A six-pole magnet for homogenizing permanent magnetic beam current

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...

AI Technical Summary

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

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