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Matching method of strong magnetic field and high frequency frequency conversion in synchrocyclotron

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

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

The above points are difficult to achieve by the existing flat-head magnetic pole synchrocyclotron

Method used

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  • Matching method of strong magnetic field and high frequency frequency conversion in synchrocyclotron
  • Matching method of strong magnetic field and high frequency frequency conversion in synchrocyclotron
  • Matching method of strong magnetic field and high frequency frequency conversion in synchrocyclotron

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Embodiment Construction

[0051] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0052] Taking a medical superconducting synchrocyclotron as an example, the implementation process of high-frequency modulation frequency synchronization matching technology under the condition of strong magnetic field of synchrocyclotron is introduced.

[0053] Such as figure 1As shown, the energy of the proton beam extracted by the superconducting synchrocyclotron is 230 MeV, the main magnet pole 1 adopts a circumferential magnet with variable air gap, the magnetic pole surface 2 is a curved structure, and the two magnetic poles 1 are arranged symmetrically. Insert a Dee board 3 in the middle plane of the gap between the two magnetic poles 1, and a rotating capacitor is arranged at the rear end of the Dee board 3; Shaft connection; the stator 6, the rotor 7 and the Dee plate 3 are all sealed and arranged in the same sealed cavity as the main magnet, and th...

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Abstract

The invention discloses a synchrocyclotron and a method for matching a high-intensity magnetic field thereof with a high-frequency frequency modulation curve, belongs to the field of particle cyclotron acceleration, and solves the problem that the magnetic field distribution of a flat magnetic pole does not match the high-frequency frequency modulation curve. The synchrocyclotron mainly includes amain magnet. The two magnetic pole faces with opposite magnetic poles of the main magnet are curved surfaces. The two magnetic poles are disposed centrally symmetrically. The method, based on the fine adjustment of an ideal frequency curve by the compensation of a high-intensity magnetic field and the large-range modulation of the high-frequency frequency curve by a rotary capacitor, repeatedly performs iteration to realize the optimum matching of the high-intensity magnetic field and the high-frequency frequency modulation curve, thereby ensuring the stability of the longitudinal phase spaceacceptance during an acceleration process, minimizing the beam loss in the synchrocyclotron and achieving a low level of excitation.

Description

technical field [0001] The invention belongs to the field of synchronous cyclotrons, and in particular relates to a synchronous cyclotron and a method for matching strong magnetic fields and high-frequency frequencies thereof. Background technique [0002] Synchrotron, also known as frequency-modulated cyclotron or phase-stable accelerator, is an accelerator developed to overcome the limitation of the limit energy of cyclotron. In order to adapt to the influence of the theory of relativity, the cyclotron frequency decreases continuously during the particle acceleration process of the synchrocyclotron, and the resonant frequency of the high-frequency cavity is required to decrease with time to ensure that the particles are continuously accelerated in a suitable phase. After the beam is extracted, the frequency of the cavity is quickly returned to the initial acceleration frequency, and the acceleration of the next beam continues. Previous synchrocyclotrons were large in size...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05H13/02H05H7/04
Inventor 张天爵李明李鹏展纪彬尹蒙王川
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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