Neutron polarization equipment

A technology of neutrons and neutron beams, applied in the field of neutron polarization devices, can solve problems such as difficult polarization, and achieve high stability and high transmittance

Inactive Publication Date: 2009-03-04
RIKEN
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  • Abstract
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Problems solved by technology

[0006] By using a magnetic mirror-type polarizer for cold neutrons, it may be possible to obtain a polarization P of approximately 0.99, but it is difficult to obtain a high polarization P equal to or greater than this

Method used

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Embodiment

[0086] FIG. 5 is a schematic cross-sectional view showing the configuration of an experimental device using the neutron polarizer according to the embodiment of the present invention.

[0087] In FIG. 5 , 11 is a neutron polarizer, which includes a Halbach-type quadrupole magnet 12 (hereinafter also simply referred to as a quadrupole magnet 12 ). The length of the Halbach-type quadrupole magnet 12 in the axial direction is about 600 mm, and a cylindrical neutron-absorbing material (hereinafter, also referred to as a Cd tube) 13 composed of Cd is arranged inside it to form a hollow space for the passage of neutrons. part by diameter The form that becomes 5mm extends in the axial direction. The neutron absorbing material 13 is a material for preventing reflection of neutrons on the inner surface of the quadrupole magnet 12, and is formed by spirally winding a Cd plate with a thickness of 0.5 mm. On the downstream side end of the quadrupole magnet 12, a magnetic field connecti...

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Abstract

Neutron polarization equipment for obtaining a neutron beam polarized by the interaction between the spin of a neutron in an incident neutron beam and a magnetic field, characterized by comprising a quadrupole magnet (2) arranged around the passage of a neutron beam, a tubular neutron absorber (3) provided in the quadrupole magnet (2) along the axial direction of neutron, and a solenoid coil (4) arranged at the outlet of the quadrupole magnet (2) in order to connect a magnetic field so as to be heat-insulated from the quadrupole magnetic field by the quadrupole magnet (2) and to apply a dipole magnetic field.

Description

technical field [0001] The present invention relates to a neutron polarization device capable of neutron polarization at an extremely high degree of polarization. Background technique [0002] Polarized neutrons are very useful detection means in the study of neutron scattering, and are indispensable in elucidation of magnetic structure, study of dynamics such as relaxation phenomena by the neutron spin echo method, and removal of non-interferential scattering of. In addition, polarized neutrons play a very important role even in fundamental physics research using neutrons. Although there have been methods using magnet crystals and magnetic multilayer films as methods for obtaining polarized neutrons in the past, and recently, there have been methods using polarized neutrons. 3 However, the development of a neutron polarization device with new characteristics and excellent performance is of great significance in the development of neutron scattering research technology. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21K1/00H05H3/06G21K1/093
CPCG21K1/16H05H3/06G21K1/093
Inventor 清水裕彦铃木淳市奥隆之
Owner RIKEN
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