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Device and method for first harmonic shimming of extraction magnetic channel in superconducting cyclotron

A cyclotron and magnetic channel technology, which is applied in the direction of magnetic resonance accelerators, accelerators, electrical components, etc., can solve problems such as the influence of the main magnetic field distribution, and achieve the effect of overcoming complicated manufacturing processes, long cycle times, and high process requirements

Active Publication Date: 2019-09-13
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

But it also brings problems. The introduction of the magnetic channel makes the passive focusing element generate a magnetic field, which has a more obvious impact on the distribution of the main magnetic field while focusing.

Method used

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  • Device and method for first harmonic shimming of extraction magnetic channel in superconducting cyclotron
  • Device and method for first harmonic shimming of extraction magnetic channel in superconducting cyclotron
  • Device and method for first harmonic shimming of extraction magnetic channel in superconducting cyclotron

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Embodiment Construction

[0035] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] Principle of invention

[0037] 1. Analysis of the influence of the harmonic component of the magnetic channel focusing element on the main magnetic field. Such as Figure 7 Shown is the distribution diagram of each harmonic component generated by the magnetic channel focusing element MC2-6 in the accelerator. The bold line among the three curves is the average curve, and the abscissa is the radius R, that is, the focusing element is from the center of the accelerator to The radial position of the annular thermostatic chamber, the ordinate is the magnetic field intensity, from Figure 7 It can be seen that as the radius R increases, the strength of the harmonic magnetic field also increases, and the strength of the harmonic field will directly affect the main magnetic field of the accelerator. The purpose of th...

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Abstract

The present invention discloses an extraction magnetic channel first harmonic shimming device in a superconductive circular accelerator. The device comprises an electrostatic deflection plate, an extraction magnetic channel and a compensation element which are arranged at the inner wall of a thermostatic chamber of a superconductive circular accelerator along an extraction path. The compensation element is arranged at a proper position at the inner wall of the thermostatic chamber of the superconductive circular accelerator and configured to offset the influence of a harmonic field caused by the extraction magnetic channel on a main magnetic field. The present invention further discloses a method: compensation iron blocks with different radiuses are moved at different angles are moved to perform measurement of the magnetic field to obtain the optimal shimming position. Through change of the shape and the position of the compensation element, an unexpected technical effect is generated,the compensation iron blocks with proper sizes are arranged at the proper positions of the extraction path, the generated offset magnetic field is nearly identical to the curve of a magnetic channelMC2-6 harmonic field, the compensation effect approximately reaches 100%, and therefore, the compensation effect of a harmonic coil is more obvious compared to the prior art.

Description

technical field [0001] The invention belongs to the field of cyclotrons, and in particular relates to a first harmonic shimming device and a shimming method for a magnetic channel of a superconducting cyclotron. Background technique [0002] Cyclotron magnetic field shimming includes isochronous field shimming and harmonic field shimming. Usually, isochronous field shimming is mainly accomplished by changing the shape of the magnetic pole surface without the need for coaxial coils. The shape of the magnetic pole surface is very complex, and the angular width varies with changes in radius. The adjustment of the harmonic field generally depends on the adjustment of the harmonic coil. In the 100MeV cyclotron magnetic field shimming, the shimming of the isochronous field and the shimming of the harmonic field are completed by adding strips installed on both sides of the magnetic pole surface, and the isochronous field shimming is completed by changing the width of the strips. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05H13/00
Inventor 李明李世强崔涛蒋昊李要乾
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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