High-intensity magnetic field and high-frequency field coupled test method and superconducting cyclotron based on method

A technology of cyclotron and high-frequency field, applied in the direction of magnetic resonance accelerator, electromagnetic field characteristics, instruments, etc., can solve the problems of miniaturization and high dose, incompatibility, and consideration

Active Publication Date: 2020-12-18
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you separate from the overall environment to test the coupling degree of a certain type, since the other types of coupling factors in the entire machine environment are not taken into account during the test, once the test results of this type are taken into the entire machine environment, it will appear unsuitable, is invalid
[0022] The problem existing in the existing technology is: it only tests a certain magnetic field variable, or a certain electric field variable, or a certain type of coupling degree alone. Due to the lack of an overall test or a coordinated test method, the problem of miniaturization and high dose cannot be solved in the end.

Method used

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  • High-intensity magnetic field and high-frequency field coupled test method and superconducting cyclotron based on method
  • High-intensity magnetic field and high-frequency field coupled test method and superconducting cyclotron based on method
  • High-intensity magnetic field and high-frequency field coupled test method and superconducting cyclotron based on method

Examples

Experimental program
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Effect test

Embodiment 1

[0143] Example 1: Use high-precision nuclear magnetic resonance (NMR) devices and Hall effect devices to measure the magnitude of the magnetic field at the center of the accelerator: according to the size of the nuclear magnetic resonance (NMR) device or Hall effect devices, design a special fixture and fix the instrument probe From the position to the center of the accelerator, the positioning is accurate within 0.1mm, and the magnetic field is measured within 8 hours to ensure that the magnetic field is stable at 10 -5 , and confirm that the magnetic induction range is within the range of 2.0T~2.5T; such a magnetic field range not only ensures that the overall scale of the accelerator is small, but also leaves enough space for the high-frequency cavity, and the risk of sparking is controlled within a controllable range.

[0144] With the help of nuclear magnetic resonance (NMR) equipment and the use of induction equipment, the magnetic field distribution is drawn; the X-ray...

Embodiment 2

[0145] Embodiment 2: Fourfold symmetry test of magnetic field: nuclear magnetic resonance (NMR) device and induction device are used for magnetic field measurement, and a small induction coil is designed, the size of which can accurately reflect the magnetic field at the center point of the coil volume; fixed angle, the coil is along the radial direction Movement, the radial magnetic field distribution is obtained through the change of the induced electromotive force; the magnetic field at each angle can be obtained by moving the induction coil from 0 to 360 degrees; the drawing of the magnetic field distribution is completed according to the measurement data, comparing 0-90 degrees, 90-180 degrees degrees, 180-270 degrees, and 270-360 degrees in the four angle ranges of the magnetic field. By comparing the difference between the four, the four-fold symmetry of the magnetic field can be measured.

[0146] Electric field quadruple symmetry test: By measuring the maximum energy o...

Embodiment 3

[0148] Embodiment 3: measure the frequency w of the high-frequency field by a frequency measuring device rf , confirm that the frequency range is 60~90MHz; according to the magnetic field distribution measured by the above induction coil, input it into the beam dynamics calculation software to obtain the cyclotron frequency of the particle, so that the harmonic number h=w rf / w 0 , h must be equal to 2 (the error is within 0.5 ten-thousandths), so as to ensure that the particles are accelerated close to the peak voltage when passing through each high-frequency cavity.

[0149] Step 2. Matching setup test to balance high-frequency voltage symmetry and axial focus;

[0150] The specific process is:

[0151] Test the axial focus Vz after reducing the helicity of the magnetic pole, and control the axial focus Vz in the range of 0.15~0.20;

[0152] The X-ray detector is used to measure the electric field distribution, and the voltage symmetry of the high-frequency field at t...

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Abstract

The invention discloses a high-intensity magnetic field and high-frequency field coupled test method and a superconducting cyclotron based on the method, which are used in the technical field of measurement of electromagnetic field characteristics and electric field distribution of a high-current proton cyclotron. The method comprise the following steps of: carrying out matching setting test on overall parameters of a high-intensity magnetic field and a high-frequency field; balancing matching setting test of high-frequency voltage symmetry and axial focusing; carrying out matching setting test between a magnetic field and high-frequency system and the working path; carrying out matching setting test between an ion source and a central area high-frequency cavity; and carrying out matchingsetting test between the central area high-frequency cavity and a main magnet core column. The cyclotron is a miniaturized high-dose medium-energy superconducting cyclotron, and comprises a matching structure between a superconducting strong magnetic field system and the high-frequency system, a matching structure between a main vacuum system and the ion source and a matching structure between thesuperconducting strong magnetic field system and the high-frequency system, and a beam matching structure in the whole process from the ion source to a central region to an acceleration region to a leading-out region. According to the invention, the cooperation technology of each link is adopted, and the new problems of miniaturization and high dosage are solved from the overall effect.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic field characteristics and electric field distribution measurement of a high-current proton cyclotron, and in particular relates to a high-frequency field coupling test method of a strong magnetic field and a superconducting cyclotron based on the method. Background technique [0002] The cyclotron is a device that makes use of the magnetic field and the electric field to make the charged particles do a cyclotron motion, and is repeatedly accelerated by the high-frequency electric field during the motion. It is widely used in various industries. Compared with other types of accelerators, the cyclotron has the advantage of continuous beam, which can provide higher proton beam intensity. According to the statistics of the International Particle Therapy Cooperative Group (PTCOG), there are more than 100 sets of proton therapy systems in use and under construction in the world, and more than 73...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/08H05H7/04H05H13/00
CPCG01R29/0871H05H7/04H05H13/005
Inventor 张天爵王川李明崔涛殷治国纪彬邢建升吕银龙张素平葛涛贾先禄卢晓通尹蒙温立鹏管锋平蔡红茹刘景源王飞朱晓锋
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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