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An adjustable piston-type magnet structure in the central area of ​​an isochronous cyclotron

A cyclotron and central area technology, applied in the direction of magnetic resonance accelerators, accelerators, electrical components, etc., can solve problems such as difficult to achieve the working state of the bump field, magnet processing and installation errors, etc., to increase the flexibility of debugging, reduce The effect of affecting and reducing the loss rate

Active Publication Date: 2018-06-29
HEFEI CAS ION MEDICAL & TECHNICAL DEVICES CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of actual use, due to the error of magnet processing and installation, the actual magnetic field inevitably deviates, and it is difficult to achieve the ideal working state of the bump field.

Method used

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  • An adjustable piston-type magnet structure in the central area of ​​an isochronous cyclotron
  • An adjustable piston-type magnet structure in the central area of ​​an isochronous cyclotron
  • An adjustable piston-type magnet structure in the central area of ​​an isochronous cyclotron

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example

[0030] Taking a superconducting isochronous cyclotron with an extracted proton energy of 200 MeV as an example to further illustrate the specific implementation.

[0031] First, set a cylindrical piston-shaped magnet body in the central area, open different holes in the center of the cylindrical magnet, use finite element software to calculate the size and position of different openings, and the outer diameter, thickness, and distance from the mid-plane of the cylindrical magnet itself The influence of parameters such as distance on the magnetic field; after a series of optimizations, it is ensured that a bump field of about 200Gs can be generated.

[0032] After determining the main parameters of the piston-type magnet body, fine-tune the thickness of the piston-type magnet body and the distance from the mid-plane, and find the appropriate thickness and distance from the mid-plane through beam dynamics calculations, so that the particles do not slip phase and can meet better r...

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Abstract

The invention provides an isochronous cyclotron center-area adjustable piston type magnet structure. The structure comprises a piston type magnet body, a flange which is arranged on a yoke cover plate, and a threaded rod which is connected with the flange and the piston type magnet body. The piston type magnet body is in a cylindrical structure with two symmetrical holes in the center. The threaded rod and the flange are connected through a nut. According to the invention, a suitable bump field is provided for the center-area, which enhances the axial focusing of particles and reduces the beam loss rate; the piston type magnet can be finely adjusted according to the actual beam effect during debugging operation; the flexibility of debugging operation is reduced; and the impact of magnet machining and installation errors on a magnetic field is reduced.

Description

technical field [0001] The invention belongs to the field of cyclotrons, in particular to an adjustable piston-type magnet structure in the central area of ​​a superconducting isochronous cyclotron. Background technique [0002] In an isochronous cyclotron, the axial focusing of particles is provided by the degree of modulation of the magnetic field and the helix angle. In the central region, the modulation degree and helix angle are too weak to provide sufficient axial focusing, and focus compensation provided by electric field and convex magnetic field (bump magnetic field) is required. The bump magnetic field can be constructed by some special magnet structures. However, in the process of actual use, due to the error in the processing and installation of the magnet, the actual magnetic field inevitably deviates, and it is difficult to achieve the ideal working state of the bump field. Contents of the invention [0003] The purpose of the present invention is to provid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05H13/00H05H7/04
CPCH05H7/04H05H13/005H05H2007/043
Inventor 宋云涛周凯葛剑丁开忠周健
Owner HEFEI CAS ION MEDICAL & TECHNICAL DEVICES CO LTD