Cyclotron isochronism magnetic field shimming method and system

A cyclotron, isochronous technology, used in magnetic resonance accelerators, accelerators, electrical components, etc.

Active Publication Date: 2017-06-06
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This solves the technical problem in the prior art that the isochronous magnetic field shimming method for compact cyclotrons has defects in accuracy

Method used

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  • Cyclotron isochronism magnetic field shimming method and system
  • Cyclotron isochronism magnetic field shimming method and system
  • Cyclotron isochronism magnetic field shimming method and system

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0026] Such as figure 1 Shown is a schematic flow chart of a cyclotron isochronous magnetic field shimming method disclosed in an embodiment of the present invention. figure 1 The method shown includes the following steps:

[0027] (1) Carry out finite element modeling for the main magnet of the cyclotron to be shimmed, and calculate N groups of average magnetic field difference distribution c...

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Abstract

The invention discloses a cyclotron isochronism magnetic field shimming method and system. The method includes: firstly, obtaining the radial change amounts of a magnetic pole of a cyclotron in unit edge cutting area magnetic fields at different radius positions through finite element modeling and calculating, and calculating a correlation matrix for representing the cutting vector and the overall magnetic field change amount by employing a plurality of groups of change amounts; and after magnetic measurement of a machined main magnet, reversely calculating the edge radial distribution vector required by cutting according to the isochronous field deviation and the correlation matrix, and machining edges of the magnetic pole by employing a numerical control machine tool after acquisition of a continuous machining coordinate through interpolation. According to the magnetic field shimming method, the radial fringing field effect in a shimming process is considered, the finite element calculating and a practical magnetic measurement result are combined, predictability and high precision are achieved, prediction on a shimming effect of the magnetic field is made based on the correlation matrix, the shimming reliability is further improved, the isochronous field requirement can usually be met after secondary shimming, and the shimming time and the workload are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of design and development of a cyclotron main magnet, and more specifically relates to a cyclotron isochronous magnetic field shim method and system. Background technique [0002] A cyclotron is a device that uses a fixed magnetic field to constrain charged particles to do cyclotron motion, and uses a fixed frequency high-frequency electric field to repeatedly accelerate charged particles circle by circle; it mainly includes ion source, main magnet system, high frequency system, extraction system and vacuum system. Among them, the main magnet system uses the coil current to excite the magnetic poles to generate a magnetic field that confines the charged particles. The isochronous magnetic field distribution along the radius is formed by shimming the coil, or the design and shimming correction of the magnetic pole shape, to meet the cyclone frequency during the particle acceleration process. of stability. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05H7/04H05H13/00
CPCH05H7/04H05H13/005
Inventor 秦斌樊明武杨军刘开锋陈德智李冬余调琴
Owner HUAZHONG UNIV OF SCI & TECH
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