Cavity exercising method of high-current compact type editcyclotron

A cyclotron, compact technology, used in magnetic resonance accelerators, accelerators, electrical components, etc., can solve the problems of increasing the complexity of the multi-electron multiplication effect, high safety factor, time-consuming and other problems, and achieve a solution to overcome the multi-electron multiplication effect. Effect

Active Publication Date: 2013-01-09
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

The reason is that, firstly, the electron cloud is a nonlinear load, which will affect the matching of the radio frequency system; secondly, if the energy of the electron bombardment is not limited, it will cause the change and failure of the surface material, and even damage such as the accelerator radio frequency ceramic coupling window. key components of
In particular, in a compact cyclotron, due to the small space and complex types of materials, especially in the influence of the fringe field where the electrodes of the radio frequency cavity are

Method used

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  • Cavity exercising method of high-current compact type editcyclotron
  • Cavity exercising method of high-current compact type editcyclotron
  • Cavity exercising method of high-current compact type editcyclotron

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Embodiment

[0031] Taking a medical cyclotron as an example, the power value and time distribution of this method are introduced. The accelerator radio frequency system includes a set of radio frequency cavity with a designed acceleration voltage of 40kV, a resonance frequency of 72.9MHz, a design loss of 10kW, and a 20kW radio frequency power source with a reflection protection of 2kW. During the dummy load test, -16dbm can be pushed to an output of about 2kW, -10dbm can be pushed to an output of about 8.5kW, and -8dbm can be pushed to an output of about 15kW.

[0032] During the exercise of the cavity, the first stage, the pulse exercise stage, takes about 1.5 weeks, the frequency is 72.9MHz, the duty cycle is 0.1%, the repetition period is 1 second, and the driving power of the signal source in the pulse is -10dbm. The recorded multi-electron effect area, for cavity sampling of -46.8db, the range of nonlinear amplitude is 40~70mVpp, 120~200mVpp, 310~580mVpp, 1.2~1.6Vpp, after passing t...

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Abstract

The invention relates to a radio-frequency cavity exercising method of a high-current compact type editcyclotron. The method is mainly characterized in that a cavity is primarily exercised through long-cycle narrow pulses, and the range of a multi-electron multiplication effect generated voltage is judged; according to color changes of the surface of a radio-frequency cavity, a magnetic pole face or a panel of the editcyclotron in the process, a graphite material is brushed at corresponding positions so as to reduce the secondary electron emission coefficient of the region; afterwards, by means of closing a magnetic field of the editcyclotron, all multi-electron effect regions are exercised from low to high in sequence by using a continuous power increase method, when all the multi-electron effect regions are passed, power feed is tuned and maintained for a period of time to accelerate gas outlet on a surface, then, push power is reduced at fixed time interval, and all the multi-electron effect regions are exercised from high to low; and after the processes are repeated ten times, the power supply of the magnetic field is switched on, and the exercise of the radio-frequency cavity can be completed rapidly by using the same method.

Description

technical field [0001] The invention relates to a technique for effectively overcoming the multiple electron multiplication effect in a compact cyclotron, in particular to a method for exercising a cavity of a compact cyclotron with high current. Background technique [0002] Under vacuum environment, especially the vacuum degree is better than 5×10 -5 At mbar, a small amount of radio frequency power is enough to generate electron cloud reciprocating oscillations related to frequency, power and distance on the metal geometric surface with secondary electron emission coefficient higher than 1. The normal operation of the device has a fatal impact. The reason is that, firstly, the electron cloud is a nonlinear load, which will affect the matching of the RF system; secondly, if the energy of the electron bombardment is not limited, it will cause the change and failure of the surface material, and even damage such as the accelerator RF ceramic coupling window. key components. ...

Claims

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Application Information

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IPC IPC(8): H05H13/00
Inventor 张天爵殷治国纪彬李鹏展赵振鲁雷钰
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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