser assembly is used for introducing circularly polarized light into the polarization cavity so as to provide photons for polarization of the helium-3 atoms, the transition process that the alkali metal atoms absorb the photons is continuously carried out, the alkali metal atoms continuously collide with the helium-3 atoms to complete polarization transfer, finally polarization of the helium-3 atoms is realized, and polarization of neutrons is further carried out.

Description

technical field [0001] The invention relates to the technical field of neutron polarization, in particular to a helium trineutron polarization device. Background technique [0002] Neutrons are spin 1 / 2 particles with a magnetic dipole moment, so they can be polarized to produce a beam of polarized neutrons. Polarized neutron scattering has an unrivaled advantage in the study of magnetic materials, and it is the only detection technology that can distinguish magnetic scattering and nuclear scattering without distinction. In the current mainstream neutron polarization technology, the polarized helium three-neutron spin filter has significant advantages such as large acceptance angle, high polarizability, low background, wide energy spectrum, uniform polarization and analysis capabilities, etc. Currently the mainstream choice for achieving neutron polarization. In the SEOP method in the helium three neutron polarization method, the polarization of helium three is directly re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21K1/16
CPCG21K1/16
Inventor 童欣王天昊张俊佩叶凡黄楚怡
Owner CHINA SPALLATION NEUTRON SOURCE SCI CENT
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