Neutron spin turnover device based on soft magnetic film and application thereof

Abstract

The invention provides a neutron spin turnover device based on a soft magnetic film and application thereof. The device comprises the soft magnetic film, a film support for mounting the soft magneticfilm, a position adjusting mechanism connected with the film support, and a fixing support for fixing and supporting the position adjusting mechanism. According to the device, the soft magnetic film is used as an in-plane local strong magnetic field, the magnetic field is obliquely arranged at a small angle, so that the internal magnetic field is almost perpendicular to a neutron polarization direction, polarized neutrons generate Larmor precession in the film, and the neutron polarization direction is rotated at approximately 180 degrees under a proper film thickness, so that the effect thatthe film is nearly overturned is achieved. In order to meet the requirements on magnetism and thickness of the film, the soft magnetic film with high saturation flux density is prepared by adopting amagnetron sputtering method, and a high-precision position adjusting mechanism is arranged for the spin turnover film to meet the mounting requirements of high mounting precision and adjustable inclination angle.

Description

Technical field[0001]The invention belongs to the field of nuclear technology application, and specifically relates to a soft magnetic film-based neutron spin flip device and its application.Background technique[0002]The neutron spin echo small-angle scattering technology is an advanced neutron scattering test method that can study the internal molecular structure of high-strength and high-toughness fibers, solar cells, and high-specific surface materials from the atomic structure level, and explore the precipitation phase of special aerospace metal materials Structural evolution, etc. The spin flip device is the core component of the small-angle mode of the neutron spin echo spectrometer. By placing four sets of spin flippers in parallel in the main magnetic field of the spectrometer, the angle at which neutrons scatter from the sample is encoded as the change in neutron beam polarizability, so as to reverse the neutron scattering angle information. At present, the domestic neutron...

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Problems solved by technology

There are very few related studies abroad. One of the spin echo small angle spectrometers based on reactor neutron sources uses a fixed bracket, which can only target neutrons with a fixed wavelength, and the inclination angle of the soft magnetic film installed behind the spectrometer not conveniently adjustable

Especially for the spin echo small angle scattering spectrometer on the reactor neutron source, in order to achieve a higher spin echo length, the parallelism of the neutron flipper needs to be accurate to 1mrad, which is difficult to achieve by manual adjustment alone, and It is difficult to guarantee the consistency of the inclination angles of the four films

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