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A method for isochronous magnetic field shim of superconducting cyclotron

A cyclotron and isochronous technology, applied in the direction of magnetic resonance accelerators, accelerators, electrical components, etc., can solve the problems of complex installation of adjustment coils and adjustment rods, poor continuity of shimming magnetic field, and increased engineering difficulty, etc., to achieve shimming High precision, reduced ampere-turns, good continuity

Active Publication Date: 2019-12-24
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

Therefore, most superconducting cyclotrons in the world use adjusting coils and adjusting rods to shimming the magnetic field. The shimming amount of the magnetic field is easy to calculate, but the continuity of the shimming magnetic field is poor, and the shimming accuracy is affected. The installation of the rod is relatively complicated, which increases the difficulty of engineering

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  • A method for isochronous magnetic field shim of superconducting cyclotron
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  • A method for isochronous magnetic field shim of superconducting cyclotron

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Embodiment Construction

[0038] The utility model will be further described in detail below in conjunction with the drawings.

[0039] A superconducting cyclotron isochronous magnetic field shimming method, such as figure 1 with 2 As shown, the magnetic pole is composed of a bottom magnetic pole 1 and a shim layer 2. The shim layer 2 is generally made of electrical pure iron or an iron material with similar magnetic properties, which does not affect the shim or shim method. The shim layer 2 is connected and fixed with the bottom magnetic pole 1 by screws, and can be removed from the bottom magnetic pole 1 and then taken out for processing separately. Each blade of the superconducting cyclotron has two cushion layers 2 on the upper and lower magnetic poles, which can be used to cushion the isochronous magnetic field with a 45-degree chamfer 3 on the left and right sides of each cushion layer 2 whose cutting depth varies with the radius. Supplement, the cutting amount of the chamfer 3 can be equivalent to ...

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Abstract

The invention relates to an isochronism magnetic field shimming method of a superconducting cyclotron. A magnetic pole comprises two parts of a bottom magnetic pole and a shimming layer. The shimminglayer is connected and fixed with the bottom magnetic pole by screws, and can be dismounted and taken out from the bottom magnetic pole. A 45-degree oblique angle tapered cutter is used to perform isochronism magnetic field shimming on a chamfer of a side edge of the shimming layer through three-dimensional motion, working depth of the chamfer being changed with radius, and a chamfer depth curve can be obtained through an integral equation method and a least square method. The method can realize magnetic field isochronism shimming in a superconducting cyclotron, prevents a complicated finite element modeling process, and a shimmed magnetic field has good continuity and high precision. A chamfer processing method can reduce local magnetic field saturation of a magnet, reduce the number of coil ampere-turns and fluctuation of the magnetic field with temperature, and improve stability of the cyclotron for long-term operation.

Description

Technical field [0001] The invention belongs to the field of accelerator magnet shimming, and in particular relates to a superconducting cyclotron isochronous magnetic field shimming method. Background technique [0002] Isochronism is one of the important indicators to measure the performance of cyclotrons. Accelerator with good isochronism, the frequency of particles rotating in the accelerator is consistent with the high-frequency frequency, ensuring that the particles are accelerated at the peak voltage each time they pass through the gap of the high-frequency cavity accelerator, and the particles can reach the extraction position through fewer turns. Beam loss in the accelerator. Generally speaking, the magnetic field cannot satisfy the isochronism at the beginning of the magnet construction of the cyclotron, and the magnetic field needs to be corrected by magnet machining. Commonly used magnetic field shimming methods for normal-temperature magnet cyclotrons include: (1) ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05H13/00H05H7/04
CPCH05H7/04H05H13/005
Inventor 张天爵李明王川崔涛张东昇吕银龙
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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