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Precession magnetic field generation device for spin echo small-angle neutron scattering spectrometer

A neutron scattering and generating device technology, which is applied in the direction of material analysis, measuring devices, and instruments using wave/particle radiation, can solve the problems of affecting neutron polarizability, inconvenient installation and placement, and neutron polarizability reduction , to achieve the effect of improving the uniformity of the magnetic field, simple structure and reliable performance

Active Publication Date: 2020-09-25
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in order to ensure that the uniformity of the magnetic field at the center of the existing precession magnetic field generation device of the spin echo small-angle neutron scattering spectrometer meets the requirements of use, it usually requires the length of the pole plate in the direction of the neutron beam to be greater than 300mm, which causes the entire precession magnetic field The volume of the generating device is large, which is not easy to install and place, and the fugitive field is too large, which affects the neutron polarizability; if the length of the polar plate is too small, the uniformity of the magnetic field at the center of the polar plate is poor, and the neutron polarizability Reduced, affecting the overall performance of the spectrometer

Method used

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  • Precession magnetic field generation device for spin echo small-angle neutron scattering spectrometer
  • Precession magnetic field generation device for spin echo small-angle neutron scattering spectrometer
  • Precession magnetic field generation device for spin echo small-angle neutron scattering spectrometer

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Embodiment 1

[0037]In this embodiment, the iron core 5 , the pole plate 6 and the pole plate step 7 are integrally processed and formed by a whole piece of high magnetic permeability DT4 stainless steel. The contact surface between the iron core 5 and the end plate 12 is polished smooth by a high-precision grinder, and then attached to each other, and then fixed with bolts. An insulating layer is added to the coil 8 and the iron core 5 to fully insulate the two, and the insulating joints are filled with 704 silica gel for supplementary insulation. An insulating layer is added between the coil 8 and the pole plate 6, which is made by stacking 5 layers of synthetic mica sheets. The space between the coil 8 and the cooling water jacket 10 is filled with BT116P potting compound. The opening of the cooling water pipe 11 on the end face of the cooling water jacket 10 is covered with a water jacket cover plate 12, and the water jacket cover plate 12 is connected to the cooling water jacket 10 by...

Embodiment 2

[0040] The structure of this embodiment is the same as that of Embodiment 1, the difference is that the outer dimensions of the yoke plate are 240mm (length) × 580mm (width) × 50mm (height); the iron core is cylindrical, and the outer dimensions are 115mm (radius) × 220mm (high). After the above-mentioned implementation, the present invention can generate a magnetic field > 2550Gs within the range of 120mm (length) × 20mm (width) × 60mm (height) in the central area between the two pole plates of the high-uniformity magnetic field generating device, and the uniformity of the magnetic field is better than 0.9Gs, integral uniformity is 2.91×10 -6 T·m, polarized neutrons precess 56,758 circles in the uniform magnetic field area generated by the device, and the maximum precession angle difference is 30.8°.

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Abstract

The invention provides a precession magnetic field generating device for a spin echo small-angle neutron scattering spectrometer. The device comprises an electromagnet coil, an electromagnet magneticpole, an electromagnet magnet yoke and a coil outlet box. According to the device, a large direct-current electromagnet and a polar plate step structure are adopted, and a high-uniformity square magnetic field is generated; the edge of the pole plate is provided with a step integrally processed with the pole plate, so that the uniformity of a magnetic field in the center of the whole device is improved while the overall size of the pole plate is reduced. The device matches a spin echo small-angle neutron scattering spectrometer for use, is used for providing a magnetic field required by precession of polarized neutrons, can be used for measuring nano-to-micron scale dislocations, holes, precipitated phase microstructures and other microstructures in a material, and can also be used for measuring a strong neutron absorption material thereby making up the defects of a neutron scattering technology in the aspect.

Description

technical field [0001] The invention belongs to the technical field of small-angle neutron scattering, and in particular relates to a precession magnetic field generating device for a spin-echo small-angle neutron scattering spectrometer. Background technique [0002] It is used to provide the spin-echo small-angle neutron scattering device with a high uniformity precession magnetic field required for polarized neutron precession, and can be used to measure materials such as polymer materials, colloids, complex fluids, alloys, nanocomposites, and organic films The internal microstructure information such as voids, dislocations, cracks, crystallization, etc. at the scale of nanometer to micrometer plays a guiding role in the research of material selection, processing technology, damage and aging, etc. The spin echo small angle neutron scattering spectrometer uses two sets of precessing magnetic fields to convert the scattering angle information into the precession information...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/202G01N23/20008
CPCG01N23/202G01N23/20008
Inventor 屠小青王燕孙光爱黄朝强庞蓓蓓吴瞻宇王云王宗悦曹晓峰潘建
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF