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Composite magnet with edge field amendment

A composite, edge-banded technology, applied in the field of electromagnetic field, can solve the problems of increased beam envelope, mutual interference of edge magnetic fields, poor magnetic field distribution, etc., and achieve the effect of improving the distribution

Inactive Publication Date: 2011-02-09
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One is to increase the proportion of the fringe field in the entire integrated magnetic field, so that the actual beam optics is very different from the beam optics calculated when the original hard-edge approximation is used, resulting in linear beam optics adjustment in the actual field Difficulty and beam envelope increased
[0005] Second, because the tail of the fringe magnetic field is long, it is easy to cause the fringe magnetic fields of adjacent magnets to interfere with each other, thereby affecting the field distribution in the magnet.
This method has a certain effect, but the magnetic field distribution after adding shielding magnets is not good, and the shielding iron is easily saturated, which has a great influence on the field distribution at different field levels

Method used

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  • Composite magnet with edge field amendment
  • Composite magnet with edge field amendment
  • Composite magnet with edge field amendment

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0026] like figure 1 as shown, figure 1 It is a structural schematic diagram of a composite magnet (two-pole magnet) with fringe field correction provided by the present invention. The composite magnet is composed of a main magnet and an additional magnet located at at least one end of the main magnet. One end of the main magnet corresponds to an additional magnet. magnet.

[0027] The main magnet includes: a main magnet yoke; an even number of symmetrically placed main magnet poles located inside the main magnet yoke and integrated with the main magnet yoke; winding on each main magnet pole The main magnet coil substantially covers the side surface of the main magnet pole head. The main magnet is generally a dipole ma...

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Abstract

The invention discloses a compound magnet with fringe field modification. The compound magnet is formed by a main magnet and an additional magnet which is arranged at at least one end of the main magnet. One end of the main magnet is corresponding to the additional magnet. The defect of the prior art is overcome by using the compound magnet, thus effectively improving the distribution of the fringe magnetic field of large aperture magnet ends.

Description

technical field [0001] The invention relates to the field of electromagnetic field technology, in particular to a composite magnet with fringe field correction, which is used in a charged particle beam device. Background technique [0002] Many circular particle accelerators and beam delivery lines need to use magnets with larger apertures (such as magnetic gaps or inscribed radius greater than 100mm), including dipole magnets, quadrupole magnets and high-order magnets. The shape of the longitudinal magnetic field distribution generated by the magnet is directly related to its aperture. The larger the aperture, the greater the extension distance of its fringe magnetic field. The ideal longitudinal magnetic field distribution is square waveform (hard edge approximation). [0003] The fringe field of large aperture magnets has three distinct disadvantages: [0004] One is to increase the proportion of the fringe field in the entire integrated magnetic field, so that the actua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J37/00H01F7/00
Inventor 唐靖宇
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI