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Beam extraction method for intermediate energy superconducting proton cyclotron

A cyclotron and proton technology, applied in magnetic resonance accelerators, accelerators, electrical components, etc., can solve problems such as low extraction efficiency, and achieve the effect of reducing beam loss

Active Publication Date: 2016-11-23
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low extraction efficiency in the currently commonly used intermediate-energy proton cyclotron, and to provide a beam extraction method for an intermediate-energy superconducting proton cyclotron that can achieve an extraction efficiency greater than 80%.

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  • Beam extraction method for intermediate energy superconducting proton cyclotron
  • Beam extraction method for intermediate energy superconducting proton cyclotron
  • Beam extraction method for intermediate energy superconducting proton cyclotron

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Embodiment

[0047] A specific example is described below. A superconducting proton cyclotron can draw out a 240MeV proton beam. It adopts a four-blade helical fan structure with a magnetic pole radius of 85cm. According to the magnetic field given by the finite element simulation, the static beam dynamics of the accelerator are calculated, and the accelerator υ is obtained. r The position of =1 is 80.4cm, and the first harmonic is added at the position of r=79cm. Adjusting the phase of the first harmonic, it is found that when the phase of the first harmonic is 135°, the distance between the extracted beam coils is large, and the beam envelope entering the deflection plate after extraction is controllable. A deflector plate is placed in each of the two adjacent magnetic pole peak regions, and the shape and voltage of the deflector plate are designed to allow the beam to pass through with minimal loss. The multi-particle tracking optical matching is performed according to the CYCLONE prog...

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Abstract

The invention relates to a beam extraction method for an intermediate energy superconducting proton cyclotron. The fundamental harmonic procession is introduced in the method to increase the distance of an extraction ring, on the basis that two electrostatic deflection plates extract a beam, a plurality of passive magnetic channels are arranged on a beam track with the combination of the characteristic of the superconducting cyclotron, so that a beam phase space on an extraction path is matched through a mode like beam line design, then the beam loss after deflecting the plate is reduced to the greatest extent, and the final extraction efficiency can be 80% or above.

Description

technical field [0001] The invention belongs to the cyclotron design technology, in particular to a beam extraction method of a medium-energy superconducting proton cyclotron. Background technique [0002] The 100-300MeV medium-energy superconducting proton cyclotron has a wide range of applications in the fields of nuclear medicine, aerospace and military industry, and basic research in nuclear physics. Compared with normal-temperature proton cyclotrons, superconducting proton cyclotrons have the advantages of compact structure and low operating power loss. Among them, the beam extraction efficiency is one of the core indicators of this type of accelerator. The particles lost in the extraction process hit the accelerator magnet, high-frequency cavity and other components, which will affect the service life and operation stability of the components. At the same time, the activation of the accelerator will keep the accelerator at a high radiation dose level, which is not con...

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Application Information

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IPC IPC(8): H05H7/00H05H13/00
CPCH05H7/001H05H13/00H05H2007/002
Inventor 李明张天爵崔涛杨建俊王川
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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