Permanent magnet beam halo processing nonlinear magnet

Abstract

The invention belongs to the technology of accelerator design, and particularly relates to a beam halo processing nonlinear magnet for an accelerator. The beam halo processing nonlinear magnet structurally comprises four magnetic poles which are oppositely arranged in pairs, and a magnetic field excitation component is arranged outside each magnetic pole, wherein a pair of shielding magnetic poles are arranged at the middle position of the four magnetic poles, the pole heads of the shielding magnetic poles are planes, a magnetic field generated by the plane pole heads is a null field, and a magnetic field generated by the pole heads of the four magnetic poles is a linear focusing area or a nonlinear focusing area; each magnetic field excitation component comprises a permanent magnet serving as excitation of a main magnetic field and excitation coils as excitation of auxiliary magnetic fields. The magnet provided by the invention can generate large-scale null field and focusing field strength, and the current beam halo processing problem can be solved, so that low-density particles on the edge are used for focusing high-density particles overlapped to the center, and negative influences of beam halo particles are avoided.

Description

technical field [0001] The invention belongs to the accelerator design technology, in particular to a non-linear magnet treated with a permanent magnetic beam halo for an accelerator. Background technique [0002] The particle distribution of the transverse section (beam spot) of the beam generated by the accelerator is generally Gaussian distribution, that is, the distribution of particles bombarded on the target is not uniform. Gaussian distribution of the beam spot will have a small area of ​​high-density beam nucleus and a large area of ​​low-density beam halo around the beam nucleus. For particles with medium and low energies, beam halo particles can be directly blocked by a collimator, but after acceleration and transmission, new beam halo particles will be generated. For high-energy particles, after the beam halo particles bombard the collimator and beam pipe, a large radiation dose will be generated, resulting in the activation of matter. Therefore, accelerator bea...

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Problems solved by technology

[0003] At present, the treatment of beam halo at home and abroad is the method of collimator, and the problem of activation is difficult to solve fundamentally.

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