Permanent magnet type quadrupole magnet and assembling method thereof

Abstract

The invention provides a permanent magnet type quadrupole magnet and an assembling method thereof. The permanent magnet type quadrupole magnet comprises a metal skeleton with a containing cavity, a plurality of magnetic blocks and a plurality of jackscrews, wherein the magnetic blocks and the jackscrews are located in the containing cavity and arranged in a Halbach array mode. The top of each magnetic block is fixed to the inner side of the metal skeleton through the plurality of jackscrews and extrudes towards the center of the metal skeleton, so the side faces of every two adjacent magneticblocks are tightly attached, and the bottoms of the magnetic blocks are sequentially connected end to end to form a circular cavity. The invention further discloses an arrangement mode of the magneticblocks in the metal skeleton so as to improve the rate of finished products. When the permanent magnet type quadrupole magnet is assembled, an auxiliary tool is used, the auxiliary tool is taken outafter the magnetic blocks are fixed in place, then magnetic center measurement is carried out, and mechanical treatment is carried out on the outer circle of the quadrupole magnet skeleton according to the measurement result until the eccentricity of the magnetic center meets the design requirement.

Description

technical field [0001] The invention relates to the technical field of quadrupole magnets in particle accelerators, in particular to a permanent magnet quadrupole magnet and an assembly method thereof. Background technique [0002] The quadrupole magnet is the focusing element of the charged particle beam. The permanent magnet quadrupole magnet has the advantages of compact structure, no need for power supply and water supply, and stable magnetic field, which helps the accelerator to achieve higher acceleration efficiency. In addition to the accelerator, it is also suitable for other applications that require miniaturization and high stability of the magnetic field. beam focusing system. [0003] American scholar Halbeck designed a permanent magnet quadrupole magnet structure. In this design, magnetic blocks with different magnetization directions are closely arranged, but there is a large repulsion between the actual magnetic blocks, which makes it difficult to assemble. ...

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Problems solved by technology

[0003] American scholar Halbeck designed a permanent magnet quadrupole magnet structure. In this design, magnetic blocks with different magnetization directions are closely arranged, but there is a strong repulsion between the actual magnetic blocks, which makes it difficult to assemble.

In order to overcome the difficulty of assembly, a structure supported by an inner core metal is usually used, but the inner core metal is prone to slow deformation, and the magnetic field formed by the quadrupole magnet will also change accordingly, and the long-term stability is poor; and the existence of the inner core metal reduces the The available beam aperture is small, which easily reduces the beam transmission efficiency

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