Homogenized sextupole magnet of permanent magnet beam

A homogenization, pole magnet technology, applied in the direction of electromagnets, accelerators, electrical components, etc., can solve the problems of poor uniformity and uneven beam current, and achieve the effect of good homogenization effect.

Active Publication Date: 2015-06-10
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
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Problems solved by technology

The goal of the homogenization of the non-linear step field dipole magnet is to translate the particles at the edge of the beam to the inner area with equal density, but the beam it translates is not uniform. When the translation is superimposed, it is high density and relatively high density. Overlay, the overlay of low density and lower density, the uniformity of the overlay is still not very good

Method used

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  • Homogenized sextupole magnet of permanent magnet beam
  • Homogenized sextupole magnet of permanent magnet beam
  • Homogenized sextupole magnet of permanent magnet beam

Examples

Experimental program
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Embodiment

[0025] The pole distance of the six-pole magnet provided by the present embodiment is as follows: figure 1 As shown, the distance between poles 3 and 6 is the same as the distance between poles 4 and 5, which is 5cm, the distance between poles 1 and 2 is 1.1cm, and no magnetic field excitation components are set on poles 1 and 2. Magnetic field excitation components are arranged on the remaining magnetic poles 3, 4, 5, and 6. The direction of the magnetic field generated in the opposite magnetic poles 3,6 of the two magnetic field excitation assemblies 7,10 is opposite to the direction of the magnetic field generated in the opposite magnetic poles 4,5 of the other two magnetic field excitation assemblies 8,9, and the opposite magnetic poles 3,6 (or 4, 5) the direction of the magnetic field generated in the same, so as to form a symmetrical magnetic field distribution with respect to the center line of the magnet. The magnetic field excitation assembly includes permanent magne...

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Abstract

The invention belongs to the design technology of an accelerator, and particularly relates to a homogenized sextupole magnet of a permanent magnet beam. According to the sextupole magnet, the field exciters of a pair of relative magnetic poles are cancelled based on a traditional design, the distance between the pair of magnetic poles is shortened, and field excitation directions in a pair of adjacent magnetic poles is changed at the same time. A field excitation component comprises a permanent magnet as a main field exciter and an excitation wire wrap as an auxiliary field exciter. According to the homogenized sextupole magnet provided by the invention, the symmetric about the origin of a coordinate of a magnetic field generated on an X axis can be realized, and the square of the size is proportional to the square of the position of the magnetic field, therefore a good homogenization effect can be provided to beam spots which are in a trigonometrical density distribution way.

Description

technical field [0001] The invention belongs to the design technology of an accelerator, and in particular relates to a hexapole magnet for homogenizing the permanent magnetic beam current of the accelerator. Background technique [0002] The particle distribution of the transverse section of the beam generated by the accelerator is generally Gaussian distribution, that is, the distribution of particles bombarded on the target is not uniform. In some industrial electron irradiation occasions, the requirements for beam irradiation uniformity are very high, such as the irradiation of semiconductor materials. In addition, when the high power density beam generated by the heavy ion accelerator bombards the target, in order to reduce the size of the target and realize the cooling of the target, it is necessary to shape the beam as uniformly as possible while expanding the beam spot. Therefore, the homogenization of the accelerator beam is a very important issue. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05H7/04H01F7/06
Inventor 李金海任秀艳王思力
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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