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...

Examples

Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] The present invention is an improvement on the basis of the quadrupole magnet adopted by the accelerator. The original quadrupole magnet includes four magnetic poles 1 arranged oppositely in pairs, and each magnetic pole is provided with an excitation wire package 3 and is fed with an excitation current. like figure 1 as shown, figure 1 The drawing in is a quarter of the whole magnet, and the whole picture is symmetrical about the X coordinate axis and the Y coordinate axis. In the present invention, a pair of shielding magnetic poles 2 are added in the middle of the four magnetic poles, and the pole head is a plane, so that the magnetic field generated by it is a zero field area 4 . The pole head surface of the original quadrupole magnet pole 1 is a hyperboloid, such as the curved surface formed by the stretching of the (x-a)*y=b curve along...

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...

Examples

Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] The present invention is an improvement on the basis of the quadrupole magnet adopted by the accelerator. The original quadrupole magnet includes four magnetic poles 1 arranged oppositely in pairs, and each magnetic pole is provided with an excitation wire package 3 and is fed with an excitation current. like figure 1 as shown, figure 1 The drawing in is a quarter of the whole magnet, and the whole picture is symmetrical about the X coordinate axis and the Y coordinate axis. In the present invention, a pair of shielding magnetic poles 2 are added in the middle of the four magnetic poles, and the pole head is a plane, so that the magnetic field generated by it is a zero field area 4 . The pole head surface of the original quadrupole magnet pole 1 is a hyperboloid, such as the curved surface formed by the stretching of the (x-a)*y=b curve along...

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