Medical superconducting cyclotron resonant cavity capacitor tuning device and method

A cyclotron, capacitance tuning technology, applied in magnetic resonance accelerators, electrical components, accelerators, etc., can solve the problems of acceleration, cavity resonance frequency deviation, and theoretical design value discrepancies, so as to reduce the possibility of ignition and avoid cavity The effect of detuning the body and the stable operation of the cavity

Active Publication Date: 2017-03-22
HEFEI CAS ION MEDICAL & TECHNICAL DEVICES CO LTD
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Problems solved by technology

However, due to the thermal effect of the radio frequency system when the accelerator is in normal operation, there is a large deviation in the resonant frequency of the cavity before and after

Method used

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  • Medical superconducting cyclotron resonant cavity capacitor tuning device and method
  • Medical superconducting cyclotron resonant cavity capacitor tuning device and method
  • Medical superconducting cyclotron resonant cavity capacitor tuning device and method

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Embodiment Construction

[0024] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0025] Medical superconducting cyclotron resonant cavity capacitance tuning device, the left and right sides of the tuning device adopt a completely symmetrical structure, single cavity structure see figure 1 , including a Dee board 4 arranged opposite to the end, and a tuning capacitor board 5 is placed at the rear of the Dee board 4; an inner rod 3 is vertically connected to the upper and lower sides of the Dee board 4;

[0026] Among them, the inner rod 3, the Dee plate 4 and the tuning structure are all arranged in a si...

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Abstract

The invention discloses a medical superconducting cyclotron resonant cavity capacitor tuning device and method. The device comprises a cavity and two sets of DEE plates arranged end to end in the cavity. Upper and lower sides of each set of DEE plates are respectively vertically connected with an inner rod. A tuning structure which moves relative to an end face of each Dee plate is arranged in the cavity. The tuning structure consists of a tuning capacitor plate and a moving rod. The tuning method comprises the steps that a vector network analyzer is used to adjust the resonant frequency; the reflection coefficient S11 is measured; the frequency point f1 corresponding to the minimum S11 is observed; f1 and the resonant frequency f0 are compared; if f1 is greater than f0, the capacitor plate is slowly moved to the left, otherwise the capacitor plate is slowly moved to the right; the change of the frequency point corresponding to the minimum S11 is observed; and if f1 is equal to f0, the moving of the capacitor plate is stopped to reach the frequency point of the working resonant cavity. According to the invention, automatically cavity frequency adjusting is realized; and the equivalent capacitance of a resonant circuit is changed by automatically controlling the capacitor plate to move to the right and left and tune the resonant cavity.

Description

technical field [0001] The invention belongs to the technical field of superconducting cyclotrons, and relates to a capacitance tuning device and method for a resonant cavity of a medical superconducting cyclotron. Background technique [0002] Cyclotrons are not only widely used in basic research fields such as nuclear physics, particle and solid state physics, but also play an important role in medical PET diagnosis, proton therapy, isotope production and industrial irradiation. It is imperative to build a medical cyclotron with independent intellectual property rights and put it into operation smoothly. [0003] When designing the cavity of a medical superconducting cyclotron, the resonant frequency should first be met. Because the operating frequency of the accelerator is single, the frequency selectivity of the cavity is required to be steep. However, in order to match the operating frequency of the magnet, the frequency of the cavity is expected to be A certain range ...

Claims

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Application Information

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IPC IPC(8): H05H13/00H05H7/20
CPCH05H7/20H05H13/005
Inventor 宋云涛陈根巢楚颉丁开忠
Owner HEFEI CAS ION MEDICAL & TECHNICAL DEVICES CO LTD
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