Method for measuring voltage of compact superconductive circular accelerator high frequency resonant cavity

A cyclotron, high-frequency resonant cavity technology, applied in AC/pulse peak measurement and other directions, can solve problems such as difficult to measure accurately, achieve the effect of simple and reliable principle, avoid the change of cavity distribution parameters, and accurate measurement results

Inactive Publication Date: 2017-02-01
HEFEI CAS ION MEDICAL & TECHNICAL DEVICES CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for measuring the voltage of the high-frequency resonant cavity of a compact superconducting cyclotron. problem, it can accurately measure the peak volt

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  • Method for measuring voltage of compact superconductive circular accelerator high frequency resonant cavity
  • Method for measuring voltage of compact superconductive circular accelerator high frequency resonant cavity

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Embodiment Construction

[0026] 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.

[0027] A theoretical basis on which the present invention is based, that is, the relationship between the bremsstrahlung ray energy spectrum and the high-frequency cavity voltage is given by formula (3), specifically as follows:

[0028] When the X-rays produced by bremsstrahlung pass through matter, their intensity decays exponentially (is the total linear absorption coefficient, d is the thickness), but their main energy remains unchanged. The maximum energy of bremsstrahlung in the cavity does not exceed 200keV. When su...

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Abstract

The invention discloses a method for measuring voltage of a compact superconductive circular accelerator high frequency resonant cavity. Based on Bremsstrahlung principles, the method specifically comprises the following steps: Bremsstrahlung X rays sent out from detecting points in the accelerator high frequency cavity are propagated to an outer part of an accelerator via a collimating aperture, full energy peak energy spectra of the above rays can be detected via a detector, cavity peak value voltage in the accelerator high frequency cavity is in a certain corresponding relation with maximum energy of the rays, and peak value voltage of the high frequency cavity can be measured based on maximum value of the detected energy spectra of the rays. The method disclosed in the invention is simple and reliable in principles, high in feasibility and strong in operability; the peak value voltage of the high frequency cavity can be accurately obtained; compared with a conventional electronics measurement method, cavity distribution parameters can be prevented from being affected by a plurality of factors, the peak value voltage of the high frequency cavity can be accurately reflected, and physical beam tuning requirements for the accelerator can be satisfied.

Description

technical field [0001] The invention relates to a method for measuring the voltage of a high-frequency resonant cavity by using the principle of bremsstrahlung, in particular to a method for measuring the voltage of a high-frequency resonant cavity of a medical compact superconducting cyclotron. Background technique [0002] Cyclotrons are widely used in the field of nuclear medicine, especially in the fields of radiopharmaceuticals and tumor treatment. The high-frequency resonant cavity of the proton cyclotron is excited by a high-frequency transmitter, and the working peak voltage is 80kV-150kV. Its function is to form a high-frequency electric field in the gap between the cavity electrode and the ground. Whenever the ion beam passes through the gap, it is accelerated by the harmonic force of the electric field force. The energy gain ΔW obtained after acceleration is proportional to the voltage of the cavity. Therefore, the level and stability of the cavity voltage are ...

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Application Information

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IPC IPC(8): G01R19/04
CPCG01R19/04
Inventor 陈根宋云涛刘广丁开忠
Owner HEFEI CAS ION MEDICAL & TECHNICAL DEVICES CO LTD
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